CVE-2026-42012

HIGHPre-NVD 7.17.1
EchelonGraph scoreMEDIUM confidence

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

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. A secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — Patch released this week

Also known asEUVD-2026-32010 (ENISA EUVD) · GHSA-7hhj-8fwv-m5hc (GitHub Security Advisories)Source: ENISA EUVD

7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity71% × 45%
Impact severity (EG Severity): CVSS 7.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.1): severity, escalated by confirmed exploitation. This CVE's 7.1 is its impact severity (EG Severity), not escalated.

EG Severity
7.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

May 26, 2026

Last Modified

October 30, 2026

Advisory Details (5)

Auto-updated Jun 11, 2026
Patch available. Sources: redhat.
Red Hat

2467441 – (CVE-2026-42012) CVE-2026-42012 gnutls: gnutls: Certificate validation bypass due to improper handling of URI and SRV SANs

https://bugzilla.redhat.com/show_bug.cgi?id=2467441
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-42012
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:20613
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:20612
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:20611

Patch Availability(29)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibgnutls30t64 (3.8.12-2ubuntu1.1) @ resolute2026-10-30ubuntu
ubuntulibgnutlsxx28 (3.6.13-2ubuntu1.12+esm3) @ focal2026-10-30ubuntu
redhatopenshift/ose-rhel-coreos-9:4.20.9.6.202610242033-02026-10-27redhat
redhatopenshift/ose-rhel-coreos-9:4.22.9.8.202610241758-02026-10-27redhat
redhatopenshift/ose-rhel-coreos-9:4.21.9.6.202610241345-02026-10-27redhat
redhatcert-manager/cert-manager-operator-bundle:17919662592026-10-14redhat
redhatcert-manager/cert-manager-operator-bundle:17919704842026-10-14redhat
redhatcert-manager/cert-manager-istio-csr-rhel9:17914597592026-10-13redhat
redhatcert-manager/cert-manager-operator-rhel9:17917882872026-10-13redhat
redhatcert-manager/jetstack-cert-manager-rhel9:17914597112026-10-13redhat
redhatcert-manager/jetstack-cert-manager-rhel9:17913710692026-10-13redhat
redhatcert-manager/cert-manager-operator-rhel9:17890290762026-10-13redhat
redhatrhai/base-image-neuron-rhel9:17907035422026-10-01redhat
redhatcert-manager/cert-manager-trust-manager-rhel9:17905985932026-09-28redhat
redhatrhui5/rhua-tp-rhel9:17872412602026-08-24redhat
redhatgnutls-0:3.3.29-9.el7_9.22026-07-22redhat
redhatgnutls-0:3.7.6-21.el9_2.72026-07-20redhat
redhatlibtasn1-0:4.13-3.el8_6.22026-06-29redhat
redhatlibtasn1-0:4.13-3.el8_4.12026-06-29redhat
redhatlibtasn1-0:4.13-4.el8_8.12026-06-29redhat
redhatgnutls-0:3.8.3-4.el9_4.62026-06-29redhat
redhatgnutls-0:3.8.3-6.el9_6.42026-06-25redhat
redhatdiscovery/discovery-ui-rhel9:17821669522026-06-24redhat
redhatgnutls-0:3.8.9-9.el10_0.192026-06-16redhat
redhatrhui5/rhua-rhel9:17815257392026-06-16redhat
redhatgnutls-0:3.8.10-4.el10_22026-05-26redhat
redhatgnutls-0:3.6.16-8.el8_10.62026-05-26redhat
redhatgnutls-0:3.8.10-4.el9_82026-05-26redhat
redhatgnutls-main-3.8.13-1.hum12026-05-02redhat

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

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.7.1-5 ... 3.7.1-5+deb11u9 (10 versions)
  • every version up to 3.7.1-5+deb11u10: fixed in 3.7.1-5+deb11u10
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.7.9-2 ... 3.7.9-2+deb12u6 (7 versions)
  • every version up to 3.7.9-2+deb12u7: fixed in 3.7.9-2+deb12u7
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.8.9-3, 3.8.9-3+deb13u1, 3.8.9-3+deb13u2, 3.8.9-3+deb13u3
  • every version up to 3.8.9-3+deb13u4: fixed in 3.8.9-3+deb13u4
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.8.10-1 ... 3.8.9-3 (11 versions)
  • every version up to 3.8.13-1: fixed in 3.8.13-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(8)

Data Freshness Timeline

(refreshed 20× in last 7d / 74× 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 429 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 329 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  2. 2026-10-30 07:26 UTCEG score recompute
  3. 2026-10-30 07:26 UTCVendor advisory
  4. 2026-10-30 07:26 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  5. 2026-10-30 06:46 UTCEG score recompute
  6. 2026-10-30 06:46 UTCVendor advisory
  7. 2026-10-30 06:46 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  8. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-10-29 06:26 UTCEG score recompute
  10. 2026-10-29 06:26 UTCVendor advisory
  11. 2026-10-29 06:26 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  12. 2026-10-29 05:58 UTCEG score recompute
  13. 2026-10-29 05:58 UTCVendor advisory
  14. 2026-10-29 05:58 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  15. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  17. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-10-25 14:29 UTCEG score recompute
  20. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-10-22 10:28 UTCEG score recompute
  24. 2026-10-22 10:28 UTCVendor advisory
  25. 2026-10-22 10:28 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
Show 75 more
  1. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-18 03:41 UTCEG score recompute
  6. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-10-14 20:33 UTCEG score recompute
  10. 2026-10-14 20:33 UTCVendor advisory
  11. 2026-10-14 20:33 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  12. 2026-10-14 19:38 UTCEG score recompute
  13. 2026-10-14 19:38 UTCVendor advisory
  14. 2026-10-14 19:38 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  15. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-14 04:28 UTCEG score recompute
  17. 2026-10-14 04:28 UTCVendor advisory
  18. 2026-10-14 04:28 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  19. 2026-10-14 03:36 UTCEG score recompute
  20. 2026-10-14 03:36 UTCVendor advisory
  21. 2026-10-14 03:36 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  22. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-10-13 01:27 UTCEG score recompute
  24. 2026-10-13 01:27 UTCVendor advisory
  25. 2026-10-13 01:27 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  26. 2026-10-13 00:54 UTCEG score recompute
  27. 2026-10-13 00:54 UTCVendor advisory
  28. 2026-10-13 00:54 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  29. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  30. 2026-10-12 16:07 UTCEG score recompute
  31. 2026-10-11 19:49 UTCEG score recompute
  32. 2026-10-11 17:03 UTCEG score recompute
  33. 2026-10-11 14:29 UTCEG score recompute
  34. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  35. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  36. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  37. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  38. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  39. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  40. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  41. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  42. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  43. 2026-10-02 03:30 UTCEG score recompute
  44. 2026-10-02 03:30 UTCVendor advisory
  45. 2026-10-02 03:30 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  46. 2026-10-02 02:40 UTCEG score recompute
  47. 2026-10-02 02:40 UTCVendor advisory
  48. 2026-10-02 02:40 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  49. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  50. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  51. 2026-09-29 01:20 UTCEG score recompute
  52. 2026-09-29 01:20 UTCVendor advisory
  53. 2026-09-29 01:20 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  54. 2026-09-29 00:56 UTCEG score recompute
  55. 2026-09-29 00:56 UTCVendor advisory
  56. 2026-09-29 00:56 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  57. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  58. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  59. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  60. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  61. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  62. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  63. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  64. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  65. 2026-09-14 09:36 UTCEG score recompute
  66. 2026-09-14 09:36 UTCVendor advisory
  67. 2026-09-14 09:36 UTCGHSA enrichmentGHSA-7hhj-8fwv-m5hc · GitHub severity HIGH · GitHub CVSS 7.1
  68. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  69. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  70. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  71. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  72. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  73. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  74. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  75. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile

Frequently asked(5)

What is CVE-2026-42012?
CVE-2026-42012 is a high-severity vulnerability; its CVE record was published on May 26, 2026. A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall…
When was CVE-2026-42012 made public?
CVE-2026-42012 was made public on April 29, 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 May 26, 2026. EchelonGraph's copy of the record carries a last-modified date of October 30, 2026; the record at its source may have been updated since.
Is CVE-2026-42012 actively exploited?
CVE-2026-42012 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42012?
CVE-2026-42012 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-42012?
A fix for CVE-2026-42012 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42012 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-2026-42012

Explore →

Is Your Infrastructure Affected by CVE-2026-42012?

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