Description
Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to Input Validation, Premature Release of Resource During Expected Lifetime, and Missing Release of Resource after Effective Lifetime bugs, Squid is vulnerable to Denial of Service attacks by a trusted server against all clients using the proxy. This bug is fixed in the default build configuration of Squid version 6.10.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| squid-cache | squid | >= 3.0, < 6.10 | — |
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 | 6.12-1 | — |
| Debian 13 | squid | 6.12-1 | — |
| Debian 12 | squid | 5.7-2+deb12u5 | — |
| Debian 11 | squid | 4.13-10+deb11u4 | DLA-4083-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | squid | No fix yet | — |
| Ubuntu 22.04 LTS | squid | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | squid | No fix yet | — |
| 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 | 7:5.5-14.el9_5.3 | RHSA-2024:9625 |
| RHEL 8 | libecap +1 | 1.0.1-2.module+el8.9.0+19703+a1da7223 | RHSA-2024:9644 |
| RHEL 8 | squid | 7:4.15-10.module+el8.10.0+22489+b920747d.3 | RHSA-2024:9644 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | squid | 7:5.5-13.el9_4.2 | RHSA-2024:9678 |
| RHEL 9.2 EUS | squid | 7:5.5-5.el9_2.8 | RHSA-2024:9677 |
| RHEL 9.0 E4S | squid | 7:5.2-1.el9_0.7 | RHSA-2024:9729 |
| RHEL 8.8 EUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2024:9813 |
| RHEL 8.8 EUS | squid | 7:4.15-6.module+el8.8.0+22494+5019dde6.7 | RHSA-2024:9813 |
| RHEL 8.6 TUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2024:9814 |
| RHEL 8.6 TUS | squid | 7:4.15-3.module+el8.6.0+22491+132fca59.7 | RHSA-2024:9814 |
| RHEL 8.6 E4S | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2024:9814 |
| RHEL 8.6 E4S | squid | 7:4.15-3.module+el8.6.0+22491+132fca59.7 | RHSA-2024:9814 |
| RHEL 8.6 AUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2024:9814 |
| RHEL 8.6 AUS | squid | 7:4.15-3.module+el8.6.0+22491+132fca59.7 | RHSA-2024:9814 |
| RHEL 8.4 TUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2024:9815 |
| RHEL 8.4 TUS | squid | 7:4.11-4.module+el8.4.0+22483+0c92772a.9 | RHSA-2024:9815 |
| RHEL 8.4 E4S | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2024:9815 |
| RHEL 8.4 E4S | squid | 7:4.11-4.module+el8.4.0+22483+0c92772a.9 | RHSA-2024:9815 |
| RHEL 8.4 AUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2024:9815 |
| RHEL 8.4 AUS | squid | 7:4.11-4.module+el8.4.0+22483+0c92772a.9 | RHSA-2024:9815 |
| RHEL 8.2 AUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2024:9624 |
| RHEL 8.2 AUS | squid | 7:4.4-8.module+el8.2.0+22482+3b9510d6.10 | RHSA-2024:9624 |
| RHEL 7 ELS | squid +2 | 7:3.5.20-17.el7_9.11 | RHSA-2024:9738 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | squid | 7:5.5-14.el9_5.3 | ALSA-2024:9625 |
| AlmaLinux 8 | libecap +1 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | ALSA-2024:9644 |
| AlmaLinux 8 | squid | 7:4.15-10.module_el8.10.0+3916+ed00a4a0.3 | ALSA-2024:9644 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | squid | 7:5.5-14.el9_5.3 | RLSA-2024:9625 |
| Rocky Linux 8 | libecap | 1.0.1-2.module+el8.9.0+1437+df5ea8f0 | RLSA-2024:9644 |
| Rocky Linux 8 | squid | 7:4.15-10.module+el8.10.0+1758+80ba9f4b | RLSA-2024:9644 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 6.12-1.1 | openSUSE-SU-2024:14566-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | squid | 7:6.13-1.amzn2023.0.1 | ALAS2023-2025-857 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | squid | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | squid | 7:5.5-14.el9_5.3 | ELSA-2024-9625 |
| Oracle Linux 8 | libecap +1 | 1.0.1-2.module+el8.9.0+90083+f7556140 | ELSA-2024-9644 |
| Oracle Linux 8 | squid | 7:4.15-10.module+el8.10.0+90442+8ef3f586.3 | ELSA-2024-9644 |
| Oracle Linux 7 | squid +2 | 7:3.5.20-17.0.3.el7_9.10 | ELSA-2024-9738 |
Advisories 22
- WID-SEC-2024-3280 Squid: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Nov 10, 2026
- ALSA-2024:9625 Important: squid security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:9644 Important: squid:4 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:9815 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:9814 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:9738 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:9813 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:9729 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:9677 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:9678 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:9644 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:9625 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2024:9624 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- DLA-4083-1 squid - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:9644 Important: squid:4 security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:9625 Important: squid security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:14566-1 squid-6.12-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1850 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 17, 2025
- ALAS2023-2025-857 Moderate: squid security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 21, 2025
- ELSA-2024-9738 Important: squid security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 20, 2024
- ELSA-2024-9625 Important: squid security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 18, 2024
- ELSA-2024-9644 Important: squid security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 15, 2024