{"id":"CVE-2026-24001","aliases":["GHSA-73rr-hh4g-fpgx"],"url":"https://o3.security/vulnerability/CVE-2026-24001","summary":"jsdiff has a Denial of Service vulnerability in parsePatch and applyPatch","details":"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`.","published":"2026-01-22T02:23:44.059Z","modified":"2026-07-16T03:30:55.249656689Z","cvss":null,"epss":{"score":0.00562,"percentile":0.43612,"asOf":"2026-08-06"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"diff","fixedVersion":"8.0.3"},{"ecosystem":"npm","name":"diff","fixedVersion":"5.2.2"},{"ecosystem":"npm","name":"diff","fixedVersion":"4.0.4"},{"ecosystem":"npm","name":"diff","fixedVersion":"3.5.1"}],"fix":{"url":"https://github.com/kpdecker/jsdiff/commit/15a1585230748c8ae6f8274c202e0c87309142f5","label":"kpdecker/jsdiff@15a1585"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24001.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-24001"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/24xxx/CVE-2026-24001.json"},{"type":"ADVISORY","url":"https://github.com/kpdecker/jsdiff/security/advisories/GHSA-73rr-hh4g-fpgx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24001"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2431930"},{"type":"REPORT","url":"https://github.com/kpdecker/jsdiff/issues/653"},{"type":"FIX","url":"https://github.com/kpdecker/jsdiff/commit/15a1585230748c8ae6f8274c202e0c87309142f5"},{"type":"FIX","url":"https://github.com/kpdecker/jsdiff/pull/649"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-16T03:30:55.249656689Z"}}