Unrated

Stack Overflow in FFmpeg ffmpeg_opt.c

IdentifiersCVE-2026-39212CWE-121

CVE-2026-39212 is a stack-based buffer overflow vulnerability in FFmpeg affecting ffmpeg_opt.c. The issue is described as a regression introduced in July 2025 and impacts FFmpeg command-line parsing or option-processing logic implemented in that source file. Successful exploitation occurs when attacker-controlled input reaches the vulnerable stack-resident buffer handling path, causing memory corruption through out-of-bounds writes on the stack. As a memory corruption flaw in a widely deployed media-processing framework, the vulnerability can lead to process instability and potentially more serious compromise depending on the surrounding execution context and exploitability of the overwritten stack data.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can cause a crash of the FFmpeg process due to stack memory corruption and may permit control-flow corruption. Depending on the exact overwritten stack state, compiler protections, and runtime environment, the vulnerability could potentially be leveraged for arbitrary code execution in the security context of the FFmpeg process. In operational environments, this can affect media-processing pipelines, transcoding services, and any application that invokes FFmpeg with attacker-influenced inputs or arguments.

Mitigation

If you can’t patch tonight, do this now.

Until patched builds are deployed, reduce exposure by preventing untrusted parties from influencing FFmpeg command-line arguments or option values, restricting access to workflows that construct FFmpeg invocations from external input, and isolating FFmpeg execution with least-privilege accounts and sandboxing where feasible. Additional hardening such as stack protections, ASLR, and process isolation may reduce exploit reliability but should not be treated as a substitute for patching.

Remediation

Patch, then assume compromise.

Apply the upstream FFmpeg fix for CVE-2026-39212 or update to a vendor/distribution build that includes the patch. Because the issue is identified as a regression from July 2025, prioritize upgrading from affected builds produced after that change. Validate that all statically bundled or embedded FFmpeg copies in downstream products are also updated, not only system packages.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

3 SOURCESView more in app

cyber security newsNews

Jun 9, 2026

21 0-Day Vulnerabilities in FFmpeg Enables Remote Code Execution Attacks

Stack overflow vulnerability in FFmpeg ffmpeg_opt.c.

the hacker newsNews

Jun 6, 2026

AI Agent Uncovers 21 Zero-Days in FFmpeg; Chrome Patches Record 429 Bugs

One of nine FFmpeg vulnerabilities identified by an autonomous AI agent; the FFmpeg findings are described as mostly heap or stack overflows in parsers and demuxers.

bugflationNews

Jun 2, 2026

DepthFirst publishes twenty-one fixed FFmpeg zero-days - Bugflation

One of nine CVE-backed FFmpeg vulnerabilities in a campaign spanning demuxers, muxers, codecs, RTP handling, scaling, and command-line parsing.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity