High severity · published Jun 19, 2026
CVE-2026-49295
libde265 has an out-of-bounds write in process_reference_picture_set via predicted short-term RPS
7.1
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libde265 · strukturag
< 1.0.20 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49295
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-49295
Patch
https://github.com/strukturag/libde265/commit/691f3a3c55b3d32478c4a49895dee061a282652b
Exploit
https://github.com/strukturag/libde265/security/advisories/GHSA-g2rg-wj66-w594
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