Description
In Varnish Cache before 6.6.2 and 7.x before 7.0.2, Varnish Cache 6.0 LTS before 6.0.10, and and Varnish Enterprise (Cache Plus) 4.1.x before 4.1.11r6 and 6.0.x before 6.0.9r4, request smuggling can occur for HTTP/1 connections.
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 13 | varnish | 7.1.0-5 | — |
| Debian 12 | varnish | 7.1.0-5 | — |
| Debian 11 | varnish | 6.5.1-1+deb11u2 | DSA-5088-1 |
| Debian 10 | varnish | 6.1.1-1+deb10u3 | DSA-5088-1 |
| Debian 9 | varnish | 5.0.0-7+deb9u3 | DLA-2920-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | varnish | No fix yet | — |
| Ubuntu 26.04 LTS | varnish | No fix yet | — |
| Ubuntu 25.10 | varnish | No fix yet | — |
| Ubuntu 24.04 LTS | varnish | No fix yet | — |
| Ubuntu 22.04 LTS | varnish | 6.6.1-1ubuntu0.2 | USN-5474-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | varnish | 6.2.1-2ubuntu0.1 | USN-5474-1 |
| Ubuntu 18.04 LTS | varnish | 5.2.1-1ubuntu0.1 | USN-5474-1 |
| Ubuntu 14.04 LTS | varnish | No fix yet | — |
| Ubuntu Pro 16.04 LTS | varnish | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | varnish +2 | 6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 | RHSA-2022:0418 |
| RHEL 8 | varnish-modules | 0.15.0-6.module+el8.5.0+11976+0b4af72d | RHSA-2022:0418 |
| RHEL 3 | rh-varnish6-varnish +3 | 6.0.8-2.el7.1 | RHSA-2022:4745 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.4 EUS | varnish +2 | 6.0.6-2.module+el8.4.0+14090+331e4860.2 | RHSA-2022:0422 |
| RHEL 8.4 EUS | varnish-modules | 0.15.0-5.module+el8.3.0+6843+b3b42fcc | RHSA-2022:0422 |
| RHEL 8.2 EUS | varnish +2 | 6.0.2-2.module+el8.2.0+14091+b587eafb.1 | RHSA-2022:0421 |
| RHEL 8.2 EUS | varnish-modules | 0.15.0-4.module+el8+2481+4078e9d2 | RHSA-2022:0421 |
| RHEL 8.1 E4S | varnish +2 | 6.0.2-2.module+el8.1.0+14093+aa8ea65f.1 | RHSA-2022:0420 |
| RHEL 8.1 E4S | varnish-modules | 0.15.0-4.module+el8+2481+4078e9d2 | RHSA-2022:0420 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | varnish +2 | 6.0.8-1.module_el8.5.0+76+a10ffa55 | ALSA-2022:0418 |
| AlmaLinux 8 | varnish-modules | 0.15.0-6.module_el8.5.0+76+a10ffa55 | ALSA-2022:0418 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | varnish | 6.0.8-1.module+el8.5.0+677+2a78a869 | RLSA-2022:0418 |
| Rocky Linux 8 | varnish-modules | 0.15.0-6.module+el8.5.0+677+2a78a869 | RLSA-2022:0418 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP3 | varnish | 7.1.0-bp153.2.3.1 | openSUSE-SU-2022:0148-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | varnish | 7.1.0-1.1 | openSUSE-SU-2024:12086-1 |
| openSUSE Tumbleweed | vinyl-cache | 9.0.0-1.1 | openSUSE-SU-2026:10751-1 |
| openSUSE Leap 15.3 | varnish | 7.1.0-bp153.2.3.1 | openSUSE-SU-2022:0148-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | varnish | 7.0.2-r0 | — |
| Alpine v3.23 | varnish | 7.0.2-r0 | — |
| Alpine v3.22 | varnish | 7.0.2-r0 | — |
| Alpine v3.21 | varnish | 7.0.2-r0 | — |
| Alpine v3.20 | varnish | 7.0.2-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | varnish | 7.0.2-r0 | — |
| Alpine v3.18 | varnish | 7.0.2-r0 | — |
| Alpine v3.17 | varnish | 7.0.2-r0 | — |
| Alpine v3.16 | varnish | 7.0.2-r0 | — |
| Alpine v3.15 | varnish | 7.0.2-r0 | — |
| Alpine v3.14 | varnish | 6.6.2-r0 | — |
| Alpine v3.13 | varnish | 6.5.2-r1 | — |
| Alpine v3.12 | varnish | 6.5.2-r1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | varnish +2 | 6.0.8-1.module+el8.5.0+20491+1af4e193.1 | ELSA-2022-0418 |
| Oracle Linux 8 | varnish-modules | 0.15.0-6.module+el8.5.0+20320+0b4af72d | ELSA-2022-0418 |
Advisories 15
- ALSA-2022:0418 Important: varnish:6 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2022:4745 Red Hat Security Advisory: rh-varnish6-varnish security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:0422 Red Hat Security Advisory: varnish:6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:0421 Red Hat Security Advisory: varnish:6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:0420 Red Hat Security Advisory: varnish:6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:0418 Red Hat Security Advisory: varnish:6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- openSUSE-SU-2026:10751-1 libvinylapi3-9.0.0-1.1 on GA media SUSE / openSUSE Security Updates · May 12, 2026
- USN-5474-1 varnish vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5088-1 varnish - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2920-1 varnish - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:0418 Important: varnish:6 security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:12086-1 libvarnishapi3-7.1.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0148-1 Security update for varnish SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-0198 Varnish HTTP Cache: Schwachstelle ermöglicht Offenlegung von Informationen und Cache Poisoning BSI CERT-Bund (WID) · Nov 28, 2022
- ELSA-2022-0418 Important: varnish:6 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 3, 2022