Vulnerability · Published Sep 17, 2026 · Assigned by GitHub_M
CVE-2026-68537Fulgur: Unbounded page slicing from attacker-controlled CSS height causes denial of service
High 7.5
In plain English
A high-severity uncontrolled resource consumption in fulgur from fulgur-rs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Official description
`fulgur` converts untrusted HTML/CSS into PDF, commonly on a server that processes input supplied by many tenants. In versions prior to 0.19.0, a body-direct child whose CSS-resolved height greatly exceeds the page height was sliced into one fragment per page with no upper bound. This is fixed in version 0.19.0. A `MAX_PAGES` cap bounds the slice loop — halting it even for a `+inf` height — and non-finite layout heights are sanitized so they can no longer drive the loop. As a workaround, validate or constrain untrusted CSS (in particular `height` / `vh` on body-level elements) before passing HTML to fulgur.
Affected products (as reported)
Weakness: CWE-400, CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/fulgur-rs/fulgur/security/advisories/GHSA-4rf6-qx84-q9fv x_refsource_CONFIRM
- https://github.com/fulgur-rs/fulgur/pull/501 x_refsource_MISC
- https://rustsec.org/advisories/RUSTSEC-2026-0200.html x_refsource_MISC