Out-of-bounds Read in Fraunhoferhhi Vvdec
CVE-2026-124309
Fraunhofer HHI VVdeC before 3.2.1 contains a heap out-of-bounds read vulnerability in SEIReader::xParseSEIScalableNesting that allows attackers to read past heap allocations by casting the SEI wrapper object instead of its payload. Attackers can supply a crafted VVC bitstream with a scalable nesting SEI containing a nested buffering period SEI to crash the decoder or copy adjacent heap memory.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/fraunhoferhhi/vvdec (product)
- github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/CommonLib/Slice.h (technical-description)
- github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/DecoderLib/SEIread.cpp (technical-description)
- github.com/fraunhoferhhi/vvdec/commit/1d657c7a822987d2ff935e9c227c5faf5318ca06 (patch)
- github.com/fraunhoferhhi/vvdec/issues/397 (issue-tracking)
- VulnCheck Advisory: Fraunhofer HHI VVdeC before 3.2.1 Heap Out-of-Bounds Read via SEIReader::xParseSEIScalableNesting (third-party-advisory)
Frequently asked questions
- What is CVE-2026-124309?
- CVE-2026-124309 is a medium-severity vulnerability in Fraunhoferhhi Vvdec, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-11-07.
- How severe is CVE-2026-124309?
- Medium severity. CVSS v3 base score is 6.1 out of 10.