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CVE-2026-5732 is an integer overflow vulnerability in Mozilla's Graphics: Text component caused by incorrect boundary conditions. The issue affects Firefox versions earlier than 149.0.2 and Firefox ESR versions earlier than 140.9.1; the provided content also indicates Thunderbird was fixed in 149.0.2 and 140.9.1. The flaw can be triggered during processing of text-related graphics content, where improper bounds handling leads to an integer overflow condition. Mozilla references Bugzilla bug 2017867 and advisories MFSA-2026-25 and MFSA-2026-27 for vendor acknowledgment and fixes.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.