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CRITICAL

CVE-2026-42508

CVE-2026-42508 — Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts

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.

Published Updated Sources: cvelistV5, Go

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

1%

chance of exploitation in 30 days

Affects

golang org x crypto

55 products listed

CVSS base

9.1

CRITICAL

CISA SSVC assessment

Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.

CISA

Exploitation

None

none · proof-of-concept · active

Automatable

Yes

can an attacker script all four kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Affected scope

The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.

Products (55)

golang org x crypto ssh knownhostsred hat enterprise linux 10red hat enterprise linux 8red hat enterprise linux 8 6 advanced mission critical update supportred hat enterprise linux 8 6 extended update support long life add onred hat enterprise linux 8 8 telecommunications update servicered hat enterprise linux 8 8 update services for sap solutionsred hat enterprise linux 9rhem 1 0 for rhel 9rhem 1 1 for rhel 10rhem 1 1 for rhel 9cluster observability operator 1 5 0devworkspace operator 0 42logging subsystem for red hat openshift 6 6multicluster engine for kubernetes 2 1multicluster engine for kubernetes 2 11multicluster engine for kubernetes 2 8openshift api for data protection 1 3openshift api for data protection 1 4openshift api for data protection 1 5openshift api for data protection 1 6red hat advanced cluster management for kubernetes 2 11red hat advanced cluster management for kubernetes 2 13red hat advanced cluster management for kubernetes 2 16red hat advanced cluster security 4 9red hat advanced cluster security for kubernetes 4 10red hat edge manager 1 0red hat edge manager 1 1red hat hardened imagesred hat openshift ai 2 25red hat openshift ai 3 4red hat openshift builds 1 7 3red hat openshift builds 1 8 1red hat openshift data foundation 4 22red hat openshift gitops 1 19red hat openshift gitops 1 20red hat quay 3 10red hat quay 3 12red hat quay 3 15red hat quay 3 16red hat quay 3 9red hat trusted artifact signer 1 4assisted installer for red hat openshift container platform 2cert manager operator for red hat openshiftexternaldns operatorexternal secrets operator for red hat openshiftopenshift pipelinesopenshift serverlessred hat enterprise linux ai rhel ai 3red hat openshift container platform 4red hat openshift virtualization 4red hat openstack platform 16 2red hat openstack platform 17 1red hat openstack platform 18 0red hat quay 3

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactSource
9.1CVSS 3.1CRITICAL——cvelistV5

Weakness & attack patterns

  • CWE-295

References

25 on the record

Elsewhere on this site

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.