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    CVE-2026-33526

    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.

    Published:Mar 26, 2026
    Last Modified:Mar 31, 2026
    EPS:Mar 26, 2026
    EPSS Score:0.01299
    CVSS Score:7.5

    Affected Products

    Vendor
    Squid-cache
    Product
    Squid

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-50012 (CVSS 5.5) — Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest re…
    CVE-2026-47729 (CVSS 6.5) — Squid is a caching proxy for the Web. Prior to 7.6, due to an improper validation of syntactic correctness of …
    CVE-2026-33515 (CVSS 6.9) — Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnera…
    CVE-2026-32748 (CVSS 8.7) — Squid is a caching proxy for the Web. Prior to version 7.5, due to premature release of resource during expect…
    CVE-2025-62168 (CVSS 10) — Squid is a caching proxy for the Web. In Squid versions prior to 7.2, a failure to redact HTTP authentication …
    CVE-2025-59362 (CVSS 4) — Squid through 7.1 mishandles ASN.1 encoding of long SNMP OIDs. This occurs in asn_build_objid in lib/snmplib/a…
    CVE-2025-54574 (CVSS 9.3) — Squid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow…
    CVE-2024-45802 (CVSS 7.5) — Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to Input Validati…
    CVE-2024-37894 (CVSS 6.3) — Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to an Out-of-bounds Write erro…
    CVE-2024-25111 (CVSS 8.6) — Squid is a web proxy cache. Starting in version 3.5.27 and prior to version 6.8, Squid may be vulnerable to a …

    References

    https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91
    https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg
    http://www.openwall.com/lists/oss-security/2026/03/25/2
    https://access.redhat.com/errata/RHSA-2026:10255
    https://access.redhat.com/errata/RHSA-2026:10256
    https://access.redhat.com/errata/RHSA-2026:10257
    https://access.redhat.com/errata/RHSA-2026:11901
    https://access.redhat.com/errata/RHSA-2026:20564
    https://access.redhat.com/errata/RHSA-2026:20565
    https://access.redhat.com/errata/RHSA-2026:20580
    https://access.redhat.com/errata/RHSA-2026:6301
    https://access.redhat.com/errata/RHSA-2026:8119
    https://access.redhat.com/errata/RHSA-2026:8317
    https://access.redhat.com/errata/RHSA-2026:8880
    https://access.redhat.com/errata/RHSA-2026:9220
    https://access.redhat.com/security/cve/CVE-2026-33526
    https://bugzilla.redhat.com/show_bug.cgi?id=2451574
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33526.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High