CVE-2026-42508

CRITICALPre-NVD 9.19.1
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.1 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.7% (50th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from CISA-ADP (Vulnrichment) CVSS v3.1
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS
Trending — 3 sources updated this week
9.1EG
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: 0.7%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

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)
Severity91% × 45%
The EG Score, 9.1 of 10.
Exploitation0.7% × 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
0.7%
EPSS %ILE
50th
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

May 22, 2026

Last Modified

September 15, 2026

Advisory Details (10)

Auto-updated Sep 15, 2026
Patch available. Sources: redhat.
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:36648
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:35833
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:26547
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:26546
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:23264
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:23262
Web page

GO-2026-5021 - Go Packages

https://pkg.go.dev/vuln/GO-2026-5021
Web page
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
Web page

x/crypto/ssh/knownhosts: failure to enforce `@revoked` status · Issue #79568 · golang/go · GitHub

https://go.dev/issue/79568
Web page
https://go.dev/cl/781220

Vendor Advisories for CVE-2026-42508(20)

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

Patch Availability(27)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhoai/odh-data-science-pipelines-argo-workflowcontroller-rhel9:17901301732026-09-30redhat
redhatopenshift-logging/cluster-logging-rhel9-operator:17896591662026-09-23redhat
redhatquay/quay-rhel8:17885938432026-09-22redhat
redhatpodman-5:5.4.0-22.el9_6.52026-09-14redhat
redhatopenshift-logging/cluster-logging-rhel9-operator:17884395052026-09-10redhat
redhatoadp/oadp-mustgather-rhel9:17888598962026-09-09redhat
redhatrhoai/odh-data-science-pipelines-argo-workflowcontroller-rhel9:17881810542026-09-08redhat
redhatcluster-observability-operator/cluster-observability-rhel9-operator:17875936372026-08-31redhat
redhatrhoai/odh-data-science-pipelines-argo-workflowcontroller-rhel9:17870019482026-08-27redhat
redhatoadp/oadp-mustgather-rhel9:17869462942026-08-25redhat
redhatmulticluster-engine/hypershift-addon-rhel9-operator:17869120062026-08-19redhat
redhatrhacm2/volsync-rhel9:17864566582026-08-12redhat
redhatquay/quay-rhel9:17861819812026-08-12redhat
redhatopenshift-gitops-1/argocd-rhel8:17851492602026-08-10redhat
redhatopenshift-gitops-1/argocd-rhel9:17852113462026-08-10redhat
redhatoadp/oadp-mustgather-rhel9:17851773592026-08-06redhat
redhatcontainer-tools:rhel8-8060020260803064027.ad008a3a2026-08-06redhat
redhatconforma-cli-stack-v1-4-1.4.32026-08-05redhat
redhatcontainer-tools:rhel8-8080020260721142025.63b345852026-08-04redhat
redhatmulticluster-engine/cluster-image-set-controller-rhel9:17846467862026-07-29redhat
redhatrhacm2/multicluster-operators-subscription-rhel9:17847401432026-07-29redhat
redhatmulticluster-engine/cluster-image-set-controller-rhel9:17846460262026-07-28redhat
redhatoadp/oadp-velero-rhel9:17840588222026-07-22redhat
redhatquay/quay-rhel8:17843519662026-07-21redhat
redhatquay/quay-rhel8:17843539042026-07-21redhat
redhatquay/quay-rhel8:17837518652026-07-20redhat
redhatopenshift-builds/openshift-builds-waiters-rhel9:17836121192026-07-16redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
golang-go.crypto1:0.0~git20201221.eec23a3-1 ... 1:0.53.0-1 (40 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
golang-go.crypto1:0.10.0-1 ... 1:0.56.0-1 (36 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
golang-go.crypto1:0.25.0-1 ... 1:0.56.0-1 (21 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
golang-go.crypto1:0.25.0-1 ... 1:0.52.0-1~bpo13+1 (16 versions)
  • every version up to 1:0.52.0-1: fixed in 1:0.52.0-1
—
Go(1)
PackageVulnerable rangeFix by version rangeDependents
golang.org/x/crypto—
  • every version up to 0.52.0: fixed in 0.52.0
—

Weakness Classification(1)

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

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 16× in last 7d / 34× 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 430 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 330 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  2. 2026-10-14 09:18 UTCEG score recompute
  3. 2026-10-14 09:18 UTCVendor advisory
  4. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  5. 2026-10-13 06:34 UTCEG score recompute
  6. 2026-10-13 06:34 UTCVendor advisory
  7. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  8. 2026-10-12 16:07 UTCEG score recompute
  9. 2026-10-12 07:58 UTCVendor advisory
  10. 2026-10-11 19:49 UTCEG score recompute
  11. 2026-10-11 17:03 UTCEG score recompute
  12. 2026-10-11 14:29 UTCEG score recompute
  13. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  14. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  15. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  16. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  18. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  19. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  20. 2026-10-05 04:43 UTCOSV refresh
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  22. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 49th percentile
Show 75 more
  1. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  2. 2026-09-23 17:53 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  3. 2026-09-18 19:28 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  4. 2026-09-17 19:31 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  5. 2026-09-16 14:08 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  6. 2026-09-16 05:15 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  7. 2026-09-15 12:30 UTCVendor advisory
  8. 2026-09-15 12:13 UTCEG score recompute
  9. 2026-09-15 12:13 UTCVendor advisory
  10. 2026-09-13 16:47 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  11. 2026-09-12 15:01 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  12. 2026-09-11 14:53 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  13. 2026-09-11 13:24 UTCVendor advisory
  14. 2026-09-11 12:21 UTCEG score recompute
  15. 2026-09-11 12:21 UTCVendor advisory
  16. 2026-09-11 09:37 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  17. 2026-09-10 13:38 UTCVendor advisory
  18. 2026-09-10 12:26 UTCEG score recompute
  19. 2026-09-10 12:26 UTCVendor advisory
  20. 2026-09-10 09:34 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  21. 2026-09-09 13:41 UTCVendor advisory
  22. 2026-09-09 12:38 UTCEG score recompute
  23. 2026-09-09 12:38 UTCVendor advisory
  24. 2026-09-08 22:00 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  25. 2026-09-07 16:01 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  26. 2026-09-07 13:50 UTCVendor advisory
  27. 2026-09-07 12:38 UTCEG score recompute
  28. 2026-09-07 12:38 UTCVendor advisory
  29. 2026-09-06 13:47 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  30. 2026-09-04 13:29 UTCVendor advisory
  31. 2026-09-04 12:21 UTCEG score recompute
  32. 2026-09-04 12:21 UTCVendor advisory
  33. 2026-09-04 05:06 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  34. 2026-09-02 14:12 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  35. 2026-09-02 13:41 UTCVendor advisory
  36. 2026-09-02 12:38 UTCEG score recompute
  37. 2026-09-02 12:38 UTCVendor advisory
  38. 2026-09-01 13:54 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  39. 2026-09-01 13:44 UTCVendor advisory
  40. 2026-09-01 12:21 UTCEG score recompute
  41. 2026-09-01 12:21 UTCVendor advisory
  42. 2026-08-31 13:33 UTCVendor advisory
  43. 2026-08-31 12:30 UTCEG score recompute
  44. 2026-08-31 12:30 UTCVendor advisory
  45. 2026-08-30 19:17 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  46. 2026-08-30 01:22 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  47. 2026-08-28 21:41 UTCEPSS rescoreEPSS 7.3% · 94th percentile
  48. 2026-08-28 16:47 UTCVendor advisory
  49. 2026-08-28 15:59 UTCEG score recompute
  50. 2026-08-28 15:59 UTCVendor advisory
  51. 2026-08-27 14:25 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  52. 2026-08-26 16:24 UTCEG score recompute
  53. 2026-08-26 16:24 UTCVendor advisory
  54. 2026-08-26 14:46 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  55. 2026-08-26 12:21 UTCEG score recompute
  56. 2026-08-26 12:21 UTCVendor advisory
  57. 2026-08-25 13:49 UTCEPSS rescoreEPSS 7.3% · 93rd percentile
  58. 2026-08-25 13:24 UTCVendor advisory
  59. 2026-08-25 12:20 UTCEG score recompute
  60. 2026-08-25 12:20 UTCVendor advisory
  61. 2026-08-24 13:29 UTCVendor advisory
  62. 2026-08-24 12:25 UTCEG score recompute
  63. 2026-08-24 12:25 UTCVendor advisory
  64. 2026-08-24 00:47 UTCVendor advisory
  65. 2026-08-23 20:41 UTCVendor advisory
  66. 2026-08-23 16:42 UTCEG score recompute
  67. 2026-08-23 16:42 UTCVendor advisory
  68. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  69. 2026-08-22 01:40 UTCEG score recompute
  70. 2026-08-22 01:40 UTCVendor advisory
  71. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  72. 2026-08-21 21:42 UTCEG score recompute
  73. 2026-08-21 21:42 UTCVendor advisory
  74. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  75. 2026-08-20 18:40 UTCVendor advisory

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

Frequently asked(5)

What is CVE-2026-42508?
CVE-2026-42508 is a critical-severity vulnerability; its CVE record was published on May 22, 2026. Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.
When was the CVE record for CVE-2026-42508 published?
The CVE record for CVE-2026-42508 was published on May 22, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 15, 2026; the record at its source may have been updated since.
Is CVE-2026-42508 actively exploited?
CVE-2026-42508 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (50th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42508?
CVE-2026-42508 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42508?
A fix for CVE-2026-42508 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42508 are linked in the Vendor Advisories panel on this page.

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