CVE-2026-42508 (GCVE-0-2026-42508)

Vulnerability from cvelistv5 – Published: 2026-05-22 02:31 – Updated: 2026-07-03 12:05
VLAI?
Title
Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts
Summary
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.
Severity ?
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
Go
References
Impacted products
Vendor Product Version
golang.org/x/crypto golang.org/x/crypto/ssh/knownhosts Affected: 0 , < 0.52.0 (semver)
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golang.org/x/crypto/ssh/knownhosts. This vulnerability occurs because the system did not correctly check for the revocation status of a SignatureKey belonging to a Certificate Authority (CA). A remote attacker could potentially exploit this by presenting a revoked key, leading to the system accepting it as valid. This could allow an attacker to bypass security checks and potentially gain unauthorized access or spoof legitimate entities.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-295\", \"description\": \"Improper Certificate Validation\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-02T12:05:05.856Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 9.1, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42508\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-22T18:43:40.584666Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-22T18:43:51.337Z\"}}], \"cna\": {\"title\": \"Invoking  auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts\", \"affected\": [{\"vendor\": \"golang.org/x/crypto\", \"product\": \"golang.org/x/crypto/ssh/knownhosts\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.52.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/crypto/ssh/knownhosts\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"hostKeyDB.IsRevoked\"}]}], \"references\": [{\"url\": \"https://go.dev/issue/79568\"}, {\"url\": \"https://go.dev/cl/781220\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/a082jnz-LvI\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-5021\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Previously, a revoked \u0027SignatureKey\u0027 belonging to a CA was not correctly checked for revocation. Now, both the \u0027key\u0027 and \u0027key.SignatureKey\u0027 are checked for @revoked.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-295: Improper Certificate Validation\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-05-22T02:31:27.644Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-42508\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-02T12:05:05.856Z\", \"dateReserved\": \"2026-04-28T00:21:12.792Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-05-22T02:31:27.644Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.