CVE-2026-62291— libheif: Heap out of bounds write in libheif uncompressed encoder when writing images with mismatched auxiliary alpha dimensions
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之前版本存在缓冲区错误漏洞，该漏洞源于在解码和重新编码工作流中未检查辅助alpha平面尺寸与主帧匹配，导致越界写入或越界读取，攻击者可通过特制图像序列导致堆损坏。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| strukturag | libheif | < 1.23.1 |
affected |
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I. Basic Information for CVE-2026-62291
Vulnerability Information
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Vulnerability Title
libheif: Heap out of bounds write in libheif uncompressed encoder when writing images with mismatched auxiliary alpha dimensions
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 image sequence with a 2x2 primary plane and a 256x256 auxiliary alpha plane can cause attacker-controlled heap corruption during a normal decode and re-encode workflow. Track_Visual::decode_next_image_sample() calls transfer_channel_from_image_as() without checking that the auxiliary alpha dimensions match the main frame. The resulting inconsistent image reaches heif_track_decode_next_image() and then heif_context_encode_image(). In unc_encoder::encode(), unc_encoder_component_interleave::encode_tile() sizes its buffer with compute_tile_data_size_bytes() using the primary dimensions but copies each component using its actual plane dimensions. The oversized alpha plane is therefore copied beyond the allocation, causing an out-of-bounds write; the inverse size mismatch can also produce an out-of-bounds read. This issue is fixed in version 1.23.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
struktur AG libheif 缓冲区错误漏洞
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 1.23.1之前版本存在缓冲区错误漏洞，该漏洞源于在解码和重新编码工作流中未检查辅助alpha平面尺寸与主帧匹配，导致越界写入或越界读取，攻击者可通过特制图像序列导致堆损坏。
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-2026-62291
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-62291 (1)
Vendor Advisories for CVE-2026-62291 (1)
Other References for CVE-2026-62291 (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-2026-62289 | 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
-
CVE-2026-62377
libheif: Reachable assertion in HeifContext::get_track() abo -
CVE-2026-62292
libheif: Out-of-bounds read in uncompressed unci tile range -
CVE-2026-62289
libheif: Integer underflow in Fraction constructor via doubl -
CVE-2026-50142
libheif: unbounded heap allocation in HEIF sequence parser ( -
CVE-2026-48029
libheif: heap OOB read in ImageItem_Grid::decode_grid_tile v
Same vendor: strukturag
-
CVE-2026-62377
libheif: Reachable assertion in HeifContext::get_track() abo -
CVE-2026-62292
libheif: Out-of-bounds read in uncompressed unci tile range -
CVE-2026-62289
libheif: Integer underflow in Fraction constructor via doubl -
CVE-2026-50142
libheif: unbounded heap allocation in HEIF sequence parser ( -
CVE-2026-48029
libheif: heap OOB read in ImageItem_Grid::decode_grid_tile v
Same weakness: CWE-125
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Systerel S2OPC AddNodes Service sopc_node_mgt_helper_interna -
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mod_auth_openidc has out-of-bounds read and write in state c -
CVE-2026-50278
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CVE-2026-18716
Vulnerabilities in IBM AIX and PowerVM VIOS -
CVE-2026-17423
Vulnerabilities in IBM AIX and PowerVM VIOS
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