FFmpeg through 9.0.2 Heap Overflow in libaribcaption Text Subtitle Decoding
Affects FFmpeg through 9.0.2 when decoding text subtitles with libaribcaption (sub_type text). No fixed version is listed in the checked facts.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fix or patch referenced
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affects FFmpeg through 9.0.2 when decoding with sub_type text using libaribcaption Caption stream must contain zero regions (for example a clear-screen caption)
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 12/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in aribcaption_trans_text_subtitle() in libavcodec/libaribcaption.c when decoding with sub_type text. Attackers can supply a crafted ARIB STD-B24 caption stream with zero regions, causing a pointer write past a zero-sized sub->rects allocation and corrupting heap memory.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure5/25Specific setups only
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.3/10CVSS 7.3
- No patch0/5No signal
What would change the score
- Would score about 62 if added to CISA KEV
- Would score about 57 if CISA's SSVC rates exploitation active
- Would score about 22 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
Affects FFmpeg through 9.0.2 when decoding with sub_type text using libaribcaption Caption stream must contain zero regions (for example a clear-screen caption)Apply the patch listed under Evidence.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- FFmpeg FFmpeg
through 9.0.2
Evidence 5
- Patch
- Report
- Repository
- Repository
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-125210
Is CVE-2026-125210 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
FFmpeg's libaribcaption subtitle code has a heap buffer overflow in aribcaption_trans_text_subtitle(). A pointer write goes past a zero-sized sub->rects allocation and corrupts heap memory.Source: vulncheck.com
Which versions are affected by CVE-2026-125210?
FFmpeg: through 9.0.2.Source: cve.now feed data
Am I affected, and how do I check?
FFmpeg through 9.0.2 when decoding with sub_type text using libaribcaption. The trigger is an ARIB STD-B24 caption stream with zero regions, such as a clear-screen caption. To check, look at the FFmpeg version and whether the libaribcaption decoder with sub_type text is in use.Source: vulncheck.com
How do I fix CVE-2026-125210?
The checked facts do not list a fixed version, so no upgrade target can be named. Check FFmpeg's release notes for a version newer than 9.0.2 that includes the fix.Source: vulncheck.com