Out-of-bounds read in IMAP response parser

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92240
StatePUBLISHED
Assignermozilla
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 20:19:41 UTC
Updated2026-09-15 20:19:41 UTC
DescriptionA malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by sending an untagged '* ID' response, crashing Thunderbird. The affected parsing path is reachable before authentication. This vulnerability was fixed in Thunderbird 156 and Thunderbird 140.16.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mozilla Thunderbird unaffected 140.16 140.* rpm Not specified
CNA Mozilla Thunderbird unaffected 156 * rpm Not specified

References

ReferenceSourceLinkTags
bugzilla.mozilla.org/show_bug.cgi [email protected] bugzilla.mozilla.org
www.mozilla.org/security/advisories/mfsa2026-94 [email protected] www.mozilla.org
www.mozilla.org/security/advisories/mfsa2026-95 [email protected] www.mozilla.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Ahmed Albalawi (en)

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