# CVE-2026-56367: ImageMagick - Heap Out-of-Bounds Read in PSB RLE Decoding

> An integer overflow in ImageMagick's PSB RLE decoding allows attackers to cause heap out-of-bounds reads, leading to information disclosure or crashes.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Jun 2026
- **Updated:** 22 Jun 2026
- **Also known as:** CLSA-2026-1791459583, DEBIAN-CVE-2026-56367, ECHO-0df6-8de2-95bc, GHSA-rg39-4fm5-hrp2, JLSEC-2026-1048, UBUNTU-CVE-2026-56367

## What is CVE-2026-56367?

CVE-2026-56367 is a medium-severity vulnerability in Imagemagick Imagemagick, published on 21 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ImageMagick before 7.1.2-15 and 6.9.x before 6.9.13-40 contains an integer overflow in the PSB (PSD v2) RLE decoding path (ReadPSDChannelRLE in coders/psd.c) that causes a heap out-of-bounds read on 32-bit builds. Processing a crafted PSB file can lead to information disclosure or a crash.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-56367?

It affects 1 product.


Products: Imagemagick Imagemagick.

## How do I fix CVE-2026-56367?

Upgrade to a fixed version.

## Is CVE-2026-56367 being exploited?

There is no known exploitation of CVE-2026-56367 in the wild and no public exploit code.

## Other vulnerabilities in Imagemagick Imagemagick

- [CVE-2019-19952](https://insights.sbomify.com/CVE-2019-19952/): Use after free in n/a (critical 9.8)
- [CVE-2018-16328](https://insights.sbomify.com/CVE-2018-16328/): Null dereference in n/a (critical 9.8)
- [CVE-2018-16329](https://insights.sbomify.com/CVE-2018-16329/): Null dereference in n/a (critical 9.8)
- [CVE-2017-18210](https://insights.sbomify.com/CVE-2017-18210/): Null dereference in n/a (critical 9.8)
- [CVE-2017-14138](https://insights.sbomify.com/CVE-2017-14138/): Denial of service in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56367 and fix it if it is affected.

What it is: CVE-2026-56367 is a medium-severity vulnerability in Imagemagick Imagemagick, published on 21 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-56367 in the wild and no public exploit code.

Affected product: Imagemagick Imagemagick. 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-2026-56367/ (Markdown: https://insights.sbomify.com/CVE-2026-56367/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56367
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56367
- OSV: https://osv.dev/vulnerability/CVE-2026-56367

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-56367/
Summaries are generated and may contain mistakes; the official description above is the record.