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NULL Pointer Dereference Affecting squid package, versions <4.1-1

Severity

 Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
12.91% (96th percentile)

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  • Snyk IDSNYK-ECHOLATEST-SQUID-18291738
  • published24 Jul 2026
  • disclosed9 Feb 2018
Report a new vulnerability Found a mistake?

Introduced: 9 Feb 2018

CVE-2018-1000027  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Echo:latest squid to version 4.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream squid package and not the squid package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.