insane is a whitelist-oriented HTML sanitizer. Versions 2.6.2 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no known patches are available.
CVE-2020-26303
HIGHNVD 7.57.5—Elevated
EchelonGraph scoreMEDIUM confidence
Score 7.5 from GitHub Security Advisory published 2024-10-26. NVD baseline CVSS 7.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EPSS
- 40.0%
- KEV
- Not listed
Published
October 26, 2024
Last Modified
November 13, 2024
References (2)
- security-advisories@githubhttps://github.com/bevacqua/insane/issues/19
- security-advisories@githubhttps://securitylab.github.com/advisories/GHSL-2020-289-redos-insane/
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Frequently asked(5)
What is CVE-2020-26303?
CVE-2020-26303 is a high vulnerability published on October 26, 2024. insane is a whitelist-oriented HTML sanitizer. Versions 2.6.2 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no known patches are available.
When was CVE-2020-26303 disclosed?
CVE-2020-26303 was first published in the National Vulnerability Database on October 26, 2024, with the most recent update on November 13, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-26303 actively exploited?
CVE-2020-26303 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-26303?
CVE-2020-26303 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2020-26303?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-26303, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2020-26303
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