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CVE-2026-40687

In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:67c98d5d521c4c33f79156f464627427d14ed55f0bb2c5897cec3b03ae553d8f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Exim","vendor":"Exim","versions":[{"lessThan":"4.99.2","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:80e2f9554be0cc776a217d39c5678f5943217988fa1965479b51c1065c8d6cde · sha256:adc2a47e8b4191d8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:80e2f9554be0cc776a217d39c5678f5943217988fa1965479b51c1065c8d6cde · sha256:adc2a47e8b4191d8… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-909","description":"CWE-909 Missing Initialization of Resource","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:80e2f9554be0cc776a217d39c5678f5943217988fa1965479b51c1065c8d6cde · sha256:adc2a47e8b4191d8… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"url":"https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:80e2f9554be0cc776a217d39c5678f5943217988fa1965479b51c1065c8d6cde · sha256:adc2a47e8b4191d8… · /containers/cna/references/2
{"url":"https://exim.org/static/doc/security/CVE-2026-40687.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:80e2f9554be0cc776a217d39c5678f5943217988fa1965479b51c1065c8d6cde · sha256:adc2a47e8b4191d8… · /containers/cna/references/3
{"url":"https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:80e2f9554be0cc776a217d39c5678f5943217988fa1965479b51c1065c8d6cde · sha256:adc2a47e8b4191d8… · /containers/cna/references/1
{"url":"https://www.openwall.com/lists/oss-security/2026/04/30/21"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:80e2f9554be0cc776a217d39c5678f5943217988fa1965479b51c1065c8d6cde · sha256:adc2a47e8b4191d8… · /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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