Vulnerability-Lookup

OESA-2026-1579 (CVE-2026-27601)

Vulnerability from osv_openeuler – Published: 2026-03-15 11:10 – Updated: 2026-08-06 11:10 – Source website

Summary

nodejs-underscore security update

Details

Underscore.js is a utility-belt library for JavaScript that provides support for the usual functional suspects (each, map, reduce, filter...) without extending any core JavaScript objects.

Security Fix(es):

Underscore.js is a utility-belt library for JavaScript. Prior to version 1.13.8, the _.flatten and _.isEqual functions use recursion without a depth limit. Under very specific conditions, an attacker could exploit this to cause a Denial of Service (DoS) attack by triggering a stack overflow. Exploitation requires all of the following: untrusted input must be used to create a deeply recursive data structure (e.g., via JSON.parse with no enforced depth limit), and this structure must be passed to _.flatten or _.isEqual. For _.flatten, the attacker must be able to prepare a data structure consisting solely of arrays at all levels, and no finite depth limit must be passed as the second argument to _.flatten. For _.isEqual, there must exist a code path where two distinct but structurally equivalent data structures, submitted by the same remote client, are compared using _.isEqual. Additionally, exceptions resulting from the stack overflow must not be caught. This vulnerability is fixed in version 1.13.8.(CVE-2026-27601)

Severity

8.2 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-27601	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "noarch": [
          "js-underscore-1.13.8-1.oe2403sp3.noarch.rpm",
          "nodejs-underscore-1.13.8-1.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "nodejs-underscore-1.13.8-1.oe2403sp3.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "nodejs-underscore",
        "purl": "pkg:rpm/openEuler/nodejs-underscore\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.13.8-1.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Underscore.js is a utility-belt library for JavaScript that provides support for the usual functional suspects (each, map, reduce, filter...) without extending any core JavaScript objects.\r\n\r\nSecurity Fix(es):\n\nUnderscore.js is a utility-belt library for JavaScript. Prior to version 1.13.8, the `_.flatten` and `_.isEqual` functions use recursion without a depth limit. Under very specific conditions, an attacker could exploit this to cause a Denial of Service (DoS) attack by triggering a stack overflow. Exploitation requires all of the following: untrusted input must be used to create a deeply recursive data structure (e.g., via `JSON.parse` with no enforced depth limit), and this structure must be passed to `_.flatten` or `_.isEqual`. For `_.flatten`, the attacker must be able to prepare a data structure consisting solely of arrays at all levels, and no finite depth limit must be passed as the second argument to `_.flatten`. For `_.isEqual`, there must exist a code path where two distinct but structurally equivalent data structures, submitted by the same remote client, are compared using `_.isEqual`. Additionally, exceptions resulting from the stack overflow must not be caught. This vulnerability is fixed in version 1.13.8.(CVE-2026-27601)",
  "id": "OESA-2026-1579",
  "modified": "2026-08-06T11:10:35Z",
  "published": "2026-03-15T11:10:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1579"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27601"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "nodejs-underscore security update",
  "upstream": [
    "CVE-2026-27601"
  ]
}

CVE-2026-27601 (GCVE-0-2026-27601)

Vulnerability from cvelistv5 – Published: 2026-03-03 22:38 – Updated: 2026-03-04 16:44

Title

Underscore.js has unlimited recursion in _.flatten and _.isEqual, potential for DoS attack

Summary

Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten, the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path in which two distinct datastructures that were submitted by the same remote client are compared using _.isEqual. For example, if a client submits data that are stored in a database, and the same client can later submit another datastructure that is then compared to the data that were saved in the database previously, OR if a client submits a single request, but its data are parsed twice, creating two non-identical but equivalent datastructures that are then compared. Exceptions originating from the call to _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed in 1.13.8.

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-04 16:44 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/jashkenas/underscore/security/…	x_refsource_CONFIRM
https://github.com/jashkenas/underscore/commit/41…	x_refsource_MISC
https://github.com/jashkenas/underscore/commit/a6…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
jashkenas	underscore	Affected: < 1.13.8

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-27601",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-04T16:44:25.481747Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-04T16:44:40.856Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "underscore",
          "vendor": "jashkenas",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.13.8"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten, the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path in which two distinct datastructures that were submitted by the same remote client are compared using _.isEqual. For example, if a client submits data that are stored in a database, and the same client can later submit another datastructure that is then compared to the data that were saved in the database previously, OR if a client submits a single request, but its data are parsed twice, creating two non-identical but equivalent datastructures that are then compared. Exceptions originating from the call to _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed in 1.13.8."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-03T22:38:38.955Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
      "references": [
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          "name": "https://github.com/jashkenas/underscore/security/advisories/GHSA-qpx9-hpmf-5gmw",
          "tags": [
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          ],
          "url": "https://github.com/jashkenas/underscore/security/advisories/GHSA-qpx9-hpmf-5gmw"
        },
        {
          "name": "https://github.com/jashkenas/underscore/commit/411e222eb0ca5d570cc4f6315c02c05b830ed2b4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jashkenas/underscore/commit/411e222eb0ca5d570cc4f6315c02c05b830ed2b4"
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          "url": "https://github.com/jashkenas/underscore/commit/a6e23ae9647461ec33ad9f92a2ecfc220eea0a84"
        }
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      "source": {
        "advisory": "GHSA-qpx9-hpmf-5gmw",
        "discovery": "UNKNOWN"
      },
      "title": "Underscore.js has unlimited recursion in _.flatten and _.isEqual, potential for DoS attack"
    }
  },
  "cveMetadata": {
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    "datePublished": "2026-03-03T22:38:38.955Z",
    "dateReserved": "2026-02-20T19:43:14.602Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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OESA-2026-1579 (CVE-2026-27601)

CVE-2026-27601 (GCVE-0-2026-27601)

Tags

Sightings

Nomenclature

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