Description
Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs in HTTP Request messages or constructing ftp:// URLs from FTP Native input.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | squid | 5.0.3 – < 6.4 | 6.4 |
| 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 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
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 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 |
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 |
Show 1 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 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | squid | 7:5.5-5.el9_2.1 | ALSA-2023:6748, ALSA-2023:6266 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | squid | 7:5.5-5.el9_2.1 | RLSA-2023:6266 |
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 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | squid | No fix yet | — |
| 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 |
Advisories 16
- 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
- WID-SEC-2023-2725 Squid: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 26, 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
- USN-6500-1 squid vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 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
- WID-SEC-2024-1248 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 21, 2024
- ALAS2023-2023-429 Important: squid security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Dec 6, 2023
- ELSA-2023-6748 Critical: squid security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 16, 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-2023:6268 vendor-advisory
- RHSA-2023:6748 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2023-46848 vdb-entry
- RHBZ#2245919 issue-tracking
- https://github.com/squid-cache/squid/security/advisories/GHSA-2g3c-pg7q-g59w