Loading vulnerability…
CVE-2026-92239 is an out-of-bounds buffer read in Mozilla Thunderbird's handling of IMAP protocol lines. A maliciously constructed IMAP line can cause Thunderbird to read beyond the bounds of an allocated buffer while parsing the response. The issue is fixed in Thunderbird 156, Thunderbird ESR 140.16, and Thunderbird 153.3.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Out-of-bounds buffer-read vulnerability triggered through a maliciously constructed IMAP line in Thunderbird prior to 156.0.
A vulnerability addressed in the Mozilla Thunderbird update published September 15, 2026; no technical flaw details are provided.
An out-of-bounds buffer-read vulnerability triggered by a maliciously constructed IMAP line in Thunderbird before 156.0.
A vulnerability addressed by Mozilla Thunderbird 140.16; no further technical details are provided.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.