Potential DoS via the Tudoor mechanism in eventlet and dnspython
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | dnspython | < 2.6.1 | 2.6.1 |
| Python (PyPI) | eventlet | < 0.35.2 | 0.35.2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-29483
- https://github.com/eventlet/eventlet/issues/913
- https://github.com/rthalley/dnspython/issues/1045
- https://github.com/eventlet/eventlet/commit/51e3c4928d4938beb576eff34f3bf97e6e64e6b4
- https://github.com/rthalley/dnspython/commit/0ea5ad0a4583e1f519b9bcc67cfac381230d9cf2
- https://github.com/eventlet/eventlet
- https://github.com/eventlet/eventlet/releases/tag/v0.35.2
- https://github.com/rthalley/dnspython/releases/tag/v2.6.0
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NLRKR57IFVKQC2GCXZBFLCLBAWBWL3F6
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VOHJOO3OM65UIUUUVDEXMCTXNM6LXZEH
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3BNSIK5NFYSAP53Y45GOCMOQHHDLGIF
- https://security.netapp.com/advisory/ntap-20240510-0001
- https://security.snyk.io/vuln/SNYK-PYTHON-DNSPYTHON-6241713
- https://www.dnspython.org
- https://pypi.org/project/dnspython
- https://github.com/advisories/GHSA-3rq5-2g8h-59hc
- https://pypi.org/project/eventlet
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-696- Platform
- Python (PyPI)
- Package
dnspython, eventlet- Disclosed
- 11.04.2024
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1307 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-2472 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-3rq5-2g8h-59hc - CC BY 4.0
Vulnerability history: eventlet
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 05.2021 08.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 3
Disclosures per year
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 1
- 2025: 1
- 2026: 0
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Potential DoS via the Tudoor mechanism in eventlet and dnspython this entry
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