Quick answers
- Is CVE-2026-68540 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-68540 being exploited in the wild.
- How severe is CVE-2026-68540?
- High severity, with a CVSS score of 7.5, published 11 November 2026.
- Which products and versions are affected?
- Fulgur-Rs Fulgur 0.6.0 to before 0.33.0.
- Is there a fix for CVE-2026-68540?
- Yes: fixed in 0.33.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-68540 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-68540?
- 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: 0.33.0
Technical details
The vulnerability exists in the `cb_padding_box` function within the positioned.rs module, which was unnecessarily calling `extract_block_style()` to obtain border widths during containing-block resolution for absolutely-positioned pseudo-elements. This full style extraction triggered cloning and iteration of `box-shadow` lists as a side effect, and the containing-block resolution walk multiplied this processing across ancestors for each affected pseudo-element. An attacker can provide a document with many absolutely-positioned ::before/::after pseudo-elements whose ancestors have complex box-shadow properties, causing quadratic computational complexity and denial of service.
Affected products
- fulgur-rs fulgur 0.6.0 to before 0.33.0
Timeline
- 2026-11-11: disclosed