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RUSTSEC-2026-0200
No affected components available
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.
The height is taken directly from attacker-controlled HTML/CSS (height, vh
units), so a few bytes such as <div style="height:99999999px"></div> forced on
the order of 125,000 page fragments. The pagination code then allocates
vec![Vec::new(); page_count] and runs a per-page render loop, resulting in CPU
and memory exhaustion. A non-finite height (one that resolves to +inf)
additionally made the slicing loop's remaining -= last_slice_h decrement never
terminate, causing an infinite loop.
An attacker able to submit HTML/CSS to a fulgur-based conversion service can trigger this with a trivially small payload, denying service to the host and any co-tenants.
Fixed in 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.
Attack Vector rationale
fulgur performs no network I/O of its own; it renders HTML/CSS handed to it by
the embedding application. This advisory scores the crate independent of any
specific adopting program, so per the CVSS v3.1 User Guide §3.7 the Attack
Vector is assessed as Network for the reasonable worst-case deployment — a
network-facing service that renders untrusted HTML without user interaction. A
concrete system that receives the HTML in one component and passes it to fulgur
in a separate component may assess a lower environmental Attack Vector (Local,
per §3.10).
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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