fulgur-rs Fulgur up to 0.26.x CSS Counter Resolution counters name/sep memory allocation

Summaryinfo

A vulnerability classified as problematic was found in fulgur-rs Fulgur up to 0.26.x. Affected by this vulnerability is the function counters of the component CSS Counter Resolution. The manipulation of the argument name/sep results in memory allocation. This vulnerability was named CVE-2026-68538. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in fulgur-rs Fulgur up to 0.26.x. It has been classified as problematic. Affected is the function counters of the component CSS Counter Resolution. The manipulation of the argument name/sep with an unknown input leads to a memory allocation vulnerability. CWE is classifying the issue as CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. This is going to have an impact on availability. CVE summarizes:

fulgur converts untrusted HTML/CSS into PDF, commonly on a server that processes input supplied by many tenants. From version 0.15.0 to before version 0.27.0, resolving the CSS counters(name, sep) function in generated content was bounded neither in the size of a single expansion nor in the aggregate work across an element tree. An attacker able to submit HTML/CSS to a fulgur-based conversion service can trigger CPU and memory exhaustion with a trivially small payload, denying service to the host and any co-tenants. This issue has been patched in version 0.27.0.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-68538 since 07/30/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 0.27.0 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
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26

Website

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

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