---
id: CVE-2026-24001
title: jsdiff is a JavaScript text differencing implementation
summary: >-
  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 `pa…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
  - CWE-1333
  - CWE-400
vendor: kpdecker
product: jsdiff
affected:
  - jsdiff < 3.5.1
  - 'jsdiff >= 4.0.0, < 4.0.4'
  - 'jsdiff >= 5.0.0, < 5.2.2'
  - 'jsdiff >= 6.0.0, < 8.0.3'
patched:
  - jsdiff 8.0.3
published: '2026-01-22'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-24001'
references:
  - url: >-
      https://github.com/kpdecker/jsdiff/commit/15a1585230748c8ae6f8274c202e0c87309142f5
    label: security-advisories@github.com
  - url: 'https://github.com/kpdecker/jsdiff/issues/653'
    label: security-advisories@github.com
  - url: 'https://github.com/kpdecker/jsdiff/pull/649'
    label: security-advisories@github.com
  - url: 'https://github.com/kpdecker/jsdiff/security/advisories/GHSA-73rr-hh4g-fpgx'
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-24001'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2431930'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24001.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00625
epssPercentile: 0.47764
ingestedAt: '2026-06-30T13:26:50.538Z'
---

## Overview

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`.

## Affected

- `jsdiff < 3.5.1`
- `jsdiff >= 4.0.0, < 4.0.4`
- `jsdiff >= 5.0.0, < 5.2.2`
- `jsdiff >= 6.0.0, < 8.0.3`

## Remediation

Upgrade past the affected range:

- `jsdiff 8.0.3`