Description
An issue was discovered in Squid 4.9 through 4.17 and 5.0.6 through 5.6. Due to inconsistent handling of internal URIs, there can be Exposure of Sensitive Information about clients using the proxy via an HTTPS request to an internal cache manager URL. This is fixed in 5.7.
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 | 5.7-1 | — |
| Debian 13 | squid | 5.7-1 | — |
| Debian 12 | squid | 5.7-1 | — |
| Debian 11 | squid | 4.13-10+deb11u2 | DSA-5258-1 |
| Debian 10 | squid | 4.6-1+deb10u8 | DLA-3151-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | squid | 5.2-1ubuntu4.2 | USN-5641-1 |
| Ubuntu 20.04 LTS | squid | 4.10-1ubuntu1.7 | USN-5641-1 |
| Ubuntu 18.04 LTS | squid3 | 3.5.27-1ubuntu1.14 | USN-5641-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | squid | 5.7-150400.3.6.1 | SUSE-SU-2022:3531-1 |
| SLES 15 SP3 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SLES 15 SP2 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SLES 15 SP1 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SLES 15 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | squid | 4.17-4.27.1 | SUSE-SU-2022:3532-1 |
| SLES 12 SP4 | squid | 3.5.21-26.38.1 | SUSE-SU-2022:3533-1 |
| SLES 12 SP3 | squid | 3.5.21-26.38.1 | SUSE-SU-2022:3533-1 |
| SLES 12 SP2 | squid | 3.5.21-26.38.1 | SUSE-SU-2022:3533-1 |
| SLES for SAP 15 SP2 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SLES for SAP 15 SP1 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SLES for SAP 15 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SLES for SAP 12 SP5 | squid | 4.17-4.27.1 | SUSE-SU-2022:3532-1 |
| SLES for SAP 12 SP4 | squid | 3.5.21-26.38.1 | SUSE-SU-2022:3533-1 |
| SLE HPC 15 SP2 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SLE HPC 15 SP1 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SLE HPC 15 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SUSE OpenStack Cloud Crowbar 9 | squid | 3.5.21-26.38.1 | SUSE-SU-2022:3533-1 |
| SUSE OpenStack Cloud 9 | squid | 3.5.21-26.38.1 | SUSE-SU-2022:3533-1 |
| SUSE Manager Server 4.1 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SUSE Manager Retail Branch Server 4.1 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SUSE Manager Proxy 4.1 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SUSE Enterprise Storage 7 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
| SUSE Enterprise Storage 6 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 5.7-2.1 | openSUSE-SU-2024:12364-1 |
| openSUSE Leap 15.4 | squid | 5.7-150400.3.6.1 | SUSE-SU-2022:3531-1 |
| openSUSE Leap 15.3 | squid | 4.17-150000.5.35.1 | SUSE-SU-2022:3596-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | squid | 5.7-r0 | — |
| Alpine v3.23 | squid | 5.7-r0 | — |
| Alpine v3.22 | squid | 5.7-r0 | — |
| Alpine v3.21 | squid | 5.7-r0 | — |
| Alpine v3.20 | squid | 5.7-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | squid | 5.7-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | squid +2 | 7:3.5.20-17.amzn2.7.2 | ALAS2-2023-1950 |
Advisories 10
- DSA-5258-1 squid - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3151-1 squid - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-5641-1 squid, squid3 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2024:12364-1 squid-5.7-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3531-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3596-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3532-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-1505 Squid: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- SUSE-SU-2022:3533-1 Security update for squid SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2023-1950 Moderate: squid security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 22, 2023