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Back to active CVEs
Low · CVSS 3.1CVE-2026-83813

Twisted: DNS Response Spoofing in twisted.names Due to Missing Source Address ValidationCVE-2026-83813

Answer in brief

CVE-2026-83813 records a Low severity (CVSS 3.1) vulnerability in Twisted: DNS Response Spoofing in twisted.names Due to Missing Source Address Validation. The current sources do not mark it as known exploited. The current feed maps twisted/twisted (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 23, 2026Updated Oct 23, 2026Source checked Oct 23, 2026First seen by HOL Oct 23, 2026Material review Oct 23, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 3.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 3.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps twisted/twisted (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
twisted/twistedgeneric<26.7.0rc126.7.0rc1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for twisted/twisted.
  2. 2Review the reported fix. Update twisted/twisted to 26.7.0rc1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 23, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.names.dns.DNSDatagramProtocol accepts a UDP DNS response for a pending query when its 16-bit transaction ID matches but does not verify that the response came from the queried host and port. An attacker able to deliver a packet to the resolver's listening port with the correct transaction ID can inject a forged answer. The standard twisted.names.client.Resolver uses a new random source port for each query, increasing off-path attack complexity, while applications that reuse a DNSDatagramProtocol instance expose only the transaction-ID search space after the first query. A successful forgery can redirect hostname resolution and enable mail interception, server-side request forgery, or man-in-the-middle positioning. This issue is fixed in version 26.10.0rc1.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCHSame twisted/twisted package
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish XML Element Stream via an Unbounded Element TreeSame twisted/twisted package
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line BufferSame twisted/twisted package
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted conch Telnet Transport via an Unbounded Subnegotiation BufferSame twisted/twisted package
  • Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header ValueSame twisted/twisted package
  • WireGuard peer endpoint learned from unauthenticated transport-data messages allows off-path tunnel hijack in ZephyrAlso CWE-346

Record context

Vulnerability class
SSRF
EPSS
Not reported
CWE IDs
CWE-346
Source
CVE List V5
Source checked
Oct 23, 2026
References
4 linked sources
Open source record