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CVE-2026-84446— libheif: Sequence decode timing-table initialization allows non-terminating loops and unbounded memory, bypassing max_sequence_frames

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.

翻译如下： libheif 是一款用于解码和编码 HEIF 和 AVIF 文件格式的库。在 1.23.2 版本之前，精心构造的 HEIF 序列时序和编辑列表数据可能使 计算出超过 和 所使用的 计数器容量的 逻辑值。这导致相关比较永远无法达到过大的输出样本数，从而引发解码或原始样本循环无法终止，并绕过 的限制。同一序列处理路径还重复调用 ，并在 的内存统计之外分配 和 ，使得仅通过一个小文件即可造成严重的 CPU 和内存耗尽。该问题已在 1.23.2 版本中修复。

CVSS 7.5 · High EPSS 0.46% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.23.2 affected
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I. Basic Information for CVE-2026-84446

Vulnerability Information
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Vulnerability Title
libheif: Sequence decode timing-table initialization allows non-terminating loops and unbounded memory, bypassing max_sequence_frames
Source: CVE Program / CVE List V5
Vulnerability Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, crafted HEIF sequence timing and edit-list data can make Track::init_sample_timing_table() compute a logical m_num_output_samples value that exceeds the uint32_t counters used by Track_Visual::decode_next_image_sample() and Track::get_next_sample_raw_data(). The resulting comparison can never reach the oversized output count, causing non-terminating decode or raw-sample loops and bypassing max_sequence_frames. The same sequence path repeatedly calls Box_stts::get_sample_duration() and allocates Chunk::m_sample_ranges and Track::m_presentation_timeline outside MemoryHandle accounting, allowing severe CPU and memory exhaustion from a small file. This issue is fixed in version 1.23.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libheif < 1.23.2 -

II. Public POCs for CVE-2026-84446

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III. Intelligence Information for CVE-2026-84446

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Patches & Fixes for CVE-2026-84446 (1)

Other References for CVE-2026-84446 (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-2026-84384 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-2026-84451 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-835