CVE-2026-83813: twisted · Origin Validation Error
Affects twistedSource CVE Database V5
Not known to be exploited · CVSS 3.1 Low : upgrade to 26.7.0rc1 when convenient.
Data as of 26 Oct 2026, 14:00 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 26.7.0rc1
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade twisted to 26.7.0rc1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| twistedtwisted | Affected
| Fixed in
|
AI-suggested
Upgrade Twisted to version 26.7.0rc1 or later, where this origin validation error is fixed. Applications should avoid reusing DNSDatagramProtocol instances to reduce exposure. No other vendor advisories or patches are indicated. Patch status is confirmed fixed in 26.7.0rc1.
Description
Twisted versions prior to 26.7.0rc1 have an origin validation error in twisted.names.dns.DNSDatagramProtocol. The protocol accepts UDP DNS responses based solely on matching transaction IDs without verifying the source host and port. This flaw allows an attacker who can send packets to the resolver's listening port with a correct transaction ID to inject forged DNS answers. Such forgery can redirect hostname resolution, potentially enabling mail interception, server-side request forgery, or man-in-the-middle attacks. The issue is fixed in version 26.7.0rc1.
References
- github.com/twisted/twisted/security/advisories/GHSA-jj36-9pvh-vj5r (opens in a new tab)
- github.com/twisted/twisted/pull/12700 (opens in a new tab)
- github.com/twisted/twisted/commit/b53e1c3477c209b5609a1c74cf9e48373b5879ac (opens in a new tab)
- github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1 (opens in a new tab)