Details
It was discovered that Squid incorrectly handled certain HTTP Transfer-
Encoding headers. An attacker could possibly use this issue to perform HTTP
request smuggling attacks, bypass security mechanisms, or poison web
caches. (CVE-2026-61642)
It was discovered that Squid incorrectly handled certain cache digest
replies, which could lead to a buffer overflow. A remote attacker could
possibly use this issue to cause Squid to crash, resulting in a denial of
service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and
Ubuntu 20.04 LTS. (CVE-2026-50012)
It was discovered that Squid incorrectly handled parsing certain FTP
directory listings. A remote attacker could possibly use this issue to
obtain sensitive information. This issue only affected Ubuntu 16.04 LTS,
Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (
It was discovered that Squid incorrectly handled certain HTTP Transfer-
Encoding headers. An attacker could possibly use this issue to perform HTTP
request smuggling attacks, bypass security mechanisms, or poison web
caches. (CVE-2026-61642)
It was discovered that Squid incorrectly handled certain cache digest
replies, which could lead to a buffer overflow. A remote attacker could
possibly use this issue to cause Squid to crash, resulting in a denial of
service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and
Ubuntu 20.04 LTS. (CVE-2026-50012)
It was discovered that Squid incorrectly handled parsing certain FTP
directory listings. A remote attacker could possibly use this issue to
obtain sensitive information. This issue only affected Ubuntu 16.04 LTS,
Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-47729)
It was discovered that Squid incorrectly handled certain ICP traffic. A
remote attacker could possibly use this issue to cause Squid to crash,
resulting in a denial of service. This issue only affected Ubuntu 16.04
LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-32748,
CVE-2026-33526)
It was discovered that Squid incorrectly handled certain ICP requests. A
remote attacker could possibly use this issue to obtain sensitive
information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,
and Ubuntu 20.04 LTS. (CVE-2026-33515)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 24.04 LTS noble | squid – 6.14-0ubuntu0.24.04.5 | ||
| squid-openssl – 6.14-0ubuntu0.24.04.5 | |||
| 22.04 LTS jammy | squid – 5.9-0ubuntu0.22.04.8 | ||
| squid-openssl – 5.9-0ubuntu0.22.04.8 | |||
| 20.04 LTS focal | squid – 4.10-1ubuntu1.13+esm3 | ||
| 18.04 LTS bionic | squid – 3.5.27-1ubuntu1.14+esm6 | ||
| 16.04 LTS xenial | squid – 3.5.12-1ubuntu7.16+esm7 | ||
Reduce your security exposure
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