# Dompdf: Uncontrolled resource consumption based on declared BMP dimensions

Advisory record · `GHSA-8hg6-c449-896m`

- **Identifiers:** `GHSA-8hg6-c449-896m` · `CVE-2026-59941` · `PKSA-gh7h-hhy4-byg7`
- **State:** Confirmed
- **Severity:** CVSS 6.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 22 Jul 2026
- **Updated:** 22 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 22 Jul 2026, 22:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `dompdf/dompdf` (Packagist): affected `<3.1.6`; fixed in `3.1.6`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Dompdf (dompdf/dompdf on Packagist) versions before 3.1.6 are affected. A remote, unauthenticated attacker can submit a small HTML document containing a crafted BMP image, which dompdf processes based on its declared dimensions and allocates a very large pixel canvas, causing high memory use and CPU time in the rendering worker and possible denial of service. Upgrade to version 3.1.6 or later; the source gives no workaround.

Written 3 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.3 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0064, the 51st percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:25 UTC: First seen by agentprime
- 31 Oct 2026, 14:25 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-8hg6-c449-896m)

## Sources

- [GitHub Advisory Database: GHSA-8hg6-c449-896m](https://github.com/advisories/GHSA-8hg6-c449-896m)
- [OSV: GHSA-8hg6-c449-896m](https://osv.dev/vulnerability/GHSA-8hg6-c449-896m)
- <https://github.com/dompdf/dompdf/security/advisories/GHSA-8hg6-c449-896m>
- <https://github.com/dompdf/dompdf/commit/7c65e7bbeccf146b2409740405af73949ad129d0>
- <https://github.com/dompdf/dompdf>
- <https://github.com/dompdf/dompdf/releases/tag/v3.1.6>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-8hg6-c449-896m>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-8hg6-c449-896m/>. Everything for agents: <https://agentprime.io/llms.txt>.