CVE-2026-62377— libheif: Reachable assertion in HeifContext::get_track() aborts on a valid-but-empty HEIF sequence file (context.cc:2110)
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.
struktur AG libheif是struktur AG组织的一款图像编解码库。 struktur AG libheif 1.23.1之前版本存在安全漏洞，该漏洞源于heif_context_read_from_memory()处理特制HEIF序列时未正确注册序列轨道，导致调用heif_context_get_track(ctx, 0)时触发断言或空指针解引用，造成崩溃。
Possible ATT&CK Techniques 3 AI
T1189 · Drive-by Compromise T1190 · Exploit Public-Facing Application T1200 · Hardware AdditionsAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| strukturag | libheif | < 1.23.1 |
affected |
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I. Basic Information for CVE-2026-62377
Vulnerability Information
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Vulnerability Title
libheif: Reachable assertion in HeifContext::get_track() aborts on a valid-but-empty HEIF sequence file (context.cc:2110)
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted HEIF sequence accepted by heif_context_read_from_memory() can leave the context with no registered sequence tracks and crash when heif_context_get_track(ctx, 0) is called. HeifContext::get_track() in libheif/context.cc executes assert(has_sequence()) before its normal error handling, so assert-enabled builds abort instead of allowing the public wrapper in libheif/api/libheif/heif_sequences.cc to return null. In release builds, removing the assertion lets the track_id zero path dereference m_tracks.begin()->second on an empty map, which is undefined behavior and typically crashes. The issue is reachable through documented public APIs after parsing attacker-controlled bytes. This issue is fixed in version 1.23.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
struktur AG libheif 异常处理不当漏洞
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 1.23.1之前版本存在安全漏洞，该漏洞源于heif_context_read_from_memory()处理特制HEIF序列时未正确注册序列轨道，导致调用heif_context_get_track(ctx, 0)时触发断言或空指针解引用，造成崩溃。
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 | < 1.23.1 | - |
|
II. Public POCs for CVE-2026-62377
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-62377 (1)
Vendor Advisories for CVE-2026-62377 (1)
Proof of Concept for CVE-2026-62377 (1)
Other References for CVE-2026-62377 (1)
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🔗 Release v1.23.1 · strukturag/libheif · GitHub x_refsource_MISC
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-2026-50142 | 7.5 HIGH | libheif: unbounded heap allocation in HEIF sequence parser (stsz fixed-size mode missing b |
| 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 |
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V. Comments for CVE-2026-62377
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