CVE-2026-24001 (GCVE-0-2026-24001)

Vulnerability from cvelistv5 – Published: 2026-01-22 02:23 – Updated: 2026-01-22 02:23
VLAI?
Title
jsdiff has a Denial of Service vulnerability in parsePatch and applyPatch
Summary
jsdiff is a JavaScript text differencing implementation. Prior to versions 8.0.3, 5.2.2, and 4.0.4, 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, and 4.0.4 contain a fix. As a workaround, do not attempt to parse patches that contain any of these characters: `\r`, `\u2028`, or `\u2029`.
Severity ?
2.7 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
Vendor Product Version
kpdecker jsdiff Affected: >= 6.0.0, < 8.0.3
Affected: >= 5.0.0, < 5.2.2
Affected: < 4.0.4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "jsdiff",
          "vendor": "kpdecker",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 6.0.0, \u003c 8.0.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 5.2.2"
            },
            {
              "status": "affected",
              "version": "\u003c 4.0.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "jsdiff is a JavaScript text differencing implementation. Prior to versions 8.0.3, 5.2.2, and 4.0.4, 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\u0027s *patch* header (also known as its \"leading garbage\"). A maliciously-crafted patch header of length *n* can take `parsePatch` O(*n*\u00b3) time to parse. Versions 8.0.3, 5.2.2, and 4.0.4 contain a fix. As a workaround, do not attempt to parse patches that contain any of these characters: `\\r`, `\\u2028`, or `\\u2029`."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 2.7,
            "baseSeverity": "LOW",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
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              "description": "CWE-400: Uncontrolled Resource Consumption",
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        },
        {
          "descriptions": [
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              "cweId": "CWE-1333",
              "description": "CWE-1333: Inefficient Regular Expression Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-22T02:23:44.059Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/kpdecker/jsdiff/security/advisories/GHSA-73rr-hh4g-fpgx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/kpdecker/jsdiff/security/advisories/GHSA-73rr-hh4g-fpgx"
        },
        {
          "name": "https://github.com/kpdecker/jsdiff/issues/653",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/kpdecker/jsdiff/issues/653"
        },
        {
          "name": "https://github.com/kpdecker/jsdiff/pull/649",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/kpdecker/jsdiff/pull/649"
        },
        {
          "name": "https://github.com/kpdecker/jsdiff/commit/15a1585230748c8ae6f8274c202e0c87309142f5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/kpdecker/jsdiff/commit/15a1585230748c8ae6f8274c202e0c87309142f5"
        }
      ],
      "source": {
        "advisory": "GHSA-73rr-hh4g-fpgx",
        "discovery": "UNKNOWN"
      },
      "title": "jsdiff has a Denial of Service vulnerability in parsePatch and applyPatch"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-24001",
    "datePublished": "2026-01-22T02:23:44.059Z",
    "dateReserved": "2026-01-19T18:49:20.658Z",
    "dateUpdated": "2026-01-22T02:23:44.059Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-24001\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-01-22T03:15:47.627\",\"lastModified\":\"2026-01-22T03:15:47.627\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"jsdiff is a JavaScript text differencing implementation. Prior to versions 8.0.3, 5.2.2, and 4.0.4, 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\u0027s *patch* header (also known as its \\\"leading garbage\\\"). A maliciously-crafted patch header of length *n* can take `parsePatch` O(*n*\u00b3) time to parse. Versions 8.0.3, 5.2.2, and 4.0.4 contain a fix. As a workaround, do not attempt to parse patches that contain any of these characters: `\\\\r`, `\\\\u2028`, or `\\\\u2029`.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":2.7,\"baseSeverity\":\"LOW\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"LOW\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"UNREPORTED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-400\"},{\"lang\":\"en\",\"value\":\"CWE-1333\"}]}],\"references\":[{\"url\":\"https://github.com/kpdecker/jsdiff/commit/15a1585230748c8ae6f8274c202e0c87309142f5\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/kpdecker/jsdiff/issues/653\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/kpdecker/jsdiff/pull/649\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/kpdecker/jsdiff/security/advisories/GHSA-73rr-hh4g-fpgx\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}


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