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    2 vulnerabilities found for multidict by aio-libs

    CVE-2026-104874 (GCVE-0-2026-104874)

    Vulnerability from nvd – Published: 2026-10-02 20:21 – Updated: 2026-10-02 20:21
    VLAI
    Title
    Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction
    Summary
    Multidict is an implementation of a multidict data structure. From 6.7.0 until 6.9.1, the C extension's items-view reflected union operation, operand | d.items(), in multidict_itemsview_or2_impl and subtraction operation, d.items() - operand, in multidict_itemsview_sub1_impl fail to release new key-identity and value references returned for each operand element. Applications that perform these operations over attacker-influenced sequences can leak two strong references per element, and garbage collection cannot reclaim them, so repeated operations can cause unbounded process memory growth and denial of service. Forward union, intersection, non-tuple operand elements, and pure-Python builds are not affected by this reference leak. This issue is fixed in version 6.9.1.
    Severity
    5.3 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
    CWE
    • CWE-401 - Missing Release of Memory after Effective Lifetime
    Assigner
    References
    Impacted products
    Vendor Product Version
    aio-libs multidict Affected: >= 6.7.0, < 6.9.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "multidict",
          "vendor": "aio-libs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 6.7.0, \u003c 6.9.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Multidict is an implementation of a multidict data structure. From 6.7.0 until 6.9.1, the C extension\u0027s items-view reflected union operation, operand | d.items(), in multidict_itemsview_or2_impl and subtraction operation, d.items() - operand, in multidict_itemsview_sub1_impl fail to release new key-identity and value references returned for each operand element. Applications that perform these operations over attacker-influenced sequences can leak two strong references per element, and garbage collection cannot reclaim them, so repeated operations can cause unbounded process memory growth and denial of service. Forward union, intersection, non-tuple operand elements, and pure-Python builds are not affected by this reference leak. This issue is fixed in version 6.9.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "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:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-401",
              "description": "CWE-401: Missing Release of Memory after Effective Lifetime",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-02T20:21:50.903Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/aio-libs/multidict/security/advisories/GHSA-54p9-h82j-f925",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/aio-libs/multidict/security/advisories/GHSA-54p9-h82j-f925"
        },
        {
          "name": "https://github.com/aio-libs/multidict/commit/350b4a07bf8ff851b6d7544e81b1c748bdc74c40",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/aio-libs/multidict/commit/350b4a07bf8ff851b6d7544e81b1c748bdc74c40"
        },
        {
          "name": "https://github.com/aio-libs/multidict/releases/tag/v6.9.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/aio-libs/multidict/releases/tag/v6.9.1"
        }
      ],
      "source": {
        "advisory": "GHSA-54p9-h82j-f925",
        "discovery": "UNKNOWN"
      },
      "title": "Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-104874",
    "datePublished": "2026-10-02T20:21:50.903Z",
    "dateReserved": "2026-10-02T14:59:11.775Z",
    "dateUpdated": "2026-10-02T20:21:50.903Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-104874 (GCVE-0-2026-104874)

    Vulnerability from cvelistv5 – Published: 2026-10-02 20:21 – Updated: 2026-10-02 20:21
    VLAI
    Title
    Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction
    Summary
    Multidict is an implementation of a multidict data structure. From 6.7.0 until 6.9.1, the C extension's items-view reflected union operation, operand | d.items(), in multidict_itemsview_or2_impl and subtraction operation, d.items() - operand, in multidict_itemsview_sub1_impl fail to release new key-identity and value references returned for each operand element. Applications that perform these operations over attacker-influenced sequences can leak two strong references per element, and garbage collection cannot reclaim them, so repeated operations can cause unbounded process memory growth and denial of service. Forward union, intersection, non-tuple operand elements, and pure-Python builds are not affected by this reference leak. This issue is fixed in version 6.9.1.
    Severity
    5.3 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
    CWE
    • CWE-401 - Missing Release of Memory after Effective Lifetime
    Assigner
    References
    Impacted products
    Vendor Product Version
    aio-libs multidict Affected: >= 6.7.0, < 6.9.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "multidict",
          "vendor": "aio-libs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 6.7.0, \u003c 6.9.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Multidict is an implementation of a multidict data structure. From 6.7.0 until 6.9.1, the C extension\u0027s items-view reflected union operation, operand | d.items(), in multidict_itemsview_or2_impl and subtraction operation, d.items() - operand, in multidict_itemsview_sub1_impl fail to release new key-identity and value references returned for each operand element. Applications that perform these operations over attacker-influenced sequences can leak two strong references per element, and garbage collection cannot reclaim them, so repeated operations can cause unbounded process memory growth and denial of service. Forward union, intersection, non-tuple operand elements, and pure-Python builds are not affected by this reference leak. This issue is fixed in version 6.9.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "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:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-401",
              "description": "CWE-401: Missing Release of Memory after Effective Lifetime",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-02T20:21:50.903Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/aio-libs/multidict/security/advisories/GHSA-54p9-h82j-f925",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/aio-libs/multidict/security/advisories/GHSA-54p9-h82j-f925"
        },
        {
          "name": "https://github.com/aio-libs/multidict/commit/350b4a07bf8ff851b6d7544e81b1c748bdc74c40",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/aio-libs/multidict/commit/350b4a07bf8ff851b6d7544e81b1c748bdc74c40"
        },
        {
          "name": "https://github.com/aio-libs/multidict/releases/tag/v6.9.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/aio-libs/multidict/releases/tag/v6.9.1"
        }
      ],
      "source": {
        "advisory": "GHSA-54p9-h82j-f925",
        "discovery": "UNKNOWN"
      },
      "title": "Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-104874",
    "datePublished": "2026-10-02T20:21:50.903Z",
    "dateReserved": "2026-10-02T14:59:11.775Z",
    "dateUpdated": "2026-10-02T20:21:50.903Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}