CVE-2026-68749

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Source
https://cve.org/CVERecord?id=CVE-2026-68749
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68749.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-68749
Aliases
Published
2026-08-06T14:50:12.593Z
Modified
2026-08-08T03:47:58.848625227Z
Severity
  • 8.2 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Quadratic regex backtracking in the html_sanitize_ex CSS scrubber allows CPU-exhaustion denial of service
Details

Inefficient Regular Expression Complexity vulnerability in the CSS scrubber in rrrene htmlsanitizeex 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 htmlsanitizeex: from 0.3.1 before 1.5.3.

Database specific 
{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "21f90012eb21aa36f4e3701b7547e12faf0f3c8b"
                },
                {
                    "fixed": "4f4bd9eb254881462c0461fbab74b29188c2c133"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68749.json",
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-1333"
    ]
}
References

Affected packages

Git / github.com/rrrene/html_sanitize_ex

Affected ranges

Type
GIT
Repo
https://github.com/rrrene/html_sanitize_ex
Events
Introduced
088f92b18a4a3911a862b527d5eb3713f9abac24
Fixed
f25255c82a3c6034a57d934718e10c982d29fa31
Fixed
4f4bd9eb254881462c0461fbab74b29188c2c133
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0.3.1"
        },
        {
            "fixed": "1.5.3"
        }
    ],
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.3.1
v1.*
v1.0.0
v1.0.1
v1.2.0
v1.4.1
v1.4.2
v1.4.3
v1.4.4
v1.5.0
v1.5.0-rc.0
v1.5.1
v1.5.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68749.json"