SB2026090405 - Multiple vulnerabilities in libde265

Description

This security bulletin contains information about 2 vulnerabilities.

1) Integer overflow (CVE-ID: CVE-2026-54240)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to disclose heap data and cause a denial of service.

The vulnerability exists due to signed integer overflow in the get_image_plane_at_pos pixel accessor variants when decoding a crafted HEVC bitstream. A remote attacker can supply a crafted HEVC bitstream to disclose heap data and cause a denial of service.

Exploitation requires HEVC picture dimensions exceeding the square root of INT32_MAX.

2) Out-of-bounds read (CVE-ID: CVE-2026-54241)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to disclose sensitive information and cause a denial of service.

The vulnerability exists due to a signed integer overflow in apply_sample_adaptive_offset_sequential() in libde265/sao.cc when processing a crafted HEVC bitstream. A remote attacker can provide a crafted HEVC bitstream with large image dimensions to disclose sensitive information and cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://github.com/strukturag/libde265/security/advisories/GHSA-ccfw-29x7-rrx3
• https://github.com/strukturag/libde265/security/advisories/GHSA-j2qq-x2xq-g9wr