CVE-2026-124307

Medium

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.

SeverityMedium

CVSS5.8

Exploit probability—

ProductFraunhoferhhi Vvdec

PublishedNov 7, 2026

First seenNov 7, 2026

Weakness typeCWE-416Use after free

How to fix

Update

fraunhoferhhi vvdec3.2.1 or later

Patches

github.com/fraunhoferhhi/vvdec/commit/1eddb30c4b8e02f3d13ba24aa7e52f1aa7b08c01

Affected products

Product	Affected versions	Fixed in
fraunhoferhhi vvdec	v < 3.2.1	3.2.1

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