Vulnerability-Lookup

CVE-2025-71407 (GCVE-0-2025-71407)

Vulnerability from cvelistv5 – Published: 2026-08-25 15:15 – Updated: 2026-08-25 16:10

Title

Nokogiri before 1.18.3 Stack Buffer Overflow and Use-After-Free

Summary

Nokogiri before 1.18.3 contains a stack buffer overflow vulnerability in libxml2 when reporting DTD validation errors with long QName prefixes, and a use-after-free vulnerability during validation against untrusted XML Schemas. Attackers can trigger these vulnerabilities by providing malicious DTD content or untrusted XSD files to cause denial of service or potential code execution.

Severity

9.3 (Critical)


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

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 16:10 UTC

CWE

CWE-787 - Out-of-bounds Write

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 , < 1.18.3 (semver) Unaffected: 1.18.3 (semver) cpe:2.3:a:nokogiri:nokogiri::::::::

Date Public

2025-02-18 00:00

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2025-71407

Vulnerability from fkie_nvd - Published: 2026-08-25 16:16 - Updated: 2026-08-28 18:56

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vvfq-8hwr-qm4m
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/nokogiri-before-stack-buffer-overflow-and-use-after-free

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "defaultStatus": "unaffected",
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    }
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  "id": "CVE-2025-71407",
  "lastModified": "2026-08-28T18:56:34.447",
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}

GHSA-HFQG-GQ7V-XWPG

Vulnerability from github – Published: 2026-08-25 18:31 – Updated: 2026-08-25 18:31

Details

Severity

9.8 (Critical)


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

9.3 (Critical)


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

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
    "CVE-2025-71407"
  ],
  "database_specific": {
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-25T16:16:45Z",
    "severity": "CRITICAL"
  },
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  "id": "GHSA-hfqg-gq7v-xwpg",
  "modified": "2026-08-25T18:31:50Z",
  "published": "2026-08-25T18:31:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vvfq-8hwr-qm4m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71407"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/nokogiri-before-stack-buffer-overflow-and-use-after-free"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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"
    }
  ]
}

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.

Action not permitted

CVE-2025-71407 (GCVE-0-2025-71407)

FKIE_CVE-2025-71407

GHSA-HFQG-GQ7V-XWPG

Tags

Sightings

Nomenclature