Fraunhofer HHI VVdeC before 3.2.1 Heap Use-After-Free via ALF APS Redefinition
- Exploited
- No known exploitation
- Fix
- Fixed in 3.2.1
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 3.2.1.
- 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? →
- 6/100 · provisional
- 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
Fraunhofer HHI's VVdeC video decoder, before version 3.2.1, contains a memory-corruption bug that a local attacker can trigger without logging in, though it requires a user to take an action such as opening a crafted VVC bitstream. Successful exploitation can crash the decoder or corrupt heap memory when multithreaded decoding is used.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
Fraunhofer HHI VVdeC before 3.2.1 contains a heap use-after-free vulnerability that allows attackers to corrupt memory by redefining an ALF adaptation parameter set id still referenced by slices. Attackers can supply a crafted VVC bitstream that, with multithreaded decoding, makes worker threads dereference freed APS objects in CABACReader::readAlf() and AdaptiveLoopFilter::reconstructCoeff(), causing crashes or heap corruption.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure?/25Unknown. No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity5.8/10CVSS 5.8
- No patch0/5No signal
What would change the score
- Would score about 61 if added to CISA KEV
- Would score about 56 if CISA's SSVC rates exploitation active
- Would score about 28 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 3.2.1.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- fraunhoferhhi vvdec
fixed in 3.2.1
Evidence 8
- Patch
- Report
- Report
- Repository
- Repository
Show all 8 sourcesShow fewer sources
- Repository
- Repository
- Link
Corrections
None so far.
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Questions about CVE-2026-124307
Is CVE-2026-124307 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
Which versions are affected by CVE-2026-124307?
vvdec: before 3.2.1.Source: cve.now feed data
How do I fix CVE-2026-124307?
Upgrade to a fixed version: 3.2.1.Source: cve.now feed data