VIR Vulnerability Intelligence Relay

CVE-2026-42304

high
Published 2026-05-13 · Modified 2026-05-20
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CVSS v3
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4 NEW
—
not yet in upstream
VIR risk
7.5

Description

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.4.0rc2, the twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthenticated attacker can exploit this by sending a crafted TCP DNS packet containing deeply chained compression pointers. This flaw bypasses previous loop-prevention logic, causing the single-threaded Twisted reactor to hang while processing millions of recursive lookups, effectively freezing the server. This vulnerability is fixed in 26.4.0rc2.

Predictions

Exploit likelihood
83%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact
OSVersionStatusFixed in
suse slesaffected
debian debianbookwormaffected
debian debianbullseyeaffected
debian debianforkyaffected
debian debiansidfixed26.4.0-1
debian debiantrixieaffected
windows windowsaffected

Package impact
EcosystemPackageVulnerableFixed
python PyPItwisted<26.4.0rc226.4.0rc2
python PyPItwisted<26.4.026.4.0
PIPTwisted<= 25.5.026.4.0rc2

Application impact
VendorProductVersionsFixed
twistedtwisted{"endExcluding":"26.4.0"}26.4.0
twistedtwisted26.4.0

References

CWEs

CWE-400 CWE-407

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.