CVE-2026-24001
Severity CVSS v4.0:
LOW
Type:
CWE-400
Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
22/01/2026
Last modified:
04/03/2026
Description
jsdiff is a JavaScript text differencing implementation. Prior to versions 8.0.3, 5.2.2, 4.0.4, and 3.5.1, attempting to parse a patch whose filename headers contain the line break characters `\r`, `\u2028`, or `\u2029` can cause the `parsePatch` method to enter an infinite loop. It then consumes memory without limit until the process crashes due to running out of memory. Applications are therefore likely to be vulnerable to a denial-of-service attack if they call `parsePatch` with a user-provided patch as input. A large payload is not needed to trigger the vulnerability, so size limits on user input do not provide any protection. Furthermore, some applications may be vulnerable even when calling `parsePatch` on a patch generated by the application itself if the user is nonetheless able to control the filename headers (e.g. by directly providing the filenames of the files to be diffed). The `applyPatch` method is similarly affected if (and only if) called with a string representation of a patch as an argument, since under the hood it parses that string using `parsePatch`. Other methods of the library are unaffected. Finally, a second and lesser interdependent bug - a ReDOS - also exhibits when those same line break characters are present in a patch's *patch* header (also known as its "leading garbage"). A maliciously-crafted patch header of length *n* can take `parsePatch` O(*n*³) time to parse. Versions 8.0.3, 5.2.2, 4.0.4, and 3.5.1 contain a fix. As a workaround, do not attempt to parse patches that contain any of these characters: `\r`, `\u2028`, or `\u2029`.
Impact
Base Score 4.0
2.70
Severity 4.0
LOW
Base Score 3.x
7.50
Severity 3.x
HIGH
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:kpdecker:jsdiff:*:*:*:*:*:node.js:*:* | 3.5.1 (excluding) | |
| cpe:2.3:a:kpdecker:jsdiff:*:*:*:*:*:node.js:*:* | 4.0.0 (including) | 4.0.4 (excluding) |
| cpe:2.3:a:kpdecker:jsdiff:*:*:*:*:*:node.js:*:* | 5.0.0 (including) | 5.2.2 (excluding) |
| cpe:2.3:a:kpdecker:jsdiff:*:*:*:*:*:node.js:*:* | 6.0.0 (including) | 8.0.3 (excluding) |
To consult the complete list of CPE names with products and versions, see this page