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CVE-2026-40355

In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, causing the process to terminate in parse_nego_message.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:778bf69bbeb4b3a251f979be349474a525beeead3145b9bce4a0b6001e2b289c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 11 assertions

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/5

{"defaultStatus":"unaffected","product":"Kerberos 5","vendor":"MIT","versions":[{"lessThan":"1.22.3","status":"affected","version":"1.18","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/cna/affected/0

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/2

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/3

{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/9

{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/8

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/4

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/7

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/1

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/6

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/0

Affected products and versions

11 source assertions
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/5
{"defaultStatus":"unaffected","product":"Kerberos 5","vendor":"MIT","versions":[{"lessThan":"1.22.3","status":"affected","version":"1.18","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/cna/affected/0
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/2
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/3
{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/9
{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/8
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/4
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/7
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/1
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/6
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-476","description":"CWE-476 NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"tags":["exploit"],"url":"https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/0/references/0
{"url":"https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/cna/references/1
{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/references/1
{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/adp/1/references/0
{"url":"https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/cna/references/2
{"url":"https://web.mit.edu/kerberos/advisories/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a0e53492cc9cb3e3a005ade8314a020b968005a44a5d40b15923d1fc2ee2fe96 · sha256:f542dc1e2d808e67… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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