Description
Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP(S) error page generation for certificate errors.
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 | 4.4-1 | — |
| Debian 13 | squid | 4.4-1 | — |
| Debian 12 | squid | 4.4-1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | squid | 4.4-5.3.2 | SUSE-SU-2018:3786-1 |
| SLES 12 SP4 | squid | 3.5.21-26.12.1 | SUSE-SU-2018:3771-2 |
| SLES 12 SP3 | squid | 3.5.21-26.12.1 | SUSE-SU-2018:3771-1 |
| SLES 11 SP4 | squid3 | 3.1.23-8.16.37.9.1 | SUSE-SU-2018:3790-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP4 | squid | 3.5.21-26.12.1 | SUSE-SU-2018:3771-2 |
| SLES for SAP 12 SP3 | squid | 3.5.21-26.12.1 | SUSE-SU-2018:3771-1 |
| SLES for SAP 11 SP4 | squid3 | 3.1.23-8.16.37.9.1 | SUSE-SU-2018:3790-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 4.16-1.5 | openSUSE-SU-2024:11403-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | squid +2 | 7:3.5.20-17.amzn2.7.8 | ALAS2-2023-2310 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
JonathanWilbur/CVE-2018-19131 ★ 18 · Nov 13, 2018
Proof-of-Concept exploit of CVE-2018-19131: Squid Proxy XSS via X.509 Certificate
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 7
- SUSE-SU-2018:3771-2 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3771-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11403-1 squid-4.16-1.5 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3786-1 Security update for squid SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3790-1 Security update for squid3 SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2023-2310 Moderate: squid security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 19, 2023
- WID-SEC-2023-2717 Squid: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 19, 2023