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CVE-2026-12309

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d383aa74a68e93a5bf02cfa4a3f4ce0b4d15070fe21503c5faf17cca45f7cdb9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.12","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"152","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/cna/affected/1

{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.12","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"152","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.12","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"152","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/cna/affected/1
{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.12","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"152","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/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:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-119","description":"CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

5 source assertions
{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2038476"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/cna/references/0
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-57/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/cna/references/1
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-58/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/cna/references/2
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-60/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/cna/references/3
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-61/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:802cb6ae848802e5bed4515c3bb019058ebd28072b33cddeba98015e63102b75 · sha256:a039f8f8dd9e8b9d… · /containers/cna/references/4

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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