---
id: "CVE-2026-68539"
page: "https://infrastack.ai/live/CVE-2026-68539"
kind: "vulnerability"
aliases: ["CVE-2026-68539"]
title: "fulgur: crafted HTML/CSS document exhausts server memory and CPU"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["multi-tenant", "package", "pdf-generation", "server-side-rendering"]
not_affected_if: ["trusted-input-only", "versions-outside-range"]
published_at: "2026-11-11T22:17:30+00:00"
first_seen_at: "2026-11-11T22:29:35+00:00"
updated_at: "2026-11-11T22:31:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68539", "first_seen_at": "2026-11-11T22:29:35+00:00"}]
exploit_sources: []
---

# fulgur: crafted HTML/CSS document exhausts server memory and CPU

Link for people: https://infrastack.ai/live/CVE-2026-68539 (this .md is for agents)

fulgur is a library that converts HTML and CSS into PDF files. A small crafted document makes it accumulate unbounded memory and CPU work, so an attacker can cause a denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the fulgur version in your lockfile or Cargo manifest; affected versions are `0.4.4` up to but not including `0.29.0`
- Find whether your service passes untrusted HTML or CSS to fulgur for PDF rendering

## Fix

- fulgur: upgrade to `0.29.0` or later

## Timeline

- 2026-11-11T22:29:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-68539

## Documents

- [advisory] Vendor advisory: github.com https://github.com/fulgur-rs/fulgur/security/advisories/GHSA-vw2v-g4x7-xcqg
- [fix] Patch: github.com https://github.com/fulgur-rs/fulgur/commit/1c4cdad003daef7c9dc6ef1362c50bcfaac13ea9
- [fix] Patch: github.com https://github.com/fulgur-rs/fulgur/commit/9248fbfd91a2ba8fc3dbd9e44ba681f52ed1ecd0
- [fix] Release notes: github.com https://github.com/fulgur-rs/fulgur/releases/tag/v0.29.0

## From the sources

fulgur converts untrusted HTML/CSS into PDF, commonly on a server that processes input supplied by many tenants. From version 0.4.4 to before version 0.29.0, the CSS string-set named-string values resolved from a document were accumulated per element with no memory budget, letting a small crafted document amplify into large retained memory (and the CPU to copy it) — results in a denial of service. This issue has been patched in version 0.29.0.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_