USN-8573-1: libde265 vulnerabilities

unknownCVE-2023-51792 CVE-2024-38949 CVE-2024-38950 CVE-2025-61147 CVE-2026-33164 CVE-2026-33165

It was discovered that libde265 did not properly manage memory under certain circumstances. An attacker could possibly use this issue to cause libde265 to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS. (CVE-2023-51792) It was discovered that libde265 did not properly handle certain malformed media files, leading to a heap buffer overflow. An attacker could possibly use this issue to cause libde265 to crash, resulting in a denial of service. (CVE-2024-38949, CVE-2024-38950) It was discovered that libde265 did not properly handle certain malformed input, leading to a segmentation fault. An attacker could possibly use this issue to cause libde265 to crash, resulting in a denial of service. (CVE-2025-61147) It was discovered that libde265 did not properly handle a malformed H.265 PPS NAL unit, leading to a segmentation fault. An attacker could possibly use this issue to cause libde265 to crash, resulting in a denial of service. (CVE-2026-33164) It was discovered that libde265 did not properly handle certain crafted HEVC bitstreams, leading to an out-of-bounds write. An attacker could possibly use this issue to cause libde265 to crash, resulting in a denial of service. (CVE-2026-33165) Valentin Mercier discovered that libde265 did not properly validate tile geometry when handling crafted media files, leading to an out-of-bounds read. An attacker could possibly use this issue to cause libde265 to crash, resulting in a denial of service, or to obtain sensitive information. (CVE-2026-45382) It was discovered that libde265 did not properly validate certain values when decoding crafted media files, leading to an out-of-bounds read. An attacker could possibly use this issue to cause libde265 to crash, resulting in a denial of service, or to obtain sensitive information. (CVE-2026-45383) Ying Dong discovered that libde265 did not properly validate reference picture set entries when handling a crafted H.265 bitstream, leading to an out-of-bou

CSIRTS triage

vendor: libde265 product: libde265 Denial of serviceaffected: Ubuntu 22.04 LTS

What: Multiple vulnerabilities in libde265 could allow an attacker to cause the library to crash.
Who is affected: Users of libde265 on Ubuntu 22.04 LTS.
Urgency: Remediation is necessary as the vulnerabilities can lead to denial of service.
Action: Apply the latest patches for libde265 to address the vulnerabilities.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-20
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8573-1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2023-517920.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all scored CVEs.
Low exploitation riskCVE-2024-389490.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 36% of all scored CVEs.
Low exploitation riskCVE-2024-389500.45% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all scored CVEs.
Low exploitation riskCVE-2025-611470.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all scored CVEs.
Low exploitation riskCVE-2026-331640.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all scored CVEs.
Low exploitation riskCVE-2026-331650.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all scored CVEs.
Low exploitation riskCVE-2026-453820.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.
Low exploitation riskCVE-2026-453830.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.
Low exploitation riskCVE-2026-492950.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all scored CVEs.
Low exploitation riskCVE-2026-493370.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2023-51792	coverage & exploitation status	NVD · CVE.org
CVE-2024-38949	coverage & exploitation status	NVD · CVE.org
CVE-2024-38950	coverage & exploitation status	NVD · CVE.org
CVE-2025-61147	coverage & exploitation status	NVD · CVE.org
CVE-2026-33164	coverage & exploitation status	NVD · CVE.org
CVE-2026-33165	coverage & exploitation status	NVD · CVE.org
CVE-2026-45382	coverage & exploitation status	NVD · CVE.org
CVE-2026-45383	coverage & exploitation status	NVD · CVE.org
CVE-2026-49295	coverage & exploitation status	NVD · CVE.org
CVE-2026-49337	coverage & exploitation status	NVD · CVE.org
CVE-2026-49346	coverage & exploitation status	NVD · CVE.org
CVE-2026-54240	coverage & exploitation status	NVD · CVE.org
CVE-2026-54241	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.