Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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.

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 Trac

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libheif < 1.23.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-84446

Vulnerability Information

Shenlong is analyzing...

Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-84446

请登录查看更多情报信息。

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

V. Comments for CVE-2026-84446

No comments yet

Leave a comment