CVE-2026-49295: libde265 has an out-of-bounds write in process_reference_picture_set via predicted short-term RPS

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-06-19 · updated 2026-10-25
Weakness: CWE-787

Description

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted H.265 bitstream can cause an out-of-bounds array write in `decoder_context::process_reference_picture_set()` (`libde265/decctx.cc:1376`). The root cause is a missing aggregate bound check on predicted short-term reference picture set entries. Individual list sizes are validated, but the combined count after predicted RPS construction can exceed the 16-entry `PocStFoll` array, writing at index 16. Version 1.0.20 patches the issue.

Affected products

strukturag libde265: before 1.0.20 — fixed in 1.0.20

How to fix

Upgrade to a fixed version: strukturag libde265 1.0.20. Check the vendor advisory for mitigations.

References

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