Answer in brief
CVE-2026-68750 records a High severity (CVSS 8.2) vulnerability in Quadratic sibling re-flattening in the html_sanitize_ex traversal engine 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), rrrene/html_sanitize_ex (generic), rrrene/html_sanitize_ex (generic) and additional mapped packages. 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), rrrene/html_sanitize_ex (generic), rrrene/html_sanitize_ex (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:rrrene:htmlsanitizeex:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| rrrene/html_sanitize_exgeneric | >=0.3.1 <1.5.3 | 1.5.3 |
| rrrene/html_sanitize_exgeneric | >=69ea11d61525c470b39b6860d024770d5573ff1f <9f5ccedbed230930813f992a1e6906fcf485981e | 9f5ccedbed230930813f992a1e6906fcf485981e |
| rrrene/html_sanitize_exgeneric | >=69ea11d61525c470b39b6860d024770d5573ff1f <* | * |
| rrrene/html_sanitize_exgeneric | >=0.3.1 <1.4.5 || >=1.5.0-rc.0 <1.5.3 | 1.4.5, 1.5.3 |
| rrrene/rrrene/html_sanitize_exgeneric | >=69ea11d61525c470b39b6860d024770d5573ff1f <* | * |
Published upstream
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 6, 2026
Inefficient Algorithmic Complexity vulnerability in the traversal engine in rrrene html_sanitize_ex allows an unauthenticated remote attacker to exhaust server CPU and memory via a flat run of sibling elements in sanitized HTML. The list clause of HtmlSanitizeEx.Traverser.traverse/2 recurses on the tail of a sibling list and then evaluates List.flatten([head] ++ tail) over the already flattened result, so every one of n siblings copies and re-walks the entire remaining tail. The flattening is only needed for the rare case where scrub returns several replacement nodes for one node, but the cost is paid across the whole tail at every step, making traversal quadratic in sibling count. The traverser sits on every public entry point, so no particular scrubber or configuration is required and the payload needs only allowed tags. A 160 KB body of 20,000 sibling elements occupies a scheduler for roughly 1.7 seconds, and the cost grows faster than the body does. 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.
Quoted source text, attributed separately from HOL analysis.