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CVE-2026-14899

Off-by-one out of bounds read in MIME header parser for forwarding PUBLISHED

Description (CNA)

The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.

Affected (CNA)

Vendor / productVersions
Mozilla / Thunderbirdunaffected 140.13 through 140.*; unaffected 153 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.