Upstream information
Description
Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.Upstream Security Advisories:
SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having important severity.
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 7.7 | 7.5 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N |
| Attack Vector | Network | Network |
| Attack Complexity | Low | High |
| Privileges Required | Low | None |
| User Interaction | None | None |
| Scope | Changed | Changed |
| Confidentiality Impact | None | Low |
| Integrity Impact | High | High |
| Availability Impact | None | None |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | SUSE |
|---|---|
| Base Score | 5.1 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Attack Requirements | Present |
| Privileges Required | Low |
| User Interaction | None |
| Vulnerable System Confidentiality Impact | None |
| Vulnerable System Integrity Impact | Low |
| Vulnerable System Availability Impact | None |
| Subsequent System Confidentiality Impact | Low |
| Subsequent System Integrity Impact | High |
| Subsequent System Availability Impact | None |
| CVSSv4 Version | 4.0 |
SUSE Security Advisories:
- GHSA-537g-4gfh-w7m6, published Sat Sep 12 07:02:38 CEST 2026
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | squid | Affected |
| SUSE Linux Enterprise Server 15 SP7 | squid | Affected |
| SUSE Linux Enterprise Server 16.0 | squid | Affected |
| SUSE Linux Enterprise Server 16.1 | squid | Affected |
| SUSE Linux Enterprise Server 16.2 | squid | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | squid | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | squid | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | squid | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.2 | squid | Not affected |
| openSUSE Leap 16.0 | squid | Affected |
| openSUSE Leap 16.1 | squid | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 12 SP5 | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | squid | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP4 | squid | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP5 | squid | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP6 | squid | Affected |
| SUSE Linux Enterprise Server 12 SP5 | squid | Affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | squid | Affected |
| SUSE Linux Enterprise Server 15 SP4 | squid | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | squid | Affected |
| SUSE Linux Enterprise Server 15 SP5 | squid | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | squid | Affected |
| SUSE Linux Enterprise Server 15 SP6 | squid | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | squid | Affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | squid | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | squid | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | squid | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | squid | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE CaaS Platform 4.0 | squid | Affected |
| SUSE Enterprise Storage 6 | squid | Affected |
| SUSE Enterprise Storage 7 | squid | Affected |
| SUSE Enterprise Storage 7.1 | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | squid | Affected |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | squid | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 | squid | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP1 | squid | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | squid | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP3 | squid | Affected |
| SUSE Linux Enterprise Real Time 15 SP2 | squid | Affected |
| SUSE Linux Enterprise Real Time 15 SP3 | squid | Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | squid | Affected |
| SUSE Linux Enterprise Server 15 | squid | Affected |
| SUSE Linux Enterprise Server 15 SP1 | squid | Affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | squid | Affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | squid | Affected |
| SUSE Linux Enterprise Server 15 SP2 | squid | Affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | squid | Affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | squid | Affected |
| SUSE Linux Enterprise Server 15 SP3 | squid | Affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | squid | Affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | squid | Affected |
| SUSE Linux Enterprise Server 15-LTSS | squid | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 | squid | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | squid | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | squid | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | squid | Affected |
| SUSE Manager Proxy 4.0 | squid | Affected |
| SUSE Manager Proxy 4.1 | squid | Affected |
| SUSE Manager Proxy 4.2 | squid | Affected |
| SUSE Manager Proxy 4.3 | squid | Affected |
| SUSE Manager Proxy LTS 4.3 | squid | Affected |
| SUSE Manager Retail Branch Server 4.0 | squid | Affected |
| SUSE Manager Retail Branch Server 4.1 | squid | Affected |
| SUSE Manager Retail Branch Server 4.2 | squid | Affected |
| SUSE Manager Retail Branch Server 4.3 | squid | Affected |
| SUSE Manager Retail Branch Server LTS 4.3 | squid | Affected |
| SUSE Manager Server 4.0 | squid | Affected |
| SUSE Manager Server 4.1 | squid | Affected |
| SUSE Manager Server 4.2 | squid | Affected |
| SUSE Manager Server 4.3 | squid | Affected |
| SUSE Manager Server LTS 4.3 | squid | Affected |
| openSUSE Leap 15.3 | squid | Affected |
| openSUSE Leap 15.4 | squid | Affected |
| openSUSE Leap 15.5 | squid | Affected |
| openSUSE Leap 15.6 | squid | Affected |
| Products at an unknown state of their lifecycle. | ||
| SUSE Linux Enterprise Server for NVIDIA 16.1 | squid | Affected |
| Container Status | ||
| suse/multi-linux-manager/5.1/x86_64/proxy-squid suse/multi-linux-manager/5.2/x86_64/proxy-squid | squid | Affected |
SUSE Timeline for this CVE
CVE page created: Sat Sep 12 12:37:27 2026CVE page last modified: Wed Oct 14 13:53:12 2026