# CVE-2026-68539: fulgur: Unbounded string-set value accumulation 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 0.4.4 to before version 0.29.0, the CSS string-set named-string values resolved from a document were accumulated per element with no memory budget, letting a small crafted document amplify into large retained memory (and the CPU to copy it) — results in a denial of service. This issue has been patched in version 0.29.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- fulgur-rs / fulgur: >= 0.4.4, < 0.29.0 (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, CWE-770

## 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-vw2v-g4x7-xcqg (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/fulgur-rs/fulgur/pull/582 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/fulgur-rs/fulgur/pull/584 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/fulgur-rs/fulgur/commit/1c4cdad003daef7c9dc6ef1362c50bcfaac13ea9 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/fulgur-rs/fulgur/commit/9248fbfd91a2ba8fc3dbd9e44ba681f52ed1ecd0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/fulgur-rs/fulgur/releases/tag/v0.29.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/fulgur-rs/fulgur/commit/1c4cdad003daef7c9dc6ef1362c50bcfaac13ea9 (security-advisories@github.com)

- https://github.com/fulgur-rs/fulgur/commit/9248fbfd91a2ba8fc3dbd9e44ba681f52ed1ecd0 (security-advisories@github.com)

- https://github.com/fulgur-rs/fulgur/pull/582 (security-advisories@github.com)

- https://github.com/fulgur-rs/fulgur/pull/584 (security-advisories@github.com)

- https://github.com/fulgur-rs/fulgur/releases/tag/v0.29.0 (security-advisories@github.com)

- https://github.com/fulgur-rs/fulgur/security/advisories/GHSA-vw2v-g4x7-xcqg (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-68539; retrieved 2026-11-11; source updated 2026-11-11

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68539; retrieved 2026-11-12; source updated 2026-11-11

Revision: 3484759dec4f3b517db7fd4bfa4af2cb6490a2c5c3a45910020644f20702efd4

Canonical: https://y2.dev/cve/CVE-2026-68539

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