What’s Vulnerable › Vulnerabilities

CVE-2026-49337: libde265 has an unbounded memory leak via orphaned slice headers in `read_slice_NAL`

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-19 · updated 2026-10-25
• Weakness: CWE-770

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.

Affected products

• strukturag libde265: before 1.0.20

References

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

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