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CVE-2026-66039 is a signed integer overflow vulnerability in FFmpeg through version 8.1.2 in the MACE6 audio decoder. A crafted CAF file can supply oversized bytes_per_packet and frames_per_packet values in its desc chunk. During output sample-count computation in mace_decode_frame(), these values can overflow, producing an undersized output-buffer allocation followed by a heap out-of-bounds write. The issue is fixed by FFmpeg commit aafb5c6.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An FFmpeg arbitrary-code-execution vulnerability that can be triggered by processing a specially crafted CAF audio file.
A vulnerability addressed in RHSA-2026:66381 affecting FFmpeg-related RPM packages supplied as part of the Red Hat AI application platform. The supplied CVSS vectors indicate network reachability, low attack complexity, no privileges required, required user interaction, and high confidentiality, integrity, and availability impact.
A Unity Linux/UOS Server vulnerability tracked as CVE-2026-66039. It is rated as having high impact to confidentiality, integrity, and availability; exploitation requires user interaction according to the supplied CVSS v3 vector.
A vulnerability remediated by RHSA-2026:60336 in FFmpeg-related packages used by the Red Hat AI application platform. The supplied CVSS v3/v4 vectors indicate network reachability, low attack complexity, no privileges required, and required user interaction, with high impact to confidentiality, integrity, and availability.
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.