Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-40685

In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator encounters malformed JSON in an untrusted header, because of an incorrect implementation of \ skipping.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:479b423bd0b2a152e7877bef6fd3881f5f764eb083e65fa63de26b3d43844cee
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:v2:631201eaa5811c38c5ce9aebce9ea2928791c2f0d455837de0117eba8c47ae63 · sha256:25b6910e127d1acd… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:631201eaa5811c38c5ce9aebce9ea2928791c2f0d455837de0117eba8c47ae63 · sha256:25b6910e127d1acd… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-684","description":"CWE-684 Incorrect Provision of Specified Functionality","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:631201eaa5811c38c5ce9aebce9ea2928791c2f0d455837de0117eba8c47ae63 · sha256:25b6910e127d1acd… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"url":"https://code.exim.org/exim/exim/commit/9fdc057e71b87c87a0d3d2288b2810a0efaaba57"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:631201eaa5811c38c5ce9aebce9ea2928791c2f0d455837de0117eba8c47ae63 · sha256:25b6910e127d1acd… · /containers/cna/references/2
{"url":"https://exim.org/static/doc/security/CVE-2026-40685.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:631201eaa5811c38c5ce9aebce9ea2928791c2f0d455837de0117eba8c47ae63 · sha256:25b6910e127d1acd… · /containers/cna/references/3
{"url":"https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40685.assessment"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:631201eaa5811c38c5ce9aebce9ea2928791c2f0d455837de0117eba8c47ae63 · sha256:25b6910e127d1acd… · /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:v2:631201eaa5811c38c5ce9aebce9ea2928791c2f0d455837de0117eba8c47ae63 · sha256:25b6910e127d1acd… · /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.

← Back to CVE Explorer