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Vulnerability · Published Mar 11, 2026 · Assigned by VulDB

CVE-2026-3949strukturag libheif HEIF File decoder_vvdec.cc vvdec_push_data2 out-of-bounds

Low 3.3

In plain English

A low-severity out-of-bounds read in libheif from strukturag. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.1%top 96.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A vulnerability was determined in strukturag libheif up to 1.21.2. This affects the function vvdec_push_data2 of the file libheif/plugins/decoder_vvdec.cc of the component HEIF File Parser. Executing a manipulation of the argument size can lead to out-of-bounds read. The attack needs to be launched locally. The exploit has been publicly disclosed and may be utilized. This patch is called b97c8b5f198b27f375127cd597a35f2113544d03. It is advisable to implement a patch to correct this issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libheifno fix listedDEBIAN-CVE-2026-3949
Debian:13libheif1.23.1-1DEBIAN-CVE-2026-3949
Debian:14libheif1.23.1-1DEBIAN-CVE-2026-3949
Ubuntu:24.04:LTSlibheifno fix listedUBUNTU-CVE-2026-3949
Ubuntu:25.10libheifno fix listedUBUNTU-CVE-2026-3949

Affected products (as reported)

VendorProductVersions
strukturag libheif 1.21.01.21.11.21.2

Weakness: CWE-125, CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

References