Vulnerability-Lookup

OESA-2026-1967 (CVE-2026-35611)

Vulnerability from osv_openeuler – Published: 2026-04-17 11:10 – Updated: 2026-08-06 11:10 – Source website

Summary

rubygem-addressable security update

Details

Addressable is a replacement for the URI implementation that is part of Ruby's standard library. It more closely conforms to the relevant RFCs and adds support for URI and URL templates.

Security Fix(es):

Within the URI template implementation in Addressable, two classes of URI template generate regular expressions vulnerable to catastrophic backtracking:

Templates using the * (explode) modifier with any expansion operator (e.g., {foo*}, {+var*}, {#var*}, {/var*}, {.var*}, {;var*}, {?var*}, {&var*}) generate patterns with nested unbounded quantifiers that are O(2^n) when matched against a maliciously crafted URI.
Templates using multiple variables with the + or # operators (e.g., {+v1,v2,v3}) generate patterns with O(n^k) complexity due to the comma separator being within the matched character class, causing ambiguous backtracking across k variables.

When matched against a maliciously crafted URI, this can result in catastrophic backtracking and uncontrolled resource consumption, leading to denial of service. The first pattern was partially addressed in 2.8.10 for certain operator combinations. Both patterns are fully remediated in 2.9.0.

Users of the URI parsing capabilities in Addressable but not the URI template matching capabilities are unaffected.(CVE-2026-35611)

Severity

7.5 (High)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-35611	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "noarch": [
          "rubygem-addressable-2.8.6-2.oe2403sp1.noarch.rpm",
          "rubygem-addressable-doc-2.8.6-2.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "rubygem-addressable-2.8.6-2.oe2403sp1.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "rubygem-addressable",
        "purl": "pkg:rpm/openEuler/rubygem-addressable\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.8.6-2.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "noarch": [
          "rubygem-addressable-2.8.6-2.oe2403sp2.noarch.rpm",
          "rubygem-addressable-doc-2.8.6-2.oe2403sp2.noarch.rpm"
        ],
        "src": [
          "rubygem-addressable-2.8.6-2.oe2403sp2.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP2",
        "name": "rubygem-addressable",
        "purl": "pkg:rpm/openEuler/rubygem-addressable\u0026distro=openEuler-24.03-LTS-SP2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.8.6-2.oe2403sp2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "noarch": [
          "rubygem-addressable-2.8.6-2.oe2403sp3.noarch.rpm",
          "rubygem-addressable-doc-2.8.6-2.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "rubygem-addressable-2.8.6-2.oe2403sp3.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "rubygem-addressable",
        "purl": "pkg:rpm/openEuler/rubygem-addressable\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.8.6-2.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "noarch": [
          "rubygem-addressable-2.5.2-3.oe2003sp4.noarch.rpm",
          "rubygem-addressable-doc-2.5.2-3.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "rubygem-addressable-2.5.2-3.oe2003sp4.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "rubygem-addressable",
        "purl": "pkg:rpm/openEuler/rubygem-addressable\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.2-3.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "noarch": [
          "rubygem-addressable-2.8.0-2.oe2203sp4.noarch.rpm",
          "rubygem-addressable-doc-2.8.0-2.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "rubygem-addressable-2.8.0-2.oe2203sp4.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "rubygem-addressable",
        "purl": "pkg:rpm/openEuler/rubygem-addressable\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.8.0-2.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "noarch": [
          "rubygem-addressable-2.8.6-2.oe2403sp1.noarch.rpm",
          "rubygem-addressable-doc-2.8.6-2.oe2403sp1.noarch.rpm",
          "rubygem-addressable-2.8.6-2.oe2403sp2.noarch.rpm",
          "rubygem-addressable-doc-2.8.6-2.oe2403sp2.noarch.rpm",
          "rubygem-addressable-2.8.6-2.oe2403sp3.noarch.rpm",
          "rubygem-addressable-doc-2.8.6-2.oe2403sp3.noarch.rpm",
          "rubygem-addressable-2.8.6-2.oe2403.noarch.rpm",
          "rubygem-addressable-doc-2.8.6-2.oe2403.noarch.rpm"
        ],
        "src": [
          "rubygem-addressable-2.8.6-2.oe2403sp1.src.rpm",
          "rubygem-addressable-2.8.6-2.oe2403sp2.src.rpm",
          "rubygem-addressable-2.8.6-2.oe2403sp3.src.rpm",
          "rubygem-addressable-2.8.6-2.oe2403.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS",
        "name": "rubygem-addressable",
        "purl": "pkg:rpm/openEuler/rubygem-addressable\u0026distro=openEuler-24.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.8.6-2.oe2403"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Addressable is a replacement for the URI implementation that is part of Ruby\u0026amp;apos;s standard library. It more closely conforms to the relevant RFCs and adds support for URI and URL templates.\r\n\r\nSecurity Fix(es):\n\nWithin the URI template implementation in Addressable, two classes of URI template generate regular expressions vulnerable to catastrophic backtracking:\r\n\r\n1. Templates using the `*` (explode) modifier with any expansion operator (e.g., `{foo*}`, `{+var*}`, `{#var*}`, `{/var*}`, `{.var*}`, `{;var*}`, `{?var*}`, `{\u0026amp;var*}`) generate patterns with nested unbounded quantifiers that are O(2^n) when matched against a maliciously crafted URI.\r\n2. Templates using multiple variables with the `+` or `#` operators (e.g., `{+v1,v2,v3}`) generate patterns with O(n^k) complexity due to the comma separator being within the matched character class, causing ambiguous backtracking across k variables.\r\n\r\nWhen matched against a maliciously crafted URI, this can result in catastrophic backtracking and uncontrolled resource consumption, leading to denial of service. The first pattern was partially addressed in 2.8.10 for certain operator combinations. Both patterns are fully remediated in 2.9.0.\r\n\r\nUsers of the URI parsing capabilities in Addressable but not the URI template matching capabilities are unaffected.(CVE-2026-35611)",
  "id": "OESA-2026-1967",
  "modified": "2026-08-06T11:10:58Z",
  "published": "2026-04-17T11:10:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1967"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35611"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rubygem-addressable security update",
  "upstream": [
    "CVE-2026-35611"
  ]
}

CVE-2026-35611 (GCVE-0-2026-35611)

Vulnerability from cvelistv5 – Published: 2026-04-07 16:38 – Updated: 2026-04-09 14:36

Title

Addressable has a Regular Expression Denial of Service in Addressable templates

Summary

Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. From 2.3.0 to before 2.9.0, within the URI template implementation in Addressable, two classes of URI template generate regular expressions vulnerable to catastrophic backtracking. Templates using the * (explode) modifier with any expansion operator (e.g., {foo*}, {+var*}, {#var*}, {/var*}, {.var*}, {;var*}, {?var*}, {&var*}) generate patterns with nested unbounded quantifiers that are O(2^n) when matched against a maliciously crafted URI. Templates using multiple variables with the + or # operators (e.g., {+v1,v2,v3}) generate patterns with O(n^k) complexity due to the comma separator being within the matched character class, causing ambiguous backtracking across k variables. When matched against a maliciously crafted URI, this can result in catastrophic backtracking and uncontrolled resource consumption, leading to denial of service. This vulnerability is fixed in 2.9.0.

Severity

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 2026-04-09 14:36 UTC

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/sporkmonger/addressable/securi…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
sporkmonger	addressable	Affected: >= 2.3.0, < 2.9.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-35611",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-09T14:36:09.398733Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-09T14:36:18.529Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "addressable",
          "vendor": "sporkmonger",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.3.0, \u003c 2.9.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Addressable is an alternative implementation to the URI implementation that is part of Ruby\u0027s standard library. From 2.3.0 to before 2.9.0, within the URI template implementation in Addressable, two classes of URI template generate regular expressions vulnerable to catastrophic backtracking. Templates using the * (explode) modifier with any expansion operator (e.g., {foo*}, {+var*}, {#var*}, {/var*}, {.var*}, {;var*}, {?var*}, {\u0026var*}) generate patterns with nested unbounded quantifiers that are O(2^n) when matched against a maliciously crafted URI. Templates using multiple variables with the + or # operators (e.g., {+v1,v2,v3}) generate patterns with O(n^k) complexity due to the comma separator being within the matched character class, causing ambiguous backtracking across k variables. When matched against a maliciously crafted URI, this can result in catastrophic backtracking and uncontrolled resource consumption, leading to denial of service. This vulnerability is fixed in 2.9.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1333",
              "description": "CWE-1333: Inefficient Regular Expression Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-07T16:38:08.707Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sporkmonger/addressable/security/advisories/GHSA-h27x-rffw-24p4",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sporkmonger/addressable/security/advisories/GHSA-h27x-rffw-24p4"
        }
      ],
      "source": {
        "advisory": "GHSA-h27x-rffw-24p4",
        "discovery": "UNKNOWN"
      },
      "title": "Addressable has a Regular Expression Denial of Service in Addressable templates"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-35611",
    "datePublished": "2026-04-07T16:38:08.707Z",
    "dateReserved": "2026-04-03T21:25:12.163Z",
    "dateUpdated": "2026-04-09T14:36:18.529Z",
    "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.

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.
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