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CVE-2026-92238 is an improper-input-validation vulnerability in Mozilla Thunderbird's mail-header parsing. A maliciously constructed mail header can cause multiple logical header fields to be parsed as a single field and can potentially trigger memory-safety violations. The issue is fixed in Thunderbird 156, Thunderbird 153.3, and Thunderbird 140.16.
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No public exploit code observed for this vulnerability.
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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.
Malformed mail-header parsing vulnerability that may cause field confusion or memory-safety violations in Thunderbird prior to 156.0.
A vulnerability addressed in the Mozilla Thunderbird update published September 15, 2026; no technical flaw details are provided.
A maliciously constructed email-header vulnerability that can cause field-parsing confusion or potential memory-safety violations 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.