Description
SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote attacker to perform Request/Response smuggling past firewall and frontend security systems.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | squid | 2.6 – < 6.4 | 6.4 |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 8.2 Advanced Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.2 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.0 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
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 | squid | 6.5-1 | — |
| Debian 13 | squid | 6.5-1 | — |
| Debian 12 | squid | 5.7-2+deb12u1 | DSA-5637-1 |
| Debian 11 | squid | 4.13-10+deb11u3 | DSA-5637-1 |
| Debian 10 | squid | 4.6-1+deb10u9 | DLA-3709-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | squid | 6.1-2ubuntu2 | — |
| Ubuntu 22.04 LTS | squid | 5.7-0ubuntu0.22.04.2 | USN-6500-1 |
| Ubuntu 20.04 LTS | squid | 4.10-1ubuntu1.8 | USN-6500-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | squid3 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | squid3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | squid | 7:5.5-5.el9_2.1 | RHSA-2023:6748, RHSA-2023:6266 |
| RHEL 8 | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2023:7213, RHSA-2023:6267 |
| RHEL 8 | squid | 7:4.15-6.module+el8.8.0+20569+26050b0f.1 | RHSA-2023:7213, RHSA-2023:6267 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | squid | 7:5.2-1.el9_0.3 | RHSA-2023:6268 |
| RHEL 8.6 EUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2023:6801 |
| RHEL 8.6 EUS | squid | 7:4.15-3.module+el8.6.0+20581+c33b42aa.3 | RHSA-2023:6801 |
| RHEL 8.4 TUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2023:6804 |
| RHEL 8.4 TUS | squid | 7:4.11-4.module+el8.4.0+20587+c1238193.5 | RHSA-2023:6804 |
| RHEL 8.4 E4S | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2023:6804 |
| RHEL 8.4 E4S | squid | 7:4.11-4.module+el8.4.0+20587+c1238193.5 | RHSA-2023:6804 |
| RHEL 8.4 AUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2023:6804 |
| RHEL 8.4 AUS | squid | 7:4.11-4.module+el8.4.0+20587+c1238193.5 | RHSA-2023:6804 |
| RHEL 8.2 TUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2023:6803 |
| RHEL 8.2 TUS | squid | 7:4.4-8.module+el8.2.0+20588+7f9884cb.6 | RHSA-2023:6803 |
| RHEL 8.2 E4S | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2023:6803 |
| RHEL 8.2 E4S | squid | 7:4.4-8.module+el8.2.0+20588+7f9884cb.6 | RHSA-2023:6803 |
| RHEL 8.2 AUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2023:6803 |
| RHEL 8.2 AUS | squid | 7:4.4-8.module+el8.2.0+20588+7f9884cb.6 | RHSA-2023:6803 |
| RHEL 8.1 E4S | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2023:6810 |
| RHEL 8.1 E4S | squid | 7:4.4-8.module+el8.1.0+20589+bb91f53c.6 | RHSA-2023:6810 |
| RHEL 7 ELS | squid +2 | 7:3.5.20-17.el7_9.13 | RHSA-2024:11049 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | squid | 7:5.5-5.el9_2.1 | ALSA-2023:6748, ALSA-2023:6266 |
| AlmaLinux 8 | libecap +1 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | ALSA-2023:7213, ALSA-2023:6267 |
| AlmaLinux 8 | squid | 7:4.15-6.module_el8.8.0+3670+56cb3c8e.1.alma.1 | ALSA-2023:7213, ALSA-2023:6267 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | squid | 7:5.5-5.el9_2.1 | RLSA-2023:6266 |
| Rocky Linux 8 | libecap | 1.0.1-2.module+el8.4.0+404+316a0dc5 | RLSA-2023:7213, RLSA-2023:6267 |
| Rocky Linux 8 | squid | 7:4.15-6.module+el8.8.0+1273+55f5b063 | RLSA-2023:7213, RLSA-2023:6267 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | squid | 5.7-150400.3.12.1 | SUSE-SU-2023:4380-1 |
| SLES 15 SP4 | squid | 5.7-150400.3.12.1 | SUSE-SU-2023:4380-1 |
| SLES 15 SP3 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
| SLES 15 SP2 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
| SLES 15 SP1 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | squid | 4.17-4.30.1 | SUSE-SU-2023:4381-1 |
| SLES for SAP 15 SP3 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
| SLES for SAP 15 SP2 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
| SLES for SAP 15 SP1 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
| SLES for SAP 12 SP5 | squid | 4.17-4.30.1 | SUSE-SU-2023:4381-1 |
| SLE HPC 15 SP3 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
| SLE HPC 15 SP2 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
| SLE HPC 15 SP1 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
| SUSE Enterprise Storage 7.1 | squid | 4.17-150000.5.38.1 | SUSE-SU-2023:4384-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 6.4-1.1 | openSUSE-SU-2024:13398-1 |
| openSUSE Leap 15.5 | squid | 5.7-150400.3.12.1 | SUSE-SU-2023:4380-1 |
| openSUSE Leap 15.4 | squid | 5.7-150400.3.12.1 | SUSE-SU-2023:4380-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | squid | 6.4-r0 | — |
| Alpine v3.23 | squid | 6.4-r0 | — |
| Alpine v3.22 | squid | 6.4-r0 | — |
| Alpine v3.21 | squid | 6.4-r0 | — |
| Alpine v3.20 | squid | 6.4-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | squid | 6.4-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | squid | 7:5.8-1.amzn2023.0.2 | ALAS2023-2023-429 |
| Amazon Linux 2 | squid +2 | 7:3.5.20-17.amzn2.7.20 | ALAS2-2024-2509 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | squid | 6.4-1 | — |
| Azure Linux 2 (CBL-Mariner) | squid | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | squid | 7:5.5-5.el9_2.1 | ELSA-2023-6748, ELSA-2023-6266 |
| Oracle Linux 8 | libecap +1 | 1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | ELSA-2023-7213, ELSA-2023-6267 |
| Oracle Linux 8 | squid | 7:4.15-6.0.1.module+el8.8.0+90059+985ac402 | ELSA-2023-7213, ELSA-2023-6267 |
| Oracle Linux 7 | squid +2 | 7:3.5.20-17.0.5.el7_9.13 | ELSA-2024-11049 |
Advisories 33
- ALSA-2023:6748 Critical: squid security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:6266 Critical: squid security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:6267 Critical: squid:4 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:7213 Critical: squid:4 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2023-2725 Squid: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 26, 2026
- RHSA-2023:7213 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:6810 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:6804 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:6801 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:6803 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:6748 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:6268 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:6266 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:6267 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2024:11049 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-6500-1 squid vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5637-1 squid - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3709-1 squid - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:6267 Critical: squid:4 security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2023:7213 Critical: squid:4 security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2023:6266 Critical: squid security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:13398-1 squid-6.4-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4380-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4384-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4381-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2024-11049 Important: squid security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 5, 2025
- WID-SEC-2024-1248 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 21, 2024
- ALAS2-2024-2509 Important: squid security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 27, 2024
- ALAS2023-2023-429 Important: squid security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Dec 6, 2023
- ELSA-2023-7213 Critical: squid:4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 22, 2023
- ELSA-2023-6748 Critical: squid security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 16, 2023
- ELSA-2023-6267 Critical: squid:4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 7, 2023
- ELSA-2023-6266 Critical: squid security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 3, 2023
References
- RHSA-2023:6266 vendor-advisory
- RHSA-2023:6267 vendor-advisory
- RHSA-2023:6268 vendor-advisory
- RHSA-2023:6748 vendor-advisory
- RHSA-2023:6801 vendor-advisory
- RHSA-2023:6803 vendor-advisory
- RHSA-2023:6804 vendor-advisory
- RHSA-2023:6810 vendor-advisory
- RHSA-2023:7213 vendor-advisory
- RHSA-2024:11049 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2023-46846 vdb-entry
- RHBZ#2245910 issue-tracking
- https://github.com/squid-cache/squid/security/advisories/GHSA-j83v-w3p4-5cqh