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CVE-2026-84444— libheif uncompressed tiled image encoding allows out-of-bounds write

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. Prior to 1.23.2, when WITH_UNCOMPRESSED_CODEC is enabled, heif_context_add_image_tile() accepts an independently constructed tile whose component-plane dimensions do not match the tile geometry establ

CVSS 7.4 · High
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I. Basic Information for CVE-2026-84444

Vulnerability Information

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Vulnerability Title
libheif uncompressed tiled image encoding allows out-of-bounds write
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, when WITH_UNCOMPRESSED_CODEC is enabled, heif_context_add_image_tile() accepts an independently constructed tile whose component-plane dimensions do not match the tile geometry established by the prototype image. ImageItem_uncompressed::add_image_tile() passes that tile directly to unc_encoder::encode_tile(), which lacked the check_component_sizes() gate and sizes its output from the configured tile geometry while copying the tile's actual component-plane dimensions. An oversized component plane can therefore make unc_encoder_component_interleave::encode_tile() copy attacker-controlled data beyond the heap output buffer. This issue is fixed in version 1.23.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libheif < 1.23.2 -

II. Public POCs for CVE-2026-84444

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III. Intelligence Information for CVE-2026-84444

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Patches & Fixes for CVE-2026-84444 (1)

Other References for CVE-2026-84444 (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-2026-84451 6.5 MEDIUM libheif: Incomplete fix for CVE-2026-62292 leaves libheif vulnerable to an out-of-bounds r
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-787

V. Comments for CVE-2026-84444

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