Bug 2556402 (CVE-2026-113869)

Summary: CVE-2026-113869 thunderbird: thunderbird: Use-after-free via S/MIME decryption password prompt
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: gotiwari, jhorak, mvyas, rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Thunderbird. When requesting a security device password, such as a smartcard PIN or Primary Password, while decrypting a Secure/Multipurpose Internet Mail Extensions (S/MIME) message, the message loading process can finish or be canceled while the prompt remains open. This premature termination frees the message decoder while it is still in use, resulting in a use-after-free memory error. An attacker could exploit this vulnerability to cause an application crash, leading to a Denial of Service (DoS), or potentially execute arbitrary code.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-20 19:31:39 UTC 
When Thunderbird asked for a security device password (for example a smartcard PIN or the Primary Password) while decrypting an S/MIME message, the message load could finish or be cancelled while the prompt was open. This freed the message decoder while it was still in use, causing a use-after-free and a potentially exploitable crash. This vulnerability was fixed in Thunderbird 158.0.1.