Bug 2534187 (CVE-2026-92240) - CVE-2026-92240 thunderbird: Out-of-bounds read in IMAP response parser
Summary: CVE-2026-92240 thunderbird: Out-of-bounds read in IMAP response parser
Keywords:
Status: NEW
Alias: CVE-2026-92240
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-15 20:03 UTC by OSIDB Bzimport
Modified: 2026-09-24 01:58 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:70642 0 None None None 2026-09-24 01:58:13 UTC

Description OSIDB Bzimport 2026-09-15 20:03:13 UTC 
A 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 140.16.
Comment 1 Jon Orris 2026-09-24 01:58:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:70642 https://access.redhat.com/errata/RHSA-2026:70642
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