# CVE-2026-48029: libheif: heap OOB read in ImageItem_Grid::decode_grid_tile via irot-induced tile-coordinate underflow

> A heap out-of-bounds read in libheif allows attackers to cause denial of service or disclose memory contents via crafted image files.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 22 Jul 2026
- **Updated:** 22 Jul 2026
- **Also known as:** BELL-CVE-2026-48029, DEBIAN-CVE-2026-48029, ECHO-f301-3bae-8fc2, GHSA-6x5f-qchq-cxqv, JLSEC-2026-1193, ROOT-OS-DEBIAN-12-CVE-2026-48029, UBUNTU-CVE-2026-48029

## What is CVE-2026-48029?

CVE-2026-48029 is a high-severity memory corruption vulnerability in strukturag libheif, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.19.0 through 1.21.2 have a heap OOB read in ImageItem_Grid::decode_grid_tile via irot-induced tile-coordinate underflow. Version 1.22.0 fixes the issue.

Weakness: CWE-191 (Integer Underflow (Wrap or Wraparound)), CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-48029?

It affects 1 product.


Products: Struktur Libheif.

## How do I fix CVE-2026-48029?

Upgrade to a fixed version.

## Is CVE-2026-48029 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48029 exists.

## Other vulnerabilities in strukturag libheif

- [CVE-2026-32740](https://insights.sbomify.com/CVE-2026-32740/): libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing (high 8.8)
- [CVE-2023-49460](https://insights.sbomify.com/CVE-2023-49460/): Null dereference in n/a (high 8.8)
- [CVE-2023-49462](https://insights.sbomify.com/CVE-2023-49462/): Null dereference in n/a (high 8.8)
- [CVE-2023-49463](https://insights.sbomify.com/CVE-2023-49463/): Null dereference in n/a (high 8.8)
- [CVE-2023-49464](https://insights.sbomify.com/CVE-2023-49464/): Null dereference in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48029 and fix it if it is affected.

What it is: CVE-2026-48029 is a high-severity memory corruption vulnerability in strukturag libheif, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48029 exists.

Affected product: strukturag libheif. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-48029/ (Markdown: https://insights.sbomify.com/CVE-2026-48029/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48029
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48029
- OSV: https://osv.dev/vulnerability/CVE-2026-48029

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48029/
Summaries are generated and may contain mistakes; the official description above is the record.