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

🗓️ 11 Aug 2026 13:56:36Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 5 Views

Off-by-one buffer over-read in Thunderbird MIME header parser for forwarded messages can crash the application.

Related
Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.6aarch64thunderbird140.13.0-1.el9_6thunderbird-140.13.0-1.el9_6.aarch64.rpm
Red Hat Enterprise Linux9.6ppc64lethunderbird140.13.0-1.el9_6thunderbird-140.13.0-1.el9_6.ppc64le.rpm
Red Hat Enterprise Linux9.6s390xthunderbird140.13.0-1.el9_6thunderbird-140.13.0-1.el9_6.s390x.rpm
Red Hat Enterprise Linux9.6x86_64thunderbird140.13.0-1.el9_6thunderbird-140.13.0-1.el9_6.x86_64.rpm
Red Hat Enterprise Linux9.6aarch64thunderbird-debuginfo140.13.0-1.el9_6thunderbird-debuginfo-140.13.0-1.el9_6.aarch64.rpm
Red Hat Enterprise Linux9.6ppc64lethunderbird-debuginfo140.13.0-1.el9_6thunderbird-debuginfo-140.13.0-1.el9_6.ppc64le.rpm
Red Hat Enterprise Linux9.6s390xthunderbird-debuginfo140.13.0-1.el9_6thunderbird-debuginfo-140.13.0-1.el9_6.s390x.rpm
Red Hat Enterprise Linux9.6x86_64thunderbird-debuginfo140.13.0-1.el9_6thunderbird-debuginfo-140.13.0-1.el9_6.x86_64.rpm
Red Hat Enterprise Linux9.6aarch64thunderbird-debugsource140.13.0-1.el9_6thunderbird-debugsource-140.13.0-1.el9_6.aarch64.rpm
Red Hat Enterprise Linux9.6ppc64lethunderbird-debugsource140.13.0-1.el9_6thunderbird-debugsource-140.13.0-1.el9_6.ppc64le.rpm
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12 Aug 2026 15:49Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.17.5
EPSS0.00274
SSVC
5