# CVE-2026-62292 — strukturag libheif

> As of 2026-08-18, CVE-2026-62292 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in strukturag libheif, CVSS v4.0 8.7, EPSS 0.5% (43.0th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-62292 as of 2026-08-18; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-18

## What is CVE-2026-62292?

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.1, a crafted uncompressed HEIF image using generic zlib unci full-item compression can crash an application that decodes an advertised tile with heif_image_handle_decode_image_tile(). In libheif/codecs/uncompressed/unc_decoder.cc, unc_decoder::fetch_tile_data() computes a large tile offset and unc_decoder::get_compressed_image_data_uncompressed() validates it with range_start_offset plus range_size. For the last advertised tile (4095, 4095), the addition can wrap to zero, bypass the bounds check, and pass an invalid source pointer and a one-terabyte length to memcpy. The observed result is an out-of-bounds read and process crash; opening the file alone does not trigger the issue because tile decoding is required. This issue is fixed in version 1.23.1.

The record classifies CVE-2026-62292 under weakness class [CWE-125](https://cwe.mitre.org/data/definitions/125.html). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 31 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 8.7 — High (derived from score) (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.5% probability of exploitation in the next 30 days, higher than 43.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 8.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-18

## Is CVE-2026-62292 being exploited?

Weaponised exploit code for CVE-2026-62292 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 49 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-62292.md) (trickest)

## Affected products and versions

- **strukturag**: libheif

## How to fix CVE-2026-62292

No vendor patch reference has been recorded for CVE-2026-62292 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-62292

No threat campaign in the Threadlinqs corpus currently references CVE-2026-62292, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-08-19. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/strukturag/libheif/security/advisories/GHSA-73p7-m7gg-w2jv)

**Other references**

- [github.com](https://github.com/strukturag/libheif/commit/089a809bf6bed1abae102d5e97b6bb8c4f53b515)
- [github.com (v1.23)](https://github.com/strukturag/libheif/releases/tag/v1.23.1)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-62292
Full detection coverage and IOCs for threats exploiting CVE-2026-62292 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp