GHSA-cgfm-xwp7-2cvr CVE-2022-25887
Sanitize-html Vulnerable To REDoS Attacks
- Severity
- 7.5 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 1.55%
- Chance of exploitation in the next 30 days. Higher than 75.10% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-1333 Inefficient Regular Expression Complexity
- Fix
2.7.1- Upgrade sanitize-html to this version or later
Description
The package sanitize-html before 2.7.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to insecure global regular expression replacement logic of HTML comment removal.
Affected versions
npm
| Package | Vulnerable | Fixed in |
|---|---|---|
| sanitize-html | < 2.7.1 |
2.7.1 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
sanitize-html npm → 2.7.1
- npm
npm install sanitize-html@2.7.1- yarn
yarn add sanitize-html@2.7.1- pnpm
pnpm add sanitize-html@2.7.1
Severity breakdown
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-1333: Inefficient Regular Expression Complexity
The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.
How to prevent it
- Architecture and Design: Use regular expressions that do not support backtracking, e.g. by removing nested quantifiers.
- System Configuration: Set backtracking limits in the configuration of the regular expression implementation, such as PHP's pcre.backtrack_limit. Also consider limits on execution time for the process.
- Implementation: Do not use regular expressions with untrusted input. If regular expressions must be used, avoid using backtracking in the expression.
- Implementation: Limit the length of the input that the regular expression will process.
References
Advisories
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-cv27-6wvh-8x7j ApostropheCMS: Incomplete CVE-2026-53606: `meta http-equiv=refresh` `content` still ships `javascript:` / `data:` URLs | Medium | Also affects sanitize-html |
| GHSA-374f-7chj-9948 ApostropheCMS sanitize-html: SMIL animation namespace-prefix bypass allows javascript: URI injection (XSS) | Low | Also affects sanitize-html |
| GHSA-x3q4-9hxx-gx8m ApostropheCMS sanitize-html: nonTextTags discard region ends early on an implied close, letting <noscript> content render | Medium | Also affects sanitize-html |
| GHSA-c9rx-x947-fp3h ApostropheCMS sanitize-html: unbounded recursion when re-sanitizing the fallback of a discarded iframe (stack overflow, nestingLimit not enforced) | Medium | Also affects sanitize-html |
| GHSA-g8qq-57p8-ggw5 ApostropheCMS: Stored XSS via SVG SMIL URI-list scheme-policy bypass | Medium | Also affects sanitize-html |
| GHSA-jxwj-j7wr-gfrw ApostropheCMS: Mutation-XSS / allowedTags bypass via literal `</textarea/>` solidus close | Medium | Also affects sanitize-html |
| GHSA-vccv-cmxp-4j9h sanitize-html has incomplete URI scheme validation in that allows javascript: URIs through action, formaction, data, poster, and background attributes | Medium | Also affects sanitize-html |
| GHSA-rpr9-rxv7-x643 Apostrophe has default XSS via `xmp` raw-text passthrough in `sanitize-html` | Critical | Also affects sanitize-html |
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