CVE-2026-3949 Details
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.
A vulnerability allowing out-of-bounds read has been identified in strukturag libheif versions through 1.21.2. This issue arises in the HEIF file parser component, specifically within the vvdec_push_data2 function of the decoder_vvdec.cc file. The vulnerability is caused by the function improperly validating the size of NAL units before processing them, which can lead to reading data beyond the intended buffer. The issue must be exploited locally, and a public proof-of-concept is available.
Users are advised to update to version 1.21.3 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Mar 11, 2026CISA-ADP
Assessed Mar 11, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/biniamf/pocs/tree/main/libheif_vvdec | [email protected] | Exploit |
| https://github.com/strukturag/libheif/ | [email protected] | ProductVendor |
| https://github.com/strukturag/libheif/commit/b97c8b5f198b27f375127cd597a35f2113544d03 | [email protected] | Source CodeVendor |
| https://github.com/strukturag/libheif/issues/1712 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/strukturag/libheif/issues/1712#issuecomment-3947938531 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://vuldb.com/?ctiid.350381 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/?id.350381 | [email protected] | AdvisoryBundleExploitRemedy |
| https://vuldb.com/?submit.765979 | [email protected] | Technical Description |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| strukturag libheif | <= 1.21.2 (semver) |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 11, 2026 | New CVE Received | [email protected] |