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CVE-2026-84451— libheif: Incomplete fix for CVE-2026-62292 leaves libheif vulnerable to an out-of-bounds read

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 is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.3, the no-icef full-item branch of unc_decoder::get_compressed_image_data_uncompressed() in libheif/codecs/uncompressed/unc_decoder.cc retains an addition-based range check that

CVSS 6.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif >= 1.19.0, < 1.23.3 affected
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I. Basic Information for CVE-2026-84451

Vulnerability Information

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Vulnerability Title
libheif: Incomplete fix for CVE-2026-62292 leaves libheif vulnerable to an out-of-bounds read
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.3, the no-icef full-item branch of unc_decoder::get_compressed_image_data_uncompressed() in libheif/codecs/uncompressed/unc_decoder.cc retains an addition-based range check that can wrap when a crafted uncompressed tile grid produces a large range_start_offset and range_size. The overflow makes the bounds comparison pass and allows heif_image_handle_decode_image_tile() to call memcpy() with an invalid source pointer and a very large length when decoding a valid high-index advertised tile. This incomplete remediation of CVE-2026-62292 can reliably crash tile-processing applications, while whole-image decoding is not claimed to reach the demonstrated path. This issue is fixed in version 1.23.3.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libheif >= 1.19.0, < 1.23.3 -

II. Public POCs for CVE-2026-84451

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III. Intelligence Information for CVE-2026-84451

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Patches & Fixes for CVE-2026-84451 (1)

Other References for CVE-2026-84451 (2)

Same Patch Batch · strukturag · 2026-09-18 · 9 CVEs total

CVE-2026-84383 9.8 CRITICAL libheif: Heap buffer overflow in `scale_nearest_neighbor()` via duplicate Alpha planes fro
CVE-2026-84447 7.5 HIGH libheif: Derived-image indirect reference chains and tiled offsets bypass decode caching a
CVE-2026-84446 7.5 HIGH libheif: Sequence decode timing-table initialization allows non-terminating loops and unbo
CVE-2026-84384 7.5 HIGH libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-b
CVE-2026-84444 7.4 HIGH libheif uncompressed tiled image encoding allows out-of-bounds write
CVE-2026-84450 4.3 MEDIUM libheif: `clap` + oversized `ispe` aborts on an assert in `Fraction::Fraction` (incomplete
CVE-2026-84448 4.0 MEDIUM libheif: Heap out-of-bounds read in libheif inline-mask region API (heif_region_item_add_r
CVE-2026-84449 3.7 LOW libheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-84451

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