USN-8683-1: libheif vulnerabilities

unknownCVE-2026-62289 CVE-2026-62291

Feng Ning discovered that libheif incorrectly handled certain image transforms. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS. (CVE-2026-62289) Ali Firas discovered that libheif incorrectly handled certain images. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 24.04 LTS. (CVE-2026-62291)

CSIRTS triage

vendor: libheif product: libheif Denial of service Remote code executionaffected: Ubuntu 18.04 LTS, 20.04 LTS, 22.04 LTS (CVE-2026-62289); Ubuntu 24.04 LTS (CVE-2026-62291)

What: libheif incorrectly handles certain image transforms and malformed images, leading to denial of service or arbitrary code execution.
Who is affected: Systems using libheif on Ubuntu 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS are affected.
Urgency: Moderate urgency; arbitrary code execution is possible in Ubuntu 24.04 LTS and denial of service in earlier versions.
Action: Apply security updates from Ubuntu for libheif across all affected LTS releases.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-26
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8683-1

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-2026-622890.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-622910.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-62289	coverage & exploitation status	NVD · CVE.org
CVE-2026-62291	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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