Unrated

Stack Overflow in FFmpeg ffmpeg_opt.c

IdentifiersCVE-2026-39212CWE-121

CVE-2026-39212 is a stack overflow vulnerability in FFmpeg affecting ffmpeg_opt.c. The available reporting describes it as a regression introduced in July 2025. No additional technical detail about the exact vulnerable function, triggering option, or code path is provided in the supplied content beyond the affected source file and the bug class.

For your environment

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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 would allow an attacker to trigger a stack-based memory corruption condition in FFmpeg. Based on the vulnerability class, impact could include process crash and potential code execution, but the supplied content does not provide a verified exploitation outcome specific to CVE-2026-39212.

Mitigation

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

Until patched builds are deployed, reduce exposure by restricting use of vulnerable FFmpeg builds, especially in workflows that process untrusted media or attacker-controlled inputs. Limit who can supply command-line arguments, media files, or automation inputs to FFmpeg-based pipelines, and isolate FFmpeg processing in sandboxed or least-privileged environments where feasible. Specific mitigations beyond patching are not provided in the supplied content.

Remediation

Patch, then assume compromise.

Update FFmpeg to a fixed upstream release or apply the relevant vendor/distribution security update that includes the fix for CVE-2026-39212. Because the issue is described as a regression from July 2025, remediation requires deploying a build that contains the post-regression patch.

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

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

2 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.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

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

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-39212

NVD

nvd.nist.gov/vuln/detail/CVE-2026-39212

MITRE CWE · CWE-121

cwe.mitre.org