Amazon Linux 2 Security Advisory: ALAS2-2026-3371
Advisory Released Date: 2026-06-22
Advisory Updated Date: 2026-06-22
Severity:
Important
Issue Overview:
Due to an Improper Input Validation bug, Squid is vulnerable to
a Heap-based Buffer Overflow attack against cache digests.
This problem allows a trusted server to perform a Heap-based
Buffer Overflow when sending maliciously crafted replies to
cache_digest request messages.
This attack is limited to Squid instances that have been
compiled with the --enable-cache-digests option. (CVE-2026-50012)
Affected Packages:
squid
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update squid or yum update --advisory ALAS2-2026-3371 to update your system.
New Packages:
aarch64:
squid-3.5.20-17.amzn2.7.27.aarch64
squid-sysvinit-3.5.20-17.amzn2.7.27.aarch64
squid-migration-script-3.5.20-17.amzn2.7.27.aarch64
squid-debuginfo-3.5.20-17.amzn2.7.27.aarch64
i686:
squid-3.5.20-17.amzn2.7.27.i686
squid-sysvinit-3.5.20-17.amzn2.7.27.i686
squid-migration-script-3.5.20-17.amzn2.7.27.i686
squid-debuginfo-3.5.20-17.amzn2.7.27.i686
src:
squid-3.5.20-17.amzn2.7.27.src
x86_64:
squid-3.5.20-17.amzn2.7.27.x86_64
squid-sysvinit-3.5.20-17.amzn2.7.27.x86_64
squid-migration-script-3.5.20-17.amzn2.7.27.x86_64
squid-debuginfo-3.5.20-17.amzn2.7.27.x86_64