Answer in brief
CVE-2026-68749 records a High severity (CVSS 8.2) vulnerability in Quadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion denial of service. The current sources do not mark it as known exploited. The current feed maps rrrene/html_sanitize_ex (generic), rrrene/html_sanitize_ex (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps rrrene/html_sanitize_ex (generic), rrrene/html_sanitize_ex (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| rrrene/html_sanitize_exgeneric | >=0.3.1 <1.5.3 | 1.5.3 |
| rrrene/html_sanitize_exgeneric | >=21f90012eb21aa36f4e3701b7547e12faf0f3c8b <4f4bd9eb254881462c0461fbab74b29188c2c133 | 4f4bd9eb254881462c0461fbab74b29188c2c133 |
Published upstream
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 6, 2026
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 1.5.3.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-68749 records a High severity (CVSS 8.2) vulnerability in Quadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion denial of service. The current sources do not mark it as known exploited. The current feed maps rrrene/html_sanitize_ex (generic), rrrene/html_sanitize_ex (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps rrrene/html_sanitize_ex (generic), rrrene/html_sanitize_ex (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| rrrene/html_sanitize_exgeneric | >=0.3.1 <1.5.3 | 1.5.3 |
| rrrene/html_sanitize_exgeneric | >=21f90012eb21aa36f4e3701b7547e12faf0f3c8b <4f4bd9eb254881462c0461fbab74b29188c2c133 | 4f4bd9eb254881462c0461fbab74b29188c2c133 |
Published upstream
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 6, 2026
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 1.5.3.
Quoted source text, attributed separately from HOL analysis.