Medium severity · published Jun 19, 2026
CVE-2026-49337
libde265 has an unbounded memory leak via orphaned slice headers in `read_slice_NAL`
4.3
CVSS
0.2%
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 sequence of H.265 NAL units causes `decoder_context::read_slice_NAL()` (`libde265/decctx.cc:481`) to attach slice headers to a finished picture object
that has no active image unit, resulting in attacker-controlled unbounded heap growth. The retained headers are never freed until the picture is released, which may not happen during continuous streaming. 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:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% 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
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49337
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-49337
github.com
https://github.com/strukturag/libde265/commit/683cb9fa603e35840642f98765ab95cdb71cadf9
github.com
https://github.com/strukturag/libde265/security/advisories/GHSA-g5hj-rf9f-7vxm
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