Threats Tagged 'cve-2026-68749'

CVE-2026-68749 is a high-severity vulnerability in the rrrene html_sanitize_ex library that causes inefficient regular expression complexity in its CSS scrubber. An unauthenticated remote attacker can exploit this by sending a long CSS declaration that triggers excessive CPU usage during HTML sanitization, leading to denial of service. The vulnerability arises from a regex pattern that matches property names greedily without length limits, causing quadratic time complexity. This results in CPU exhaustion but does not lead to data disclosure or modification. The affected versions are from 0.3.1 up to but not including 1.5.3, including 1.5.0-rc.0. No patch information is provided in the source data.

Inefficient Regular Expression Complexity vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to exhaust server CPU via a long CSS declaration in sanitized HTML. The declaration regex in HtmlSanitizeEx.Scrubber.CSS.scrub/1 matches the property name with an unbounded greedy [-\w]+ followed by a mandatory :, so a long run of word characters not followed by a colon makes the engine give back one character at a time and retry the colon at every start offset. The work is quadratic in the length of the run, and no length cap is applied to the CSS handed to the scrubber. An 80 KB <style> body costs roughly 2.4 seconds of scheduler time, so a few concurrent requests saturate the BEAM scheduler pool and make the application unresponsive. The impact is CPU exhaustion only. Nothing is read, modified or disclosed. This issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3.