3.1

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

Awaiting analysis
AliasesDEBIAN-CVE-2026-83813UBUNTU-CVE-2026-83813GHSA-jj36-9pvh-vj5r
Published 23-10-2026Last modified 29-10-2026

Vulnerability summary

CVE-2026-83813 is a low (CVSS 3.1) Origin Validation Error vulnerability in twisted. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.1, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
3.1/10
010
Low · v3.1 (CVE.org)
EPSS score
0.11%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:12381-1

Timeline

  1. 23-10-2026
    PublishedVulnerability first disclosed.
  2. 29-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.11%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

24-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard2 products
  • awxAll versions (No fix recorded)
  • synapseAll versions (No fix recorded)
Debian1 product
  • twistedAll versions (No fix recorded) | < 26.10.0-1
PyPI1 product
  • twisted< 26.10.0rc1
Twisted1 product
Ubuntu1 product
  • twistedAll versions (No fix recorded)

5 vendors · 6 products

References

9 links