implementation of the AV1 video codec. All of them affect the encoder;
applications that only decode AV1 video are not affected.
CVE-2026-56208
In look-ahead processing (LAP) mode the first-pass statistics buffer
was sized from the configured lag-in-frames alone, leaving it shorter
than the longest group of pictures the encoder may analyse. Together
with an off-by-one in the number of frames considered, this allowed
the encoder to read and write outside the allocation, resulting in
denial of service or potentially the execution of arbitrary code.
CVE-2026-56209, CVE-2026-56210, CVE-2026-56211
The AOME_SET_SPATIAL_LAYER_ID and AV1E_SET_SVC_LAYER_ID codec
controls did not validate the supplied scalable video coding (SVC)
layer identifiers against the number of layers actually configured.
A negative or too large identifier led to an out-of-bounds read of
the layer context array, an out-of-bounds write through the cyclic
refresh map pointer, and potentially the execution of arbitrary
code. Exploitation requires an application that allows an attacker
to influence the encoder's SVC configuration.
Additionally this update validates the configured number of spatial and
temporal layers, which the affected version accepted without any range
check.
https://security-tracker.debian.org/tracker/DSA-6411-1
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