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CVE-2026-50142— libheif: unbounded heap allocation in HEIF sequence parser (stsz fixed-size mode missing bound check)

Quick assessment

Affected
strukturag libheif
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

struktur AG libheif是struktur AG组织的一款图像编解码库。 struktur AG libheif 1.19.0版本至1.23.0之前版本存在安全漏洞，该漏洞源于libheif/sequences/seq_boxes.cc中Box_stsz::parse()对固定大小样本的sample_count未限制以及libheif/sequences/track.cc中Track::load()的32位算术环绕，攻击者通过特制HEIF序列利用heif_context_read_from_

CVSS 7.5 · High EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif >= 1.19.0, < 1.23.0 affected
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I. Basic Information for CVE-2026-50142

Vulnerability Information
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Vulnerability Title
libheif: unbounded heap allocation in HEIF sequence parser (stsz fixed-size mode missing bound check)
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.0, a crafted HEIF sequence accepted by heif_context_read_from_memory() with the msf1 sequence brand can cause unbounded heap allocation. In libheif/sequences/seq_boxes.cc, Box_stsz::parse() applies max_sequence_frames only to variable-size samples, so fixed-size mode accepts an attacker-controlled sample_count without a bound. In libheif/sequences/track.cc, Track::load() also adds current_sample_idx and samples_per_chunk in 32-bit arithmetic, allowing the consistency check to be bypassed by wraparound. The resulting values reach the Chunk::Chunk() allocation path, which can consume gigabytes of memory and crash or stall the process through memory exhaustion. This issue is fixed in version 1.23.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
struktur AG libheif 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
struktur AG libheif是struktur AG组织的一款图像编解码库。 struktur AG libheif 1.19.0版本至1.23.0之前版本存在安全漏洞，该漏洞源于libheif/sequences/seq_boxes.cc中Box_stsz::parse()对固定大小样本的sample_count未限制以及libheif/sequences/track.cc中Track::load()的32位算术环绕，攻击者通过特制HEIF序列利用heif_context_read_from_
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 >= 1.19.0, < 1.23.0 -

II. Public POCs for CVE-2026-50142

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9046 chars
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III. Intelligence Information for CVE-2026-50142

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Patches & Fixes for CVE-2026-50142 (1)

Vendor Advisories for CVE-2026-50142 (1)

Vendor Pages for CVE-2026-50142 (1)

Same Patch Batch · strukturag · 2026-08-18 · 5 CVEs total

CVE-2026-62292 8.7 HIGH libheif: Out-of-bounds read in uncompressed unci tile range slicing
CVE-2026-62291 5.3 MEDIUM libheif: Heap out of bounds write in libheif uncompressed encoder when writing images with
CVE-2026-62289 4.3 MEDIUM libheif: Integer underflow in Fraction constructor via double clap transform application
CVE-2026-62377 4.3 MEDIUM libheif: Reachable assertion in HeifContext::get_track() aborts on a valid-but-empty HEIF

IV. Related Vulnerabilities

Same product: libheif
Same vendor: strukturag
Same weakness: CWE-190

V. Comments for CVE-2026-50142

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