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CVE-2026-3950— strukturag libheif stsz/stts track.cc load out-of-bounds

Quick assessment

Affected
strukturag libheif
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libheif是struktur开源的一款 ISO/IEC 23008-12:2017 HEIF 文件格式解码器和编码器。 strukturag libheif 1.21.2及之前版本存在缓冲区错误漏洞，该漏洞源于组件stsz/stts中文件libheif/sequences/track.cc函数Track::load的错误操作，可能导致越界读取。

CVSS 3.3 · Low EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection
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I. Basic Information for CVE-2026-3950

Vulnerability Information
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Vulnerability Title
strukturag libheif stsz/stts track.cc load out-of-bounds
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in strukturag libheif up to 1.21.2. This impacts the function Track::load of the file libheif/sequences/track.cc of the component stsz/stts. The manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. Applying a patch is the recommended action to fix this issue. The patch available is inofficial and not approved yet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
libheif 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libheif是struktur开源的一款 ISO/IEC 23008-12:2017 HEIF 文件格式解码器和编码器。 strukturag libheif 1.21.2及之前版本存在缓冲区错误漏洞，该漏洞源于组件stsz/stts中文件libheif/sequences/track.cc函数Track::load的错误操作，可能导致越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libheif 1.21.0 -

II. Public POCs for CVE-2026-3950

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III. Intelligence Information for CVE-2026-3950

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Patches & Fixes for CVE-2026-3950 (1)

Vendor Advisories for CVE-2026-3950 (2)

Proof of Concept for CVE-2026-3950 (2)

Vendor Pages for CVE-2026-3950 (1)

IV. Related Vulnerabilities

Same product: libheif
Same vendor: strukturag
Same weakness: CWE-125

V. Comments for CVE-2026-3950

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