Description
A buffer over-read was discovered in libntlmauth in Squid 2.5 through 5.6. Due to incorrect integer-overflow protection, the SSPI and SMB authentication helpers are vulnerable to reading unintended memory locations. In some configurations, cleartext credentials from these locations are sent to a client. 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 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | squid3 | 3.5.27-1ubuntu1.14+esm2 | USN-6857-1 |
| Ubuntu Pro 16.04 LTS | squid3 | 3.5.12-1ubuntu7.16+esm3 | USN-6857-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | squid | 7:5.2-1.el9_0.2 | RHSA-2022:6839 |
| RHEL 8 | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2022:6775 |
| RHEL 8 | squid | 7:4.15-3.module+el8.6.0+16749+7b6feaf0.2 | RHSA-2022:6775 |
| RHEL 7 | squid +2 | 7:3.5.20-17.el7_9.8 | RHSA-2022:6815 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.4 EUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2022:6776 |
| RHEL 8.4 EUS | squid | 7:4.11-4.module+el8.4.0+16750+7556a224.4 | RHSA-2022:6776 |
| RHEL 8.2 EUS | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2022:6777 |
| RHEL 8.2 EUS | squid | 7:4.4-8.module+el8.2.0+16757+26d6b59c.5 | RHSA-2022:6777 |
| RHEL 8.1 E4S | libecap +1 | 1.0.1-2.module+el8.1.0+4044+36416a77 | RHSA-2022:6774 |
| RHEL 8.1 E4S | squid | 7:4.4-8.module+el8.1.0+16758+65e5269e.5 | RHSA-2022:6774 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | squid | 7:5.2-1.el9_0.2 | ALSA-2022:6839 |
| AlmaLinux 8 | libecap +1 | 1.0.1-2.module_el8.6.0+2741+01592ae8 | ALSA-2022:6775 |
| AlmaLinux 8 | squid | 7:4.15-3.module_el8.6.0+3275+7a670b72.2 | ALSA-2022:6775 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | squid | 7:5.2-1.el9_0.2 | RLSA-2022:6839 |
| Rocky Linux 8 | libecap | 1.0.1-2.module+el8.4.0+404+316a0dc5 | RLSA-2022:6775 |
| Rocky Linux 8 | squid | 7:4.15-3.module+el8.6.0+1044+67ab5d0a.2 | RLSA-2022:6775 |
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 v3.16 | squid | 5.2-r1 | — |
| Alpine v3.15 | squid | 5.2-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | squid +2 | 7:3.5.20-17.amzn2.7.1 | ALAS2-2023-1907 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | squid | 7:5.2-1.el9_0.2 | ELSA-2022-6839 |
| Oracle Linux 8 | libecap +1 | 1.0.1-2.module+el8.3.0+7819+eb7d4ef6 | ELSA-2022-6775 |
| Oracle Linux 8 | squid | 7:4.15-3.module+el8.6.0+20822+0be15e43.1 | ELSA-2022-6775 |
| Oracle Linux 7 | squid +2 | 7:3.5.20-17.0.1.el7_9.8 | ELSA-2022-6815 |
Advisories 24
- ALSA-2022:6839 Important: squid security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:6775 Important: squid:4 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2022:6815 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-6857-1 squid3 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- 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
- RLSA-2022:6775 Important: squid:4 security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2022:6839 Important: squid security update Rocky Linux Security Advisories · Feb 4, 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
- RHSA-2022:6839 Red Hat Security Advisory: squid security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:6776 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:6777 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:6775 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:6774 Red Hat Security Advisory: squid:4 security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- 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
- ALAS2-2023-1907 Important: squid security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 20, 2023
- ELSA-2022-6815 Important: squid security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 7, 2022
- ELSA-2022-6839 Important: squid security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 6, 2022
- ELSA-2022-6775 Important: squid:4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 5, 2022