fulgur-rs fulgur up to 0.18.x PDF Slicing out-of-bounds write

Summaryinfo

A vulnerability has been found in fulgur-rs fulgur up to 0.18.x and classified as problematic. Affected by this issue is some unknown functionality of the component PDF Slicing. Performing a manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2026-68523. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in fulgur-rs fulgur up to 0.18.x. It has been classified as problematic. This affects an unknown part of the component PDF Slicing. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on availability. The summary by CVE is:

`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 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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-68523 since 07/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.19.0 eliminates this vulnerability.

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Productinfo

Vendor

• fulgur-rs

Name

• fulgur

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18

Website

• Product: https://github.com/fulgur-rs/fulgur/

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