id: PYSEC-2026-2472
published: "2026-07-13T14:20:03.334595Z"
modified: "2026-07-13T16:04:00.595867Z"
aliases:
- CVE-2023-29483
- GHSA-3rq5-2g8h-59hc
summary: Potential DoS via the Tudoor mechanism in eventlet and dnspython
details: "eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a \"TuDoor\" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1."
affected:
- package:
    name: eventlet
    ecosystem: PyPI
    purl: pkg:pypi/eventlet
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 0.35.2
  versions:
  - 0.10.0
  - 0.11.0
  - 0.12.1
  - 0.13.0
  - 0.14.0
  - 0.15.2
  - 0.16.1
  - 0.17.4
  - 0.18.2
  - 0.18.3
  - 0.18.4
  - 0.19.0
  - "0.2"
  - 0.20.0
  - 0.20.1
  - 0.21.0
  - 0.22.0
  - 0.22.1
  - 0.23.0
  - 0.24.0
  - 0.24.1
  - 0.25.0
  - 0.25.1
  - 0.25.2
  - 0.26.0
  - 0.26.1
  - 0.27.0
  - 0.28.0
  - 0.28.1
  - 0.29.0
  - 0.29.1
  - 0.30.0
  - 0.30.1
  - 0.30.2
  - 0.30.3
  - 0.31.0
  - 0.31.1
  - 0.32.0
  - 0.33.0
  - 0.33.1
  - 0.33.2
  - 0.33.3
  - 0.34.1
  - 0.34.2
  - 0.34.3
  - 0.35.0
  - 0.35.1
  - 0.5.3
  - 0.6.1
  - "0.7"
  - "0.8"
  - 0.8.16
  - 0.9.17
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2023-29483
- type: WEB
  url: https://github.com/eventlet/eventlet/issues/913
- type: WEB
  url: https://github.com/rthalley/dnspython/issues/1045
- type: WEB
  url: https://github.com/eventlet/eventlet/commit/51e3c4928d4938beb576eff34f3bf97e6e64e6b4
- type: WEB
  url: https://github.com/rthalley/dnspython/commit/0ea5ad0a4583e1f519b9bcc67cfac381230d9cf2
- type: PACKAGE
  url: https://github.com/eventlet/eventlet
- type: WEB
  url: https://github.com/eventlet/eventlet/releases/tag/v0.35.2
- type: WEB
  url: https://github.com/rthalley/dnspython/releases/tag/v2.6.0
- type: WEB
  url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NLRKR57IFVKQC2GCXZBFLCLBAWBWL3F6
- type: WEB
  url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VOHJOO3OM65UIUUUVDEXMCTXNM6LXZEH
- type: WEB
  url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3BNSIK5NFYSAP53Y45GOCMOQHHDLGIF
- type: WEB
  url: https://security.netapp.com/advisory/ntap-20240510-0001
- type: WEB
  url: https://security.snyk.io/vuln/SNYK-PYTHON-DNSPYTHON-6241713
- type: WEB
  url: https://www.dnspython.org
- type: PACKAGE
  url: https://pypi.org/project/eventlet
- type: ADVISORY
  url: https://github.com/advisories/GHSA-3rq5-2g8h-59hc
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H