PYSEC-2026-160

See a problem?
Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/twisted/PYSEC-2026-160.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-160
Aliases
Published
2026-05-13T21:16:46.933Z
Modified
2026-05-20T12:35:31.546681Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

PyPI / twisted

Package

Name
twisted
View open source insights on deps.dev
Purl
pkg:pypi/twisted

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
26.4.0

Affected versions

1.*
1.0.1
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.1.0
1.1.1
1.2.0
2.*
2.1.0
2.4.0
2.5.0
8.*
8.0.0
8.0.1
8.1.0
8.2.0
9.*
9.0.0
10.*
10.0.0
10.1.0
10.2.0
11.*
11.0.0
11.1.0
12.*
12.0.0
12.1.0
12.2.0
12.3.0
13.*
13.0.0
13.1.0
13.2.0
14.*
14.0.0
14.0.1
14.0.2
15.*
15.0.0
15.1.0
15.2.0
15.2.1
15.3.0
15.4.0
15.5.0
16.*
16.0.0
16.1.0
16.1.1
16.2.0
16.3.0
16.3.1
16.3.2
16.4.0
16.4.1
16.5.0rc1
16.5.0rc2
16.5.0
16.6.0rc1
16.6.0
16.7.0rc1
16.7.0rc2
17.*
17.1.0rc1
17.1.0
17.5.0
17.9.0rc1
17.9.0
18.*
18.4.0rc1
18.4.0
18.7.0rc1
18.7.0rc2
18.7.0
18.9.0rc1
18.9.0
19.*
19.2.0rc1
19.2.0rc2
19.2.0
19.2.1
19.7.0rc1
19.7.0
19.10.0rc1
19.10.0
20.*
20.3.0rc1
20.3.0
21.*
21.2.0rc1
21.2.0
21.7.0rc1
21.7.0rc2
21.7.0rc3
21.7.0
22.*
22.1.0rc1
22.1.0
22.2.0rc1
22.2.0
22.4.0rc1
22.4.0
22.8.0rc1
22.8.0
22.10.0rc1
22.10.0
23.*
23.8.0rc1
23.8.0
23.10.0rc1
23.10.0
24.*
24.2.0rc1
24.3.0
24.7.0rc1
24.7.0rc2
24.7.0
24.10.0rc1
24.10.0
24.11.0rc1
24.11.0rc2
24.11.0
25.*
25.5.0rc1
25.5.0
26.*
26.4.0rc2

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/twisted/PYSEC-2026-160.yaml"