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CVE-2026-68750 rrrene CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-06T16:16:51.907Z and has not been modified since then. The NVD entry is currently Undergoing Analysis. The CVE-2026-68750 vulnerability is caused by an Inefficient Algorithmic Complexity in the traversal engine of rrrene html_sanitize_ex. This allows an unauthenticated remote attacker to exhaust server CPU and memory via a flat run of sibling elements in sanitized HTML. The vulnerability affects html_sanitize_ex versions from 0.3.1 before 1.5.3. 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. Users of html_sanitize_ex, especially those who handle user-supplied HTML input, should be aware of this vulnerability and take steps to mitigate it. This includes developers and administrators of applications using html_sanitize_ex, as well as security teams responsible for monitoring and protecting against potential exploits.

Vendor
rrrene
Product
html_sanitize_ex
CVSS
HIGH 8.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-06
Original CVE updated
2026-08-07
Advisory published
2026-08-06
Advisory updated
2026-08-07

Who should care

Users of html_sanitize_ex, especially those who handle user-supplied HTML input, should be aware of this vulnerability and take steps to mitigate it. This includes developers and administrators of applications using html_sanitize_ex, as well as security teams responsible for monitoring and protecting against potential exploits.

Technical summary

The CVE-2026-68750 vulnerability is caused by an Inefficient Algorithmic Complexity in the traversal engine of rrrene html_sanitize_ex. This allows an unauthenticated remote attacker to exhaust server CPU and memory via a flat run of sibling elements in sanitized HTML. The vulnerability affects html_sanitize_ex versions from 0.3.1 before 1.5.3. 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.

Defensive priority

High-priority defensive actions are required due to the HIGH CVSS severity score of 8.2 and the potential for unauthenticated remote attackers to exhaust server CPU and memory.

Recommended defensive actions

  • Inventory and assess html_sanitize_ex versions to identify potentially vulnerable instances
  • Apply patches or upgrades to html_sanitize_ex version 1.5.3 or later
  • Implement compensating controls such as rate limiting or monitoring for suspicious traffic
  • Review and update sanitization configurations to minimize exposure
  • Monitor system performance and logs for signs of potential exploitation

Evidence notes

The CVE-2026-68750 vulnerability is caused by an Inefficient Algorithmic Complexity in the traversal engine of rrrene html_sanitize_ex. This allows an unauthenticated remote attacker to exhaust server CPU and memory via a flat run of sibling elements in sanitized HTML. The vulnerability affects html_sanitize_ex versions from 0.3.1 before 1.5.3. Evidence is based on official CVE and NVD records, as well as references from Erlef, GitHub, and OSV.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-06T16:16:51.907Z and has not been modified since then.