Quick answers
- Is CVE-2026-68749 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-68749 being exploited in the wild.
- How severe is CVE-2026-68749?
- High severity, with a CVSS score of 7.5, published 6 August 2026.
- Which products and versions are affected?
- Rrrene Html Sanitize Ex 0.3.1 to <1.4.5 and 1.5.0-rc.0 to <1.5.3.
- Is there a fix for CVE-2026-68749?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-68749 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-68749?
- Check whether you run Rrrene Html Sanitize Ex or Rrrene Htmlsanitizeex 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.
Technical details
This is a Regular Expression Denial of Service (ReDoS) vulnerability in the CSS property regex matcher within HtmlSanitizeEx.Scrubber.CSS.scrub/1. The vulnerable regex uses an unbounded greedy quantifier ([-\w]+) followed by a mandatory colon, causing catastrophic backtracking when matching a long run of word characters not followed by a colon. The regex engine tries matching at every offset, resulting in quadratic time complexity relative to CSS length. An unauthenticated attacker can send an 80 KB CSS declaration that consumes ~2.4 seconds of CPU per request; multiple concurrent requests saturate the BEAM scheduler and render the application unresponsive. No data exfiltration or code execution occurs; impact is CPU exhaustion only.
Affected products
- rrrene html_sanitize_ex 0.3.1 to <1.4.5 and 1.5.0-rc.0 to <1.5.3
Timeline
- 2026-08-06: disclosed
- 2026-08-06: advisory: CVE-2026-68749 published