Track vulnerabilities like this one.
Sign up free to get alerted when software you use is affected.
7.7
OpenEuler Squid allows request smuggling
published 6 days ago
Summary
Versions of the Squid proxy included with OpenEuler from 3.3.0.1 up to 7.5 can be tricked into misreading certain HTTP headers, letting a trusted client slip additional hidden requests past security checks. This can let an attacker bypass firewalls or poison upstream web caches with malicious content. Upgrade Squid to version 7.6 or later to close the gap.
What to do
- Update openeuler squid to version 4.9-33.oe2203sp4.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| openEuler:22.03-LTS-SP4 | openeuler | squid |
< 4.9-33.oe2203sp4 Fix: upgrade to 4.9-33.oe2203sp4
|
Original advisory text
squid security update
Squid is a high-performance proxy caching server. It handles all requests in a single, non-blocking, I/O-driven process and keeps meta data and implements negative caching of failed requests.
Security Fix(es):
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.(CVE-2026-61642)
Security Fix(es):
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.(CVE-2026-61642)
References
- https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-61642 Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker partial control (estimated)
Timeline
Published29 Oct 2026
Updated29 Oct 2026
First seen29 Oct 2026
Sources
OESA-2026-4581 · OSV
Track software like this
Free during beta