Description
dnspython is a DNS toolkit for Python. Prior to 2.9.0, dns.name.from_wire_parser follows attacker-controlled DNS compression pointer chains without a hop limit. A malicious DNS wire-format message can force excessive pointer traversal during name decompression, causing high CPU use, application degradation, or denial of service in applications that process untrusted DNS messages. This issue is fixed in version 2.9.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| rthalley | dnspython | < 2.9.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dnspython | 2.8.0-7 | — |
| Debian 13 | dnspython | No fix yet | — |
| Debian 12 | dnspython | 2.3.0-1+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | dnspython | No fix yet | — |
| Ubuntu 26.04 LTS | dnspython | No fix yet | — |
| Ubuntu 24.04 LTS | dnspython | No fix yet | — |
| Ubuntu 22.04 LTS | dnspython | No fix yet | — |
| Ubuntu 20.04 LTS | dnspython | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | dnspython | No fix yet | — |
| Ubuntu 16.04 LTS | dnspython | No fix yet | — |
| Ubuntu 14.04 LTS | dnspython | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | python-dns +1 | 1.15.0-13.el8_10 | RHSA-2026:94749 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | python3-dns | 1.15.0-13.el8_10 | ALSA-2026:94749 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | python-dns | 1.15.0-13.el8_10 | RLSA-2026:94749 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | python3-dns +2 | 2.1.0-3.amzn2023.0.5 | ALAS2023-2026-3357 |
| Amazon Linux 2 | python-dns | 1.12.0-4.20150617git465785f.amzn2.0.2 | ALAS2-2026-4062 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | python-dns | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | python3-dns | 1.15.0-13.el8_10 | ELSA-2026-94749 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | datadog-agent-7.78-core-integrations | 7.78.4-r29 | — |
| Wolfi rolling | datadog-agent-7.79-core-integrations +1 | No fix yet | — |
| Wolfi rolling | datadog-agent-7.81-core-integrations | 7.81.3-r17 | — |
| Wolfi rolling | py3-cassandra-medusa | 0.31.1-r0 | — |
| Wolfi rolling | superset-6.0 | 6.0.0-r24 | — |
| Wolfi rolling | superset-6.1 | 6.1.0-r19 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | dnspython | < 2.9.0 | 2.9.0 | GHSA-45c3-73f7-pv4m |
Advisories 7
- RHSA-2026:94749 Red Hat Security Advisory: python-dns security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- WID-SEC-2026-4305 Red Hat Enterprise Linux (dpdk, raptor2, dnspython): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- ALSA-2026:94749 Important: python-dns security update AlmaLinux Security Advisories · Nov 4, 2026
- RLSA-2026:94749 Important: python-dns security update Rocky Linux Security Advisories · Nov 4, 2026
- ELSA-2026-94749 Important: python-dns security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 3, 2026
- ALAS2023-2026-3357 Important: python-dns security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 2, 2026
- ALAS2-2026-4062 Important: python-dns security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 2, 2026