CVE-2026-92240
Out-of-bounds read in IMAP response parser
Description
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 156 and Thunderbird 140.16.
INFO
Published Date :
Sept. 15, 2026, 8:19 p.m.
Last Modified :
Sept. 15, 2026, 8:19 p.m.
Remotely Exploit :
No
Source :
[email protected]
Solution
- Update Thunderbird to version 140.16 or later.
- Ensure IMAP server responses are properly formatted.
- Consider disabling IMAP if updates are delayed.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-92240.
| URL | Resource |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2069113 | |
| https://www.mozilla.org/security/advisories/mfsa2026-94/ | |
| https://www.mozilla.org/security/advisories/mfsa2026-95/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-92240 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-92240
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-92240 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-92240 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Sep. 15, 2026
Action Type Old Value New Value Added Description 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 156 and Thunderbird 140.16. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/92xxx/CVE-2026-92240.json">CVE-2026-92240</a> Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=2069113 Added Reference https://www.mozilla.org/security/advisories/mfsa2026-94/ Added Reference https://www.mozilla.org/security/advisories/mfsa2026-95/