Description
Twisted before 16.3.1 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect CGI applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect a CGI application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue.
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 | twisted | 16.4.0-1 | — |
| Debian 13 | twisted | 16.4.0-1 | — |
| Debian 12 | twisted | 16.4.0-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | twisted | 16.0.0-1ubuntu0.2 | USN-3585-1 |
| Ubuntu 14.04 LTS | twisted | 13.2.0-1ubuntu1.2 | USN-3585-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | python-twisted-web | 12.1.0-5.el7_2 | RHSA-2016:1978 |
| RHEL 6 | python-twisted-web | 8.2.0-5.el6_8 | RHSA-2016:1978 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Satellite Capsule 6 | foreman +1 | 1.11.0.86-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | foreman-installer | 1:1.11.0.18-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | katello +3 | 3.0.0-33.el6sat | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | katello-installer-base +1 | 3.0.0.101-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | pulp +13 | 2.8.7.18-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | pulp-puppet +3 | 2.8.7.2-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | python-twisted-web | 12.1.0-5.el7_2 | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | qpid-dispatch +3 | 0.4-27.el6sat | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | qpid-proton +2 | 0.9-21.el6 | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | rubygem-smart_proxy_openscap | 0.5.3.9-2.el6sat | RHSA-2018:0273 |
| Red Hat Satellite Capsule 6 | satellite +2 | 6.2.14-4.0.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | candlepin +1 | 0.9.54.26-1.el6 | RHSA-2018:0273 |
| Red Hat Satellite 6 | foreman +10 | 1.11.0.86-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | foreman-installer | 1:1.11.0.18-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | katello +4 | 3.0.0-33.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | katello-installer-base +1 | 3.0.0.101-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | pulp +10 | 2.8.7.18-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | pulp-puppet +4 | 2.8.7.2-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | python-twisted-web | 12.1.0-5.el7_2 | RHSA-2018:0273 |
| Red Hat Satellite 6 | qpid-dispatch +3 | 0.4-27.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | qpid-proton +2 | 0.9-21.el6 | RHSA-2018:0273 |
| Red Hat Satellite 6 | rubygem-smart_proxy_openscap | 0.5.3.9-2.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | satellite +3 | 6.2.14-4.0.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | tfm-rubygem-foreman_theme_satellite | 0.1.47.2-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | tfm-rubygem-katello | 3.0.0.162-1.el6sat | RHSA-2018:0273 |
| Red Hat Satellite 6 | tfm-rubygem-katello_ostree | 3.0.0.162-1.el7sat | RHSA-2018:0273 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | python-Twisted | 15.2.1-8.1 | SUSE-SU-2017:0114-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Enterprise Storage 4 | python-Twisted | 15.2.1-8.1 | SUSE-SU-2017:0114-1 |
| SUSE Enterprise Storage 3 | python-Twisted | 15.2.1-8.1 | SUSE-SU-2017:0114-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-Twisted | 16.4.1-1.2 | openSUSE-SU-2024:10162-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.23 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.22 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.21 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.20 | py3-twisted | 16.4.0-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.18 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.17 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.16 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.15 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.14 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.13 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.12 | py3-twisted | 16.4.0-r0 | — |
| Alpine v3.11 | py3-twisted | 16.4.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | python-twisted-web | 12.1.0-5.el7_2 | ELSA-2016-1978 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | twisted | < 16.3.1 | 16.3.1 | GHSA-3gqj-cmxr-p4x2 |
Advisories 7
- RHSA-2018:0273 Red Hat Security Advisory: Red Hat Satellite 6 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2016:1978 Red Hat Security Advisory: python-twisted-web security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3585-1 twisted vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:0114-1 Security update for python-Twisted SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10162-1 python3-Twisted-16.4.1-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-2522 Mehrere Webserver: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Nov 10, 2025
- ELSA-2016-1978 Important: python-twisted-web security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 29, 2016