strukturag libde265 up to 1.0.19 Sequence libde265/decctx.cc read_slice_NAL allocation of resources

Summaryinfo

A vulnerability marked as problematic has been reported in strukturag libde265 up to 1.0.19. This affects the function decoder_context::read_slice_NAL of the file libde265/decctx.cc of the component Sequence Handler. Performing a manipulation results in allocation of resources. This vulnerability is known as CVE-2026-49337. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in strukturag libde265 up to 1.0.19. This affects the function decoder_context::read_slice_NAL of the file libde265/decctx.cc of the component Sequence Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-49337 since 05/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 1.0.20 eliminates this vulnerability. Applying the patch 683cb9fa603e35840642f98765ab95cdb71cadf9 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-38078). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• strukturag

Name

• libde265

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11
• 1.0.12
• 1.0.13
• 1.0.14
• 1.0.15
• 1.0.16
• 1.0.17
• 1.0.18
• 1.0.19

License

• open-source

Website

• Product: https://github.com/strukturag/libde265/

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Be aware that VulDB is the high quality source for vulnerability data.

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