Vulnerability-Lookup

CVE-2026-79770 (GCVE-0-2026-79770)

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

Title

Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer

Summary

Nokogiri versions before 1.19.3 contain regular expression denial of service vulnerabilities in the CSS selector tokenizer affecting string-literal and identifier tokenization. Attackers can inject adversarial CSS selectors into methods like Node#css, Node#at_css, and Searchable#search to cause exponential regex backtracking and denial of service.

Severity

8.7 (High)


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

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 16:10 UTC

CWE

CWE-1333 - Inefficient Regular Expression Complexity

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

colby-swandale flavorjones

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-79770

Vulnerability from fkie_nvd - Published: 2026-08-25 16:17 - Updated: 2026-08-25 17:18

Severity

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

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-c4rq-3m3g-8wgx
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/nokogiri-before-redos-via-css-selector-tokenizer

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-5JHF-FPP7-V2PV

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

Details

Severity

7.5 (High)


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

8.7 (High)


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

Show details on source website

JSON

To clipboard

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    "github_reviewed_at": null,
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  },
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  "id": "GHSA-5jhf-fpp7-v2pv",
  "modified": "2026-08-25T18:31:52Z",
  "published": "2026-08-25T18:31:52Z",
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      "type": "WEB",
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    },
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      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-79770"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/nokogiri-before-redos-via-css-selector-tokenizer"
    }
  ],
  "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:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/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"
    }
  ]
}

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-2026-79770 (GCVE-0-2026-79770)

FKIE_CVE-2026-79770

GHSA-5JHF-FPP7-V2PV

Tags

Sightings

Nomenclature