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CVE-2026-0882 is a high-severity use-after-free vulnerability in the IPC (inter-process communication) component of Mozilla Firefox and Thunderbird. The flaw affects Firefox prior to 147, Firefox ESR prior to 115.32 and 140.7, and Thunderbird prior to 147 and 140.7. A use-after-free condition can occur when memory associated with an IPC object is freed and later reused, creating a memory corruption condition in a security-sensitive browser subsystem. Mozilla’s advisory classifies the issue as high severity, and supporting advisory content indicates the resulting corruption could crash the application and may be exploitable for arbitrary code execution in the context of the browser process.
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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.
7 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.