kpdecker jsdiff up to 4.0.3/5.2.1/8.0.2 Patch parsePatch resource consumption

Summaryinfo

A vulnerability categorized as problematic has been discovered in kpdecker jsdiff up to 4.0.3/5.2.1/8.0.2. This issue affects the function parsePatch of the component Patch Handler. Executing a manipulation can lead to resource consumption. This vulnerability is registered as CVE-2026-24001. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in kpdecker jsdiff up to 4.0.3/5.2.1/8.0.2. This vulnerability affects the function parsePatch of the component Patch Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. CVE summarizes:

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`.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-24001 since 01/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 296224 (Linux Distros Unpatched Vulnerability : CVE-2026-24001), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.0.4, 5.2.2 or 8.0.3 eliminates this vulnerability. Applying the patch 15a1585230748c8ae6f8274c202e0c87309142f5 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (296224) and CERT Bund (WID-SEC-2026-0526). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• IBM App Connect Enterprise

Productinfo

Vendor

• kpdecker

Name

• jsdiff

Version

• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 5.2.0
• 5.2.1
• 8.0.0
• 8.0.1
• 8.0.2

License

• open-source

Website

• Product: https://github.com/kpdecker/jsdiff/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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