Is CVE-2026-68539 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-68539 being exploited in the wild.

How severe is CVE-2026-68539?

High severity, with a CVSS score of 7.5, published 11 November 2026.

Which products and versions are affected?

Fulgur-Rs Fulgur 0.4.4 to before 0.29.0.

Is there a fix for CVE-2026-68539?

Yes: fixed in 0.29.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-68539 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-68539?

Check whether you run Fulgur-Rs Fulgur at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-68539: fulgur denial of service via unbudgeted CSS named-string values

CVE-2026-68539 · Severity: high · CVSS 7.5 · Published 2026-11-11

fulgur is a library that converts HTML and CSS documents into PDF files, often used to process documents from multiple users on shared servers. An attacker can craft a small HTML document with malicious CSS that causes fulgur to accumulate unbounded amounts of memory and CPU, denying the service to other users. The vulnerability exists in versions 0.4.4 through 0.28.x and has been fixed in version 0.29.0.

Technologies: Fulgur-Rs Fulgur. Vendors: Fulgur-Rs.

Quick answers

Is CVE-2026-68539 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-68539 being exploited in the wild.
How severe is CVE-2026-68539?: High severity, with a CVSS score of 7.5, published 11 November 2026.
Which products and versions are affected?: Fulgur-Rs Fulgur 0.4.4 to before 0.29.0.
Is there a fix for CVE-2026-68539?: Yes: fixed in 0.29.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-68539 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-68539?: Check whether you run Fulgur-Rs Fulgur at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 0.29.0

Technical details

The vulnerability is a denial-of-service caused by unbudgeted accumulation of CSS string-set named-string values in the StringSetPass component. When processing CSS, the library accumulated per-element snapshots of named-string values with no memory limit, allowing an attacker to amplify a small crafted document into large retained memory and CPU overhead. The fix introduces memory budgets (MAX_STRING_SNAPSHOT_BYTES) to bound string-set snapshot storage and running-map memory consumption.

Affected products

fulgur-rs fulgur 0.4.4 to before 0.29.0

Timeline

2026-11-11: disclosed
2026-07-06: patched

References

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