CVE-2026-115775 (GCVE-0-2026-115775)
Vulnerability from cvelistv5
Published
2026-10-23 20:16
Modified
2026-10-23 20:16
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
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, the twisted.words.xish.domish ExpatElementStream parser allows an unauthenticated remote peer to keep a container element open while continuously adding child elements. The parser retains the unfinished stanza as an in-memory tree without a byte or element-count limit, and XMPP pre-authentication stream parsing exposes this behavior before credentials are accepted. A single connection can therefore exhaust server memory and terminate the process. This issue is fixed in version 26.10.0rc1.
References
Impacted products
Vendor Product Version
twisted twisted Version: < 26.10.0rc1
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "twisted",
          "vendor": "twisted",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 26.10.0rc1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, the twisted.words.xish.domish ExpatElementStream parser allows an unauthenticated remote peer to keep a container element open while continuously adding child elements. The parser retains the unfinished stanza as an in-memory tree without a byte or element-count limit, and XMPP pre-authentication stream parsing exposes this behavior before credentials are accepted. A single connection can therefore exhaust server memory and terminate the process. This issue is fixed in version 26.10.0rc1."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T20:16:29.913Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/twisted/twisted/security/advisories/GHSA-3476-c5c2-fr73",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/twisted/twisted/security/advisories/GHSA-3476-c5c2-fr73"
        },
        {
          "name": "https://github.com/twisted/twisted/pull/12751",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/twisted/twisted/pull/12751"
        },
        {
          "name": "https://github.com/twisted/twisted/commit/8873814bec8288e2466fad4d2c4d64039beb88b0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/twisted/twisted/commit/8873814bec8288e2466fad4d2c4d64039beb88b0"
        },
        {
          "name": "https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1"
        }
      ],
      "source": {
        "advisory": "GHSA-3476-c5c2-fr73",
        "discovery": "UNKNOWN"
      },
      "title": "Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish XML Element Stream via an Unbounded Element Tree"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-115775",
    "datePublished": "2026-10-23T20:16:29.913Z",
    "dateReserved": "2026-10-23T13:28:51.847Z",
    "dateUpdated": "2026-10-23T20:16:29.913Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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