What’s Vulnerable › Vulnerabilities

CVE-2026-49346: libde265 has a heap buffer overflow in de265_image_get_buffer via SPS dimension integer overflow

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-19 · updated 2026-10-25
• Weakness: CWE-190

Description

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.1.0, a crafted H.265 bitstream with large SPS dimensions and 16-bit bit depth causes a signed integer overflow in `de265_image_get_buffer()` (`libde265/image.cc:128`). The overflow wraps the plane allocation size to a small value (~1 KB), but the subsequent `fill_image()` call computes the real size using `size_t`, writing ~4 GB into the undersized heap buffer. Version 1.1.0 patches the issue.

Affected products

• strukturag libde265: before 1.1.0 — fixed in 1.1.0

How to fix

Upgrade to a fixed version: strukturag libde265 1.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/strukturag/libde265/commit/8a1b5cf212f78e1c77cb46eb5d56e492a9336eb8
• https://github.com/strukturag/libde265/security/advisories/GHSA-vv8h-932h-7r86
• https://github.com/strukturag/libde265/security/advisories/GHSA-vv8h-932h-7r86

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