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9.2 Critical

CVE-2026-33526 Squid is a caching proxy for the Web

Description

Squid is a caching proxy for the Web. Prior to version 7.5, due to heap Use-After-Free, Squid is vulnerable to Denial of Service when handling ICP traffic. This problem allows a remote attacker to perform a reliable and repeatable Denial of Service attack against the Squid service using ICP protocol. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero `icp_port`). This problem _cannot_ be mitigated by denying ICP queries using `icp_access` rules. Version 7.5 contains a patch.

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux Server (v. 7 ELS) Versions not published
Red Hat Enterprise Linux AppStream EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux AppStream (v. 10) Versions not published
Red Hat Enterprise Linux AppStream (v. 8) Versions not published
Red Hat Enterprise Linux AppStream AUS (v.8.4) Versions not published
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) Versions not published
Red Hat Enterprise Linux AppStream AUS (v.8.6) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.8.6) Versions not published
Red Hat Enterprise Linux AppStream TUS (v.8.6) Versions not published
Show the 26 other branches
Product Affected versions Fixed in
Red Hat Enterprise Linux AppStream E4S (v.8.8) Versions not published
Red Hat Enterprise Linux AppStream TUS (v.8.8) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.9.0) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.9.2) Versions not published
Red Hat Enterprise Linux AppStream EUS (v.9.4) Versions not published
Red Hat Enterprise Linux AppStream EUS (v.9.6) Versions not published
Red Hat Enterprise Linux AppStream (v. 9) Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux Server Optional (v. 7 ELS) Versions not published
squid 7.5 earliest → < 7.5 7.5
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 10.0 Extended Update Support Versions not published
Red Hat Enterprise Linux 7 Extended Lifecycle Support Versions not published
Red Hat Enterprise Linux 8 8100020260408092701.489197 earliest → < 8100020260408092701.489197e6 8100020260408092701.489197e6
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020260514123440.522 earliest → < 8040020260514123440.522a0ee4 8040020260514123440.522a0ee4
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020260514123440.522 earliest → < 8040020260514123440.522a0ee4 8040020260514123440.522a0ee4
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020260518090356 earliest → < 8060020260518090356.ad008a3a 8060020260518090356.ad008a3a
Red Hat Enterprise Linux 8.6 Telecommunications Update Service 8060020260518090356 earliest → < 8060020260518090356.ad008a3a 8060020260518090356.ad008a3a
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 8060020260518090356 earliest → < 8060020260518090356.ad008a3a 8060020260518090356.ad008a3a
Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020260514105733.63 earliest → < 8080020260514105733.63b34585 8080020260514105733.63b34585
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020260514105733.63 earliest → < 8080020260514105733.63b34585 8080020260514105733.63b34585
Red Hat Enterprise Linux 9 Versions not published
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 9.4 Extended Update Support Versions not published
Red Hat Enterprise Linux 9.6 Extended Update Support Versions not published

References

Timeline

  1. Published
  2. Last modified

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