CVE-2026-68539: DoS (CVSS 7.5)

Description

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0067

Probability of exploitation

0.52%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-770 CWE-770

References

Other References

https://github.com/fulgur-rs/fulgur/commit/1c4cdad003daef7c9dc6ef1362c50bcfaac13ea9 https://github.com/fulgur-rs/fulgur/commit/9248fbfd91a2ba8fc3dbd9e44ba681f52ed1ecd0 https://github.com/fulgur-rs/fulgur/pull/582 https://github.com/fulgur-rs/fulgur/pull/584 https://github.com/fulgur-rs/fulgur/releases/tag/v0.29.0 https://github.com/fulgur-rs/fulgur/security/advisories/GHSA-vw2v-g4x7-xcqg

Frequently Asked Questions

What is CVE-2026-68539? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-68539? +

CVE-2026-68539 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0067, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-68539? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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