Description
An HTTP Request Forgery issue was discovered in Varnish Cache 5.x and 6.x before 6.0.11, 7.x before 7.1.2, and 7.2.x before 7.2.1. An attacker may introduce characters through HTTP/2 pseudo-headers that are invalid in the context of an HTTP/1 request line, causing the Varnish server to produce invalid HTTP/1 requests to the backend. This could, in turn, be used to exploit vulnerabilities in a server behind the Varnish server. Note: the 6.0.x LTS series (before 6.0.11) is affected.
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 | 7.1.1-1.1 | — |
| Debian 12 | varnish | 7.1.1-1.1 | — |
| Debian 11 | varnish | 6.5.1-1+deb11u3 | DSA-5334-1 |
| Debian 10 | varnish | 6.1.1-1+deb10u4 | DLA-3208-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | varnish | 6.6.1-1ubuntu0.2+esm1 | USN-7372-1 |
| Ubuntu Pro 20.04 LTS | varnish | 6.2.1-2ubuntu0.2+esm1 | USN-7372-1 |
| Ubuntu Pro 18.04 LTS | varnish | 5.2.1-1ubuntu0.1+esm1 | USN-7372-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | varnish +2 | 6.6.2-2.el9_1.1 | RHSA-2022:8643 |
| RHEL 8 | varnish +2 | 6.0.8-2.module+el8.7.0+17239+94d153bd.1 | RHSA-2022:8649 |
| RHEL 8 | varnish-modules | 0.15.0-6.module+el8.5.0+11976+0b4af72d | RHSA-2022:8649 |
| RHEL 3 | rh-varnish6-varnish +3 | 6.0.8-2.el7.2 | RHSA-2023:0673 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | varnish +2 | 6.6.2-2.el9_0.1 | RHSA-2022:8644 |
| RHEL 8.6 EUS | varnish +2 | 6.0.8-2.module+el8.6.0+17240+b7b5e45c.1 | RHSA-2022:8650 |
| RHEL 8.6 EUS | varnish-modules | 0.15.0-6.module+el8.5.0+11976+0b4af72d | RHSA-2022:8650 |
| RHEL 8.4 EUS | varnish +2 | 6.0.6-2.module+el8.4.0+17241+96fc0d9c.3 | RHSA-2022:8645 |
| RHEL 8.4 EUS | varnish-modules | 0.15.0-5.module+el8.3.0+6843+b3b42fcc | RHSA-2022:8645 |
| RHEL 8.2 TUS | varnish +2 | 6.0.2-2.module+el8.2.0+17242+97092129.2 | RHSA-2022:8646 |
| RHEL 8.2 TUS | varnish-modules | 0.15.0-4.module+el8+2481+4078e9d2 | RHSA-2022:8646 |
| RHEL 8.2 E4S | varnish +2 | 6.0.2-2.module+el8.2.0+17242+97092129.2 | RHSA-2022:8646 |
| RHEL 8.2 E4S | varnish-modules | 0.15.0-4.module+el8+2481+4078e9d2 | RHSA-2022:8646 |
| RHEL 8.2 AUS | varnish +2 | 6.0.2-2.module+el8.2.0+17242+97092129.2 | RHSA-2022:8646 |
| RHEL 8.2 AUS | varnish-modules | 0.15.0-4.module+el8+2481+4078e9d2 | RHSA-2022:8646 |
| RHEL 8.1 E4S | varnish +2 | 6.0.2-2.module+el8.1.0+17243+35307414.2 | RHSA-2022:8647 |
| RHEL 8.1 E4S | varnish-modules | 0.15.0-4.module+el8+2481+4078e9d2 | RHSA-2022:8647 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | varnish +2 | 6.6.2-2.el9_1.1 | ALSA-2022:8643 |
| AlmaLinux 8 | varnish +2 | 6.0.8-2.module_el8.7.0+3353+b11d8f2f.1 | ALSA-2022:8649 |
| AlmaLinux 8 | varnish-modules | 0.15.0-6.module_el8.5.0+76+a10ffa55 | ALSA-2022:8649 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | varnish | 6.6.2-2.el9_1.1 | RLSA-2022:8643 |
| Rocky Linux 8 | varnish | 6.0.8-2.module+el8.7.0+1094+66cdd070.1 | RLSA-2022:8649 |
| Rocky Linux 8 | varnish-modules | 0.15.0-6.module+el8.5.0+677+2a78a869 | RLSA-2022:8649 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP4 | varnish | 7.2.1-bp154.2.9.1 | openSUSE-SU-2022:10198-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | varnish | 7.2.1-1.1 | openSUSE-SU-2024:12496-1 |
| openSUSE Tumbleweed | vinyl-cache | 9.0.0-1.1 | openSUSE-SU-2026:10751-1 |
| openSUSE Leap 15.4 | varnish | 7.2.1-bp154.2.9.1 | openSUSE-SU-2022:10198-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | varnish | 7.2.1-r0 | — |
| Alpine v3.23 | varnish | 7.2.1-r0 | — |
| Alpine v3.22 | varnish | 7.2.1-r0 | — |
| Alpine v3.21 | varnish | 7.2.1-r0 | — |
| Alpine v3.20 | varnish | 7.2.1-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | varnish | 7.2.1-r0 | — |
| Alpine v3.18 | varnish | 7.2.1-r0 | — |
| Alpine v3.17 | varnish | 7.2.1-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | varnish +2 | 6.6.2-2.el9_1.1 | ELSA-2022-8643 |
| Oracle Linux 8 | varnish +2 | 6.0.8-2.module+el8.7.0+20885+cb213da4.1 | ELSA-2022-8649 |
| Oracle Linux 8 | varnish-modules | 0.15.0-6.module+el8.5.0+20320+0b4af72d | ELSA-2022-8649 |
Advisories 21
- ALSA-2022:8643 Important: varnish security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:8649 Important: varnish:6 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-2036 Varnish HTTP Cache: Mehrere Schwachstellen ermöglichen Manipulation von Dateien BSI CERT-Bund (WID) · Aug 26, 2026
- RHSA-2023:0673 Red Hat Security Advisory: rh-varnish6-varnish security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:8650 Red Hat Security Advisory: varnish:6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:8647 Red Hat Security Advisory: varnish:6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:8649 Red Hat Security Advisory: varnish:6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:8645 Red Hat Security Advisory: varnish:6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:8646 Red Hat Security Advisory: varnish:6 security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:8644 Red Hat Security Advisory: varnish security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:8643 Red Hat Security Advisory: varnish 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-7372-1 varnish vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5334-1 varnish - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3208-1 varnish - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:8643 Important: varnish security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2022:8649 Important: varnish:6 security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2022:10198-1 Security update for varnish SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12496-1 libvarnishapi3-7.2.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2022-8643 Important: varnish security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 29, 2022
- ELSA-2022-8649 Important: varnish:6 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 28, 2022
References
- https://varnish-cache.org/security/VSV00011.html
- https://docs.varnish-software.com/security/VSV00011
- FEDORA-2022-babfbc2622 vendor-advisory
- FEDORA-2022-0d5dcc031e vendor-advisory
- FEDORA-2022-99c5ddb2ae vendor-advisory
- [debian-lts-announce] 20221127 [SECURITY] [DLA 3208-1] varnish security update mailing-list
- DSA-5334 vendor-advisory