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CVE-2026-49337

libde265 has an unbounded memory leak via orphaned slice headers in `read_slice_NAL`

Published: Jun 19, 2026Updated: Jun 22, 2026 Sources: CVE List NVDCWE-770
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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 Breakdown

AV:NAC:LPR:NUI:RS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-770

Affected Products

libde265strukturag
Library
OSS Libraries / generic-library
strukturagoss-projectOSS Librariesaka libheif, libde265, strukturag/libde265

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Impact
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References

https://github.com/strukturag/libde265/security/advisories/GHSA-g5hj-rf9f-7vxm
github.com
https://github.com/strukturag/libde265/commit/683cb9fa603e35840642f98765ab95cdb71cadf9
github.com

Timeline

Published
Jun 19, 2026
Last Updated
Jun 22, 2026

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