Description
Squid through 7.1 mishandles ASN.1 encoding of long SNMP OIDs. This occurs in asn_build_objid in lib/snmplib/asn1.c.
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 | 7.2-1 | — |
| Debian 13 | squid | 6.13-2+deb13u1 | — |
| Debian 12 | squid | 5.7-2+deb12u5 | — |
| Debian 11 | squid | 4.13-10+deb11u6 | DLA-4369-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | squid | 6.13-1ubuntu4 | — |
| Ubuntu 24.04 LTS | squid | 6.13-0ubuntu0.24.04.2 | USN-7804-1 |
| Ubuntu 22.04 LTS | squid | 5.9-0ubuntu0.22.04.3 | USN-7804-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | squid | 4.10-1ubuntu1.13+esm2 | USN-7804-2 |
| Ubuntu Pro 18.04 LTS | squid3 | 3.5.27-1ubuntu1.14+esm5 | USN-7804-2 |
| Ubuntu Pro 16.04 LTS | squid3 | 3.5.12-1ubuntu7.16+esm6 | USN-7804-2 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | squid | 6.10-150600.3.9.1 | SUSE-SU-2025:03606-1 |
| SLES 15 SP6 | squid | 6.10-150600.3.9.1 | SUSE-SU-2025:03606-1 |
| SLES 15 SP5 | squid | 5.7-150400.3.35.1 | SUSE-SU-2025:03627-1 |
| SLES 15 SP4 | squid | 5.7-150400.3.35.1 | SUSE-SU-2025:03627-1 |
| SLES 15 SP3 | squid | 4.17-150000.5.55.1 | SUSE-SU-2025:03521-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | squid | 4.17-4.53.1 | SUSE-SU-2025:03607-1 |
| SLES for SAP 16.0 | squid | 6.12-160000.3.1 | SUSE-SU-2026:20078-1 |
| SLES for SAP 15 SP5 | squid | 5.7-150400.3.35.1 | SUSE-SU-2025:03627-1 |
| SLES for SAP 15 SP4 | squid | 5.7-150400.3.35.1 | SUSE-SU-2025:03627-1 |
| SLES for SAP 15 SP3 | squid | 4.17-150000.5.55.1 | SUSE-SU-2025:03521-1 |
| SLES 16.0 | squid | 6.12-160000.3.1 | SUSE-SU-2026:20078-1 |
| SLE HPC 15 SP5 | squid | 5.7-150400.3.35.1 | SUSE-SU-2025:03627-1 |
| SLE HPC 15 SP4 | squid | 5.7-150400.3.35.1 | SUSE-SU-2025:03627-1 |
| SLE HPC 15 SP3 | squid | 4.17-150000.5.55.1 | SUSE-SU-2025:03521-1 |
| SUSE Manager Server LTS 4.3 | squid | 5.7-150400.3.35.1 | SUSE-SU-2025:03627-1 |
| SUSE Manager Proxy LTS 4.3 | squid | 5.7-150400.3.35.1 | SUSE-SU-2025:03627-1 |
| SUSE Enterprise Storage 7.1 | squid | 4.17-150000.5.55.1 | SUSE-SU-2025:03521-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 7.6-1.1 | openSUSE-SU-2026:11069-1 |
| openSUSE Leap 16.0 | squid | 6.12-160000.3.1 | openSUSE-SU-2026:20027-1 |
| openSUSE Leap 15.6 | squid | 6.10-150600.3.9.1 | SUSE-SU-2025:03606-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | squid | 7.3-r0 | — |
| Alpine v3.23 | squid | 7.3-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | squid | 7:6.13-1.amzn2023.0.2 | ALAS2023-2025-1219 |
| Amazon Linux 2 | squid +2 | 7:3.5.20-17.amzn2.7.24 | ALAS2-2025-3027 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | squid | 6.13-3 | — |
| Azure Linux 2 (CBL-Mariner) | squid | No fix yet | — |
Advisories 13
- USN-7804-2 squid, squid3 vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- openSUSE-SU-2026:11069-1 squid-7.6-1.1 on GA media SUSE / openSUSE Security Updates · Jun 20, 2026
- openSUSE-SU-2026:20027-1 Security update for squid SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20078-1 Security update for squid SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:03606-1 Security update for squid SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:03607-1 Security update for squid SUSE / openSUSE Security Updates · Mar 23, 2026
- USN-7804-1 squid vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2025:03627-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:03521-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-2143 Squid: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jan 20, 2026
- DLA-4369-1 squid - security update Debian Security (DSA / DLA) · Nov 11, 2025
- ALAS2-2025-3027 Important: squid security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 14, 2025
- ALAS2023-2025-1219 Important: squid security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 14, 2025