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CVE-2026-49271— libheif: Wrapped icef compressed-unit range check causes out-of-bounds read in uncompressed HEIF decoder

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.

strukturag libheif是strukturag的图像编解码库。 strukturag libheif 1.22.1之前版本存在缓冲区错误漏洞，该漏洞源于未压缩HEIF解码器使用unit_offset + unit_size验证显式icef压缩单元偏移时加法可导致回绕，可能使特制HEIF文件通过范围检查并构造超出压缩项目缓冲区的迭代器，从而产生越界堆读取和崩溃。

CVSS 6.5 · Medium EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.22.1 affected
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I. Basic Information for CVE-2026-49271

Vulnerability Information
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Vulnerability Title
libheif: Wrapped icef compressed-unit range check causes out-of-bounds read in uncompressed HEIF decoder
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unit_offset + unit_size. Because the addition can wrap, a crafted HEIF file can pass the range check and then construct a vector from iterators outside the compressed item buffer, producing an out-of-bounds heap read and crash. Version 1.22.1 patches the issue.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
strukturag libheif 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
strukturag libheif是strukturag的图像编解码库。 strukturag libheif 1.22.1之前版本存在缓冲区错误漏洞，该漏洞源于未压缩HEIF解码器使用unit_offset + unit_size验证显式icef压缩单元偏移时加法可导致回绕，可能使特制HEIF文件通过范围检查并构造超出压缩项目缓冲区的迭代器，从而产生越界堆读取和崩溃。
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 < 1.22.1 -

II. Public POCs for CVE-2026-49271

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III. Intelligence Information for CVE-2026-49271

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Vendor Advisories for CVE-2026-49271 (1)

Same Patch Batch · strukturag · 2026-06-19 · 4 CVEs total

CVE-2026-49346 7.1 HIGH libde265 has a heap buffer overflow in de265_image_get_buffer via SPS dimension integer ov
CVE-2026-49295 7.1 HIGH libde265 has an out-of-bounds write in process_reference_picture_set via predicted short-t
CVE-2026-49337 4.3 MEDIUM libde265 has an unbounded memory leak via orphaned slice headers in `read_slice_NAL`

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-49271

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