FKIE_CVE-2026-106454

Vulnerability from fkie_nvd - Published: 2026-10-06 20:17 - Updated: 2026-10-07 17:16
Severity
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Summary
Twisted is an event-based framework for internet applications, supporting Python 3.6+. In 25.5.0 and earlier, wildcardToRegexp() in twisted/mail/imap4.py translates the IMAP asterisk and percent wildcards but passes all other characters from an authenticated client's LIST or LSUB pattern directly to re.compile(), allowing nested or otherwise expensive regular expression constructs to cause catastrophic backtracking when matched against mailbox names. Because Twisted uses a cooperative single-threaded reactor, the blocking match suspends all server input and output for the duration of the match. No fixed release is available as of this review.
References
security-advisories@github.comhttps://github.com/twisted/twisted/commit/2f8a3c29246f4eb324690e06a9767a11dc4aec9f
security-advisories@github.comhttps://github.com/twisted/twisted/pull/12788
security-advisories@github.comhttps://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "twisted",
          "vendor": "twisted",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 25.5.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Twisted is an event-based framework for internet applications, supporting Python 3.6+. In 25.5.0 and earlier, wildcardToRegexp() in twisted/mail/imap4.py translates the IMAP asterisk and percent wildcards but passes all other characters from an authenticated client\u0027s LIST or LSUB pattern directly to re.compile(), allowing nested or otherwise expensive regular expression constructs to cause catastrophic backtracking when matched against mailbox names. Because Twisted uses a cooperative single-threaded reactor, the blocking match suspends all server input and output for the duration of the match. No fixed release is available as of this review."
    }
  ],
  "id": "CVE-2026-106454",
  "lastModified": "2026-10-07T17:16:48.133",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-106454",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-07T16:25:51.139114Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-06T20:17:27.597",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/twisted/twisted/commit/2f8a3c29246f4eb324690e06a9767a11dc4aec9f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/twisted/twisted/pull/12788"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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