Vulnerability-Lookup

CVE-2026-79771 (GCVE-0-2026-79771)

Vulnerability from cvelistv5 – Published: 2026-08-25 15:16 – Updated: 2026-08-25 17:44

Title

Nokogiri before 1.19.3 Memory Leak via XSLT Transform

Summary

Nokogiri versions before 1.19.3 contain a memory leak in the XSLT Stylesheet transform method when processing Ruby strings containing null bytes. Attackers can exploit this by passing attacker-controlled input with null bytes to transform parameters, causing heap allocations to leak and enabling denial of service against long-running processes.

Severity

6.9 (Medium)


                        
                          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

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 17:43 UTC

CWE

CWE-401 - Missing Release of Memory after Effective Lifetime

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/sparklemotion/nokogiri/securit…	vendor-advisory
https://www.vulncheck.com/advisories/nokogiri-bef…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
sparklemotion	nokogiri	Affected: 0 , < 1.19.3 (semver) Unaffected: 1.19.3 (semver) cpe:2.3:a:nokogiri:nokogiri::::::::

Date Public

2026-04-27 00:00

Credits

Captainjack-kor flavorjones

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-79771

Vulnerability from fkie_nvd - Published: 2026-08-25 16:17 - Updated: 2026-09-01 14:55

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-v2fc-qm4h-8hqv	Vendor Advisory
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/nokogiri-before-memory-leak-via-xslt-transform	Third Party Advisory

Impacted products

	Vendor	Product	Version
	nokogiri	nokogiri	*

JSON

To clipboard

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        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-RH9X-7XJC-VWX2

Vulnerability from github – Published: 2026-08-25 18:31 – Updated: 2026-09-02 14:42

Withdrawn 2026-09-02

Summary

Duplicate Advisory: Nokogiri XSLT transform has a memory leak

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-v2fc-qm4h-8hqv. This link is maintained to preserve external references.

Original Description

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 1.19.3"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "nokogiri"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-02T14:42:42Z",
    "nvd_published_at": "2026-08-25T16:17:28Z",
    "severity": "MODERATE"
  },
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-v2fc-qm4h-8hqv. This link is maintained to preserve external references.\n\n## Original Description\nNokogiri versions before 1.19.3 contain a memory leak in the XSLT Stylesheet transform method when processing Ruby strings containing null bytes. Attackers can exploit this by passing attacker-controlled input with null bytes to transform parameters, causing heap allocations to leak and enabling denial of service against long-running processes.",
  "id": "GHSA-rh9x-7xjc-vwx2",
  "modified": "2026-09-02T14:42:42Z",
  "published": "2026-08-25T18:31:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-v2fc-qm4h-8hqv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-79771"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/nokogiri-before-memory-leak-via-xslt-transform"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "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: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": "Duplicate Advisory: Nokogiri XSLT transform has a memory leak",
  "withdrawn": "2026-09-02T14:42:42Z"
}

GHSA-V2FC-QM4H-8HQV

Vulnerability from github – Published: 2026-05-06 18:27 – Updated: 2026-09-02 14:42

Summary

Nokogiri XSLT transform has a memory leak

Details

Summary

Nokogiri's Nokogiri::XSLT::Stylesheet#transform leaks a small heap allocation when passed a Ruby string parameter containing a null byte.

For applications that pass attacker-controlled input through XSLT.transform parameters, this may be a vector for a denial of service attack against long-running processes.

Mitigation

Upgrade to Nokogiri >= 1.19.3.

Users may also be able to mitigate this issue without upgrading by validating untrusted transform parameters before passing them to Nokogiri::XSLT::Stylesheet#transform.

Severity

The Nokogiri maintainers have evaluated this as Moderate Severity, CVSS 5.3.

Each leaked allocation is approximately 24–32 bytes, so meaningful memory growth requires sustained attacker-controlled traffic at high call rates. The bug does not cause memory corruption, information disclosure, or any change in the behavior of the transform itself, and the string-handling exception is raised as expected.

Applications that do not pass raw attacker-controlled bytes to XSLT parameters are unlikely to be affected in practice.

Resources

CWE-401: Missing Release of Memory after Effective Lifetime

Credit

This vulnerability was responsibly reported by @Captainjack-kor.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "nokogiri"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.19.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-79771"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-06T18:27:38Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nNokogiri\u0027s `Nokogiri::XSLT::Stylesheet#transform` leaks a small heap allocation when passed a Ruby string parameter containing a null byte.\n\nFor applications that pass attacker-controlled input through `XSLT.transform` parameters, this may be a vector for a denial of service attack against long-running processes.\n\n\n## Mitigation\n\nUpgrade to Nokogiri `\u003e= 1.19.3`.\n\nUsers may also be able to mitigate this issue without upgrading by validating untrusted transform parameters before passing them to `Nokogiri::XSLT::Stylesheet#transform`.\n\n\n## Severity\n\nThe Nokogiri maintainers have evaluated this as **Moderate Severity**, CVSS 5.3.\n\nEach leaked allocation is approximately 24\u201332 bytes, so meaningful memory growth requires sustained attacker-controlled traffic at high call rates. The bug does not cause memory corruption, information disclosure, or any change in the behavior of the transform itself, and the string-handling exception is raised as expected.\n\nApplications that do not pass raw attacker-controlled bytes to XSLT parameters are unlikely to be affected in practice.\n\n\n## Resources\n\n- [CWE-401: Missing Release of Memory after Effective Lifetime](https://cwe.mitre.org/data/definitions/401.html)\n\n\n## Credit\n\nThis vulnerability was responsibly reported by @Captainjack-kor.",
  "id": "GHSA-v2fc-qm4h-8hqv",
  "modified": "2026-09-02T14:42:59Z",
  "published": "2026-05-06T18:27:38Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-v2fc-qm4h-8hqv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-79771"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sparklemotion/nokogiri"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/nokogiri-before-memory-leak-via-xslt-transform"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Nokogiri XSLT transform has a memory leak"
}

ubuntu-cve-2026-79771

Vulnerability from osv_ubuntu

Published

2026-08-25 16:17

Modified

2026-09-02 16:27

Summary

Details

Severity

5.3 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

6.9 (Medium)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-79771	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-79771	REPORT
	https://github.com/sparklemotion/nokogiri/securit…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-nokogiri",
            "binary_version": "1.6.1+ds-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "ruby-nokogiri",
        "purl": "pkg:deb/ubuntu/ruby-nokogiri@1.6.1+ds-1ubuntu0.1~esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.9-2",
        "1.5.9-3",
        "1.6.0-1",
        "1.6.1+ds-1",
        "1.6.1+ds-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-nokogiri",
            "binary_version": "1.6.7.2-3ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "ruby-nokogiri",
        "purl": "pkg:deb/ubuntu/ruby-nokogiri@1.6.7.2-3ubuntu0.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.6.2+ds-2build2",
        "1.6.6.3-1",
        "1.6.7-1",
        "1.6.7.1-1",
        "1.6.7.2-3",
        "1.6.7.2-3build1",
        "1.6.7.2-3ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-nokogiri",
            "binary_version": "1.8.2-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "ruby-nokogiri",
        "purl": "pkg:deb/ubuntu/ruby-nokogiri@1.8.2-1ubuntu0.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.0-1",
        "1.8.1-1",
        "1.8.1-1build1",
        "1.8.2-1build1",
        "1.8.2-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-nokogiri",
            "binary_version": "1.10.7+dfsg1-2ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "ruby-nokogiri",
        "purl": "pkg:deb/ubuntu/ruby-nokogiri@1.10.7+dfsg1-2ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.3+dfsg1-2",
        "1.10.4+dfsg1-1",
        "1.10.7+dfsg1-1",
        "1.10.7+dfsg1-2",
        "1.10.7+dfsg1-2build1",
        "1.10.7+dfsg1-2ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-nokogiri",
            "binary_version": "1.13.1+dfsg-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "ruby-nokogiri",
        "purl": "pkg:deb/ubuntu/ruby-nokogiri@1.13.1+dfsg-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.11.1+dfsg-2ubuntu1",
        "1.11.7+dfsg-3",
        "1.11.7+dfsg-3build1",
        "1.13.1+dfsg-2",
        "1.13.1+dfsg-2ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-nokogiri",
            "binary_version": "1.16.2+dfsg-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "ruby-nokogiri",
        "purl": "pkg:deb/ubuntu/ruby-nokogiri@1.16.2+dfsg-1build1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14.3+dfsg-2",
        "1.16.2+dfsg-1",
        "1.16.2+dfsg-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-nokogiri",
            "binary_version": "1.18.10+dfsg-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "ruby-nokogiri",
        "purl": "pkg:deb/ubuntu/ruby-nokogiri@1.18.10+dfsg-3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.18.2+dfsg-1build1",
        "1.18.10+dfsg-2",
        "1.18.10+dfsg-3"
      ]
    }
  ],
  "aliases": [],
  "details": "Nokogiri versions before 1.19.3 contain a memory leak in the XSLT Stylesheet transform method when processing Ruby strings containing null bytes. Attackers can exploit this by passing attacker-controlled input with null bytes to transform parameters, causing heap allocations to leak and enabling denial of service against long-running processes.",
  "id": "UBUNTU-CVE-2026-79771",
  "modified": "2026-09-02T16:27:48Z",
  "published": "2026-08-25T16:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-79771"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-79771"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-v2fc-qm4h-8hqv"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-79771"
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-79771 (GCVE-0-2026-79771)

FKIE_CVE-2026-79771

GHSA-RH9X-7XJC-VWX2

Duplicate Advisory

Original Description

GHSA-V2FC-QM4H-8HQV

Summary

Mitigation

Severity

Resources

Credit

ubuntu-cve-2026-79771

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour