CVE-2026-68749 (GCVE-0-2026-68749)

Vulnerability from cvelistv5 – Published: 2026-08-06 14:50 – Updated: 2026-08-06 15:44
VLAI
Title
Quadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion denial of service
Summary
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.
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
EEF
References
Impacted products
Vendor Product Version
rrrene html_sanitize_ex Affected: 0.3.1 , < 1.5.3 (semver)
    cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*
 Create a notification for this product.
rrrene html_sanitize_ex Affected: 21f90012eb21aa36f4e3701b7547e12faf0f3c8b , < 4f4bd9eb254881462c0461fbab74b29188c2c133 (git)
    cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*
 Create a notification for this product.
Credits
Peter Ullrich Jonatan Männchen / EEF René Föhring
Show details on NVD website
To clipboard 

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An 80 KB `\u003cstyle\u003e` body costs roughly 2.4 seconds of scheduler time, so a few concurrent requests saturate the BEAM scheduler pool and make the application unresponsive.\\n\\nThe impact is CPU exhaustion only. Nothing is read, modified or disclosed.\\n\\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.\"}], \"value\": \"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 \u003cstyle\u003e body costs roughly 2.4 seconds of scheduler time, so a few concurrent requests saturate the BEAM scheduler pool and make the application unresponsive.\\n\\nThe impact is CPU exhaustion only. Nothing is read, modified or disclosed.\\n\\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.\"}], \"impacts\": [{\"capecId\": \"CAPEC-492\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-492 Regular Expression Exponential Blowup\"}]}], \"metrics\": [{\"cvssV4_0\": {\"Automatable\": \"NOT_DEFINED\", \"Recovery\": \"NOT_DEFINED\", \"Safety\": \"NOT_DEFINED\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"attackVector\": \"NETWORK\", \"baseScore\": 8.2, \"baseSeverity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"providerUrgency\": \"NOT_DEFINED\", \"subAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"version\": \"4.0\", \"vulnAvailabilityImpact\": \"HIGH\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"format\": \"CVSS\", \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-1333\", \"description\": \"CWE-1333 Inefficient Regular Expression Complexity\", \"lang\": \"en\", \"type\": \"CWE\"}]}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-06T14:50:12.593Z\"}, \"references\": [{\"tags\": [\"vendor-advisory\", \"related\"], \"url\": \"https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-4cx2-987x-rr2x\"}, {\"tags\": [\"related\"], \"url\": \"https://cna.erlef.org/cves/CVE-2026-68749.html\"}, {\"tags\": [\"related\"], \"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-68749\"}, {\"tags\": [\"patch\"], \"url\": \"https://github.com/rrrene/html_sanitize_ex/commit/4f4bd9eb254881462c0461fbab74b29188c2c133\"}], \"source\": {\"discovery\": \"EXTERNAL\"}, \"title\": \"Quadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion denial of service\", \"workarounds\": [{\"lang\": \"en\", \"supportingMedia\": [{\"base64\": false, \"type\": \"text/html\", \"value\": \"\u003cp\u003eSanitize with \u003ccode\u003ebasic_html/1\u003c/code\u003e, \u003ccode\u003emarkdown_html/1\u003c/code\u003e or \u003ccode\u003estrip_tags/1\u003c/code\u003e, none of which reach the CSS scrubber, or define a custom scrubber that allows neither \u003ccode\u003e\u0026lt;style\u0026gt;\u003c/code\u003e elements nor \u003ccode\u003estyle\u003c/code\u003e attributes.\u003c/p\u003e\\n\u003cp\u003eCapping the size of user-supplied HTML before it reaches the sanitizer bounds the cost, though the quadratic growth means the cap has to be small to be effective.\u003c/p\u003e\"}, {\"base64\": false, \"type\": \"text/markdown\", \"value\": \"Sanitize with `basic_html/1`, `markdown_html/1` or `strip_tags/1`, none of which reach the CSS scrubber, or define a custom scrubber that allows neither `\u003cstyle\u003e` elements nor `style` attributes.\\n\\nCapping the size of user-supplied HTML before it reaches the sanitizer bounds the cost, though the quadratic growth means the cap has to be small to be effective.\"}], \"value\": \"Sanitize with basic_html/1, markdown_html/1 or strip_tags/1, none of which reach the CSS scrubber, or define a custom scrubber that allows neither \u003cstyle\u003e elements nor style attributes.\\n\\nCapping the size of user-supplied HTML before it reaches the sanitizer bounds the cost, though the quadratic growth means the cap has to be small to be effective.\"}]}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-68749\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-06T15:44:14.739175Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-06T15:44:18.372Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68749\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"EEF\", \"dateReserved\": \"2026-07-31T13:23:00.355Z\", \"datePublished\": \"2026-08-06T14:50:12.593Z\", \"dateUpdated\": \"2026-08-06T15:44:22.358Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.