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CVE-2026-113868

5.3 medium SSVC exploitation: none Awaiting Analysis
NVD · CVE.org

When authenticating to a POP3 or SMTP server using NTLM, Thunderbird did not check whether the server's challenge was valid base64. A malicious server could send a challenge that caused Thunderbird to include uninitialized heap memory in its NTLM response, disclosing that memory to the server. A challenge consisting only of base64 padding also caused an out-of-bounds read, crashing Thunderbird. This affected accounts configured to use NTLM or GSSAPI authentication. The uninitialized memory disclosure only affected NTLM. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 3

  1. StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 17:36
  2. StatusReceived → PublishedNVD modified 2026-10-20 19:46
  3. First seenCVSS 5.3NVD modified 2026-10-20 20:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3