CVE-2026-5121

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-30. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — Patch released this week
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation1.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.4%
EPSS %ILE
72nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 30, 2026

Last Modified

October 14, 2026

Advisory Details (18)

Auto-updated Oct 15, 2026
Patch available. Sources: redhat.
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:16008
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:15087
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:14937
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:14773
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:13812
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:12274
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:12071
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:11768
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:10097
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:10065
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:8873
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:8867
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:8866
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:8864
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:8534
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.2 Advanced Update Support.

https://access.redhat.com/errata/RHSA-2026:8521
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 7 Extended Lifecycle Support.

https://access.redhat.com/errata/RHSA-2026:8517
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:8510

Vendor Advisories for CVE-2026-5121(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatcert-manager/jetstack-cert-manager-rhel9:17913710692026-10-13redhat
redhatcert-manager/cert-manager-istio-csr-rhel9:17914597592026-10-13redhat
redhatcert-manager/jetstack-cert-manager-rhel9:17914597112026-10-13redhat
redhatcert-manager/cert-manager-operator-rhel9:17890290762026-10-13redhat
redhatcert-manager/cert-manager-operator-rhel9:17917882872026-10-13redhat
redhatcert-manager/cert-manager-trust-manager-rhel9:17905985932026-09-28redhat
redhatrhaiis/model-opt-cuda-rhel9:17806819842026-06-10redhat
redhatopenshift/ose-rhel-coreos-9:413.92.202605271328-02026-06-04redhat
redhatopenshift/ose-rhel-coreos-9:4.19.9.6.202605201155-02026-05-27redhat
redhatopenshift/ose-rhel-coreos-9:417.94.202605112123-02026-05-20redhat
redhatrhaiis/vllm-cuda-rhel9:17792236542026-05-20redhat
redhatrhaiis/vllm-rocm-rhel9:17792236512026-05-20redhat
redhatopenshift/ose-rhel-coreos-9:415.92.202605060220-02026-05-13redhat
redhatopenshift/ose-rhel-coreos-9:414.92.202605060243-02026-05-13redhat
redhatrhaiis/vllm-spyre-rhel9:17782445462026-05-12redhat
redhatrhaiis/vllm-rocm-rhel9:17782445312026-05-11redhat
redhatrhaiis/model-opt-cuda-rhel9:17782445592026-05-11redhat
redhatrhaiis/vllm-cuda-rhel9:17782746662026-05-11redhat
redhatopenshift/ose-rhel-coreos-9:418.94.202604240015-02026-05-11redhat
redhatopenshift/ose-rhel-coreos-8:412.86.202604281506-02026-05-08redhat
redhatdiscovery/discovery-ui-rhel9:17781567562026-05-07redhat
redhatrhpam-7/rhpam-smartrouter-rhel8:7.13.5-4.17773257082026-05-05redhat
redhatopenshift/ose-rhel-coreos-9:416.94.202604211449-02026-04-30redhat
redhatrhui5/rhua-tp-rhel9:17774595042026-04-29redhat
redhatrhui5/rhua-rhel9:17768688422026-04-23redhat
redhatlibarchive-0:3.3.3-1.el8_4.22026-04-22redhat
redhatinsights-proxy/insights-proxy-container-rhel9:17768689612026-04-22redhat
redhatlibarchive-0:3.5.3-7.el9_6.12026-04-20redhat
redhatlibarchive-main-3.8.7-1.hum12026-04-20redhat
redhatlibarchive-0:3.3.3-6.el8_6.12026-04-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libarchive3.4.3-2, 3.4.3-2+deb11u1, 3.4.3-2+deb11u2, 3.4.3-2+deb11u3
  • every version up to 3.4.3-2+deb11u4: fixed in 3.4.3-2+deb11u4
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libarchive3.6.2-1, 3.6.2-1+deb12u1, 3.6.2-1+deb12u2, 3.6.2-1+deb12u3
  • every version up to 3.6.2-1+deb12u4: fixed in 3.6.2-1+deb12u4
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libarchive3.7.4-4
  • every version up to 3.7.4-4+deb13u1: fixed in 3.7.4-4+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libarchive3.7.4-4, 3.8.4-1, 3.8.5-1, 3.8.6-1
  • every version up to 3.8.7-1: fixed in 3.8.7-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 32× in last 7d / 58× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 324 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 224 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  2. 2026-10-14 20:28 UTCEG score recompute
  3. 2026-10-14 20:28 UTCVendor advisory
  4. 2026-10-14 20:27 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-14 20:24 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  6. 2026-10-14 19:38 UTCEG score recompute
  7. 2026-10-14 19:38 UTCVendor advisory
  8. 2026-10-14 19:38 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-10-14 19:34 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  10. 2026-10-14 16:33 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  11. 2026-10-14 04:26 UTCEG score recompute
  12. 2026-10-14 04:26 UTCVendor advisory
  13. 2026-10-14 04:26 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-14 04:25 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  15. 2026-10-14 03:37 UTCEG score recompute
  16. 2026-10-14 03:37 UTCVendor advisory
  17. 2026-10-14 03:36 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-14 03:34 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  19. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  20. 2026-10-13 07:49 UTCEG score recompute
  21. 2026-10-13 07:49 UTCVendor advisory
  22. 2026-10-13 07:49 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  24. 2026-10-12 15:59 UTCEG score recompute
  25. 2026-10-12 07:13 UTCVendor advisory
Show 75 more
  1. 2026-10-12 07:13 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-10-11 19:42 UTCEG score recompute
  3. 2026-10-11 16:56 UTCEG score recompute
  4. 2026-10-11 14:20 UTCEG score recompute
  5. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  6. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  7. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  8. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  9. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  10. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  11. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  12. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  13. 2026-10-02 17:56 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  14. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  15. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
  16. 2026-09-29 01:21 UTCEG score recompute
  17. 2026-09-29 01:21 UTCVendor advisory
  18. 2026-09-29 01:21 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-09-29 01:20 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  20. 2026-09-29 00:57 UTCEG score recompute
  21. 2026-09-29 00:57 UTCVendor advisory
  22. 2026-09-29 00:56 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-09-29 00:56 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  24. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  26. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  27. 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  28. 2026-09-23 17:54 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  29. 2026-09-20 20:16 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  30. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  31. 2026-09-17 19:31 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  32. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  33. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  34. 2026-09-15 03:11 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  35. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  36. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  37. 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  38. 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  39. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  40. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  41. 2026-09-04 05:07 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  42. 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  43. 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  44. 2026-09-01 09:34 UTCEG score recompute
  45. 2026-09-01 09:34 UTCVendor advisory
  46. 2026-09-01 09:34 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  47. 2026-09-01 09:30 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  48. 2026-09-01 08:57 UTCEG score recompute
  49. 2026-09-01 08:57 UTCVendor advisory
  50. 2026-09-01 08:56 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  51. 2026-09-01 08:52 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  52. 2026-09-01 04:40 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  53. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  54. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  55. 2026-08-28 21:42 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  56. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  57. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  58. 2026-08-25 13:49 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  59. 2026-08-23 00:19 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  60. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  61. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  62. 2026-08-19 17:04 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  63. 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  64. 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  65. 2026-08-16 09:49 UTCEG score recompute
  66. 2026-08-16 09:49 UTCVendor advisory
  67. 2026-08-16 09:49 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  68. 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.1% · 61st percentile
  69. 2026-08-14 23:29 UTCVendor advisory
  70. 2026-08-14 23:29 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-08-14 19:10 UTCVendor advisory
  72. 2026-08-14 19:10 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  73. 2026-08-14 14:50 UTCVendor advisory
  74. 2026-08-14 14:50 UTCGHSA enrichmentGHSA-2vwv-vqpv-v8vc · GitHub severity CRITICAL · GitHub CVSS 9.8
  75. 2026-08-14 10:31 UTCVendor advisory

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-5121?
CVE-2026-5121 is a critical-severity vulnerability; its CVE record was published on March 30, 2026. A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for…
When was CVE-2026-5121 made public?
CVE-2026-5121 was made public on March 30, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on March 30, 2026. EchelonGraph's copy of the record carries a last-modified date of October 14, 2026; the record at its source may have been updated since.
Is CVE-2026-5121 actively exploited?
CVE-2026-5121 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% probability of exploitation in the next 30 days (72nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-5121?
CVE-2026-5121 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-5121?
A fix for CVE-2026-5121 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-5121 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-5121

Explore →

Is Your Infrastructure Affected by CVE-2026-5121?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs