Description
Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.
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 | 5.2-1 | — |
| Debian 13 | squid | 5.2-1 | — |
| Debian 12 | squid | 5.2-1 | — |
| Debian 11 | squid | 4.13-10+deb11u1 | DSA-5171-1 |
| Debian 10 | squid | 4.6-1+deb10u7 | DSA-5171-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | squid | 4.13-10ubuntu5 | — |
| Ubuntu 20.04 LTS | squid | 4.10-1ubuntu1.5 | USN-5104-1 |
| Ubuntu 18.04 LTS | squid3 | 3.5.27-1ubuntu1.12 | USN-5104-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | squid3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2022:1939 |
| RHEL 8 | squid | 7:4.15-3.module+el8.6.0+14176+9782b8ab | RHSA-2022:1939 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | libecap +1 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | ALSA-2022:1939 |
| AlmaLinux 8 | squid | 7:4.15-3.module_el8.6.0+2741+01592ae8 | ALSA-2022:1939 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | libecap | 1.0.1-2.module+el8.4.0+404+316a0dc5 | RLSA-2022:1939 |
| Rocky Linux 8 | squid | 7:4.15-3.module+el8.6.0+1044+67ab5d0a.2 | RLSA-2022:1939 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | squid | 4.17-5.29.1 | SUSE-SU-2021:3485-1 |
| SLES 15 SP2 | squid | 4.17-5.29.1 | SUSE-SU-2021:3485-1 |
| SLES 12 SP5 | squid | 4.17-4.21.1 | SUSE-SU-2021:3334-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | squid | 4.17-4.21.1 | SUSE-SU-2021:3334-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 5.2-1.1 | openSUSE-SU-2024:11559-1 |
| openSUSE Leap 15.3 | squid | 4.17-5.29.1 | openSUSE-SU-2021:3485-1 |
| openSUSE Leap 15.2 | squid | 4.17-lp152.2.12.1 | openSUSE-SU-2021:1419-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | squid | 5.2-r0 | — |
| Alpine v3.23 | squid | 5.2-r0 | — |
| Alpine v3.22 | squid | 5.2-r0 | — |
| Alpine v3.21 | squid | 5.2-r0 | — |
| Alpine v3.20 | squid | 5.2-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | squid | 5.2-r0 | — |
| Alpine v3.18 | squid | 5.2-r0 | — |
| Alpine v3.17 | squid | 5.2-r0 | — |
| Alpine v3.16 | squid | 5.2-r0 | — |
| Alpine v3.15 | squid | 5.2-r0 | — |
| Alpine v3.14 | squid | 5.0.6-r1 | — |
| Alpine v3.13 | squid | 5.0.6-r1 | — |
| Alpine v3.12 | squid | 4.17-r0 | — |
| Alpine v3.11 | squid | 4.17-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | squid +2 | 7:3.5.20-17.amzn2.7.10 | ALAS2-2023-2318 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | libecap +1 | 1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | ELSA-2022-1939 |
| Oracle Linux 8 | squid | 7:4.15-3.module+el8.6.0+20529+9782b8ab | ELSA-2022-1939 |
Advisories 13
- ALSA-2022:1939 Moderate: squid:4 security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- USN-5104-1 squid, squid3 vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- RHSA-2022:1939 Red Hat Security Advisory: squid:4 security and bug fix update Red Hat Security Advisories (RHSA) · Mar 23, 2026
- DSA-5171-1 squid - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:1939 Moderate: squid:4 security and bug fix update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2021:3334-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3485-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:3485-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11559-1 squid-5.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1419-1 Security update for squid SUSE / openSUSE Security Updates · May 7, 2025
- ALAS2-2023-2318 Critical: squid security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 6, 2023
- WID-SEC-2022-0481 Squid: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Oct 26, 2023
- ELSA-2022-1939 Moderate: squid:4 security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 17, 2022
References
- http://www.squid-cache.org/Versions/
- https://www.zerodayinitiative.com/advisories/ZDI-21-157/
- https://github.com/squid-cache/squid/security/advisories/GHSA-rgf3-9v3p-qp82
- GLSA-202105-14 vendor-advisory
- FEDORA-2021-c0bec55ec7 vendor-advisory
- FEDORA-2021-24af72ff2c vendor-advisory
- [oss-security] 20211004 CVE-2021-28116 / ZDI-CAN-11610 / SQUID-2020:12 Out-Of-Bounds memory access in WCCPv2 mailing-list
- DSA-5171 vendor-advisory