# CVE-2026-68538: fulgur: Unbounded counters() expansion in generated content causes memory/CPU exhaustion (denial of service)

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- fulgur-rs / fulgur: >= 0.15.0, < 0.27.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-400

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/fulgur-rs/fulgur/security/advisories/GHSA-395p-pj7r-jm42 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/fulgur-rs/fulgur/commit/ebc75691ad368f1c1a211543313b04da2af466d6 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/fulgur-rs/fulgur/releases/tag/v0.27.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/fulgur-rs/fulgur/commit/ebc75691ad368f1c1a211543313b04da2af466d6 (security-advisories@github.com)

- https://github.com/fulgur-rs/fulgur/releases/tag/v0.27.0 (security-advisories@github.com)

- https://github.com/fulgur-rs/fulgur/security/advisories/GHSA-395p-pj7r-jm42 (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-68538; retrieved 2026-11-11; source updated 2026-11-11

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68538; retrieved 2026-11-12; source updated 2026-11-11

Revision: 73b3737cd089821240298e7c5445cab6ae6bc2266ce2eb406ae66155e73eb0be

Canonical: https://y2.dev/cve/CVE-2026-68538

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