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      "category" : "summary",
      "text" : "An update for the squid:4 module is now available for Red Hat Enterprise Linux 8.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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      "category" : "general",
      "text" : "Squid is a high-performance proxy caching server for web clients, supporting FTP, and HTTP data objects.\n\nSecurity Fix(es):\n\n* squid: Squid: Denial of Service via heap Use-After-Free vulnerability in ICP handling (CVE-2026-33526)\n\n* Squid: Squid: Denial of Service via crafted ICP traffic (CVE-2026-32748)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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      "text" : "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
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      "url" : "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_8317.json"
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    "cve" : "CVE-2026-32748",
    "cwe" : {
      "id" : "CWE-826",
      "name" : "Premature Release of Resource During Expected Lifetime"
    },
    "discovery_date" : "2026-03-26T01:01:29.920121+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2451577"
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    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in Squid. A remote attacker can exploit this vulnerability by sending specially crafted ICP (Internet Cache Protocol) traffic. This can lead to a Denial of Service (DoS) due to premature resource release and use-after-free vulnerabilities. This attack is possible in Squid deployments with explicitly enabled ICP support.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "Squid: Squid: Denial of Service via crafted ICP traffic",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "This Important flaw in Squid can lead to a Denial of Service when processing specially crafted Internet Cache Protocol (ICP) traffic. This vulnerability affects Red Hat products running Squid if ICP support is explicitly enabled by configuring a non-zero `icp_port`. Deployments where ICP is not enabled by default are not affected.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
    } ],
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      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-32748"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2451577",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2451577"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-32748",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-32748"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-32748",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-32748"
    }, {
      "category" : "external",
      "summary" : "http://www.openwall.com/lists/oss-security/2026/03/25/3",
      "url" : "http://www.openwall.com/lists/oss-security/2026/03/25/3"
    }, {
      "category" : "external",
      "summary" : "https://github.com/squid-cache/squid/commit/703e07d25ca6fa11f52d20bf0bb879e22ab7481b",
      "url" : "https://github.com/squid-cache/squid/commit/703e07d25ca6fa11f52d20bf0bb879e22ab7481b"
    }, {
      "category" : "external",
      "summary" : "https://github.com/squid-cache/squid/security/advisories/GHSA-f9p7-3jqg-hhvq",
      "url" : "https://github.com/squid-cache/squid/security/advisories/GHSA-f9p7-3jqg-hhvq"
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      "date" : "2026-04-15T14:42:07+00:00",
      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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        "category" : "none"
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      "url" : "https://access.redhat.com/errata/RHSA-2026:8317"
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      "category" : "workaround",
      "details" : "To mitigate this issue, ensure that ICP support is not explicitly enabled in the Squid configuration. This can be achieved by commenting out or setting `icp_port` to `0` in the `squid.conf` file. After modifying the configuration, the Squid service must be reloaded or restarted for the changes to take effect.\n\nExample:\n```\n# icp_port 3130\n```\nor\n```\nicp_port 0\n```\nWarning: Reloading or restarting the Squid service may temporarily interrupt proxy services.",
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    "scores" : [ {
      "cvss_v3" : {
        "attackComplexity" : "LOW",
        "attackVector" : "NETWORK",
        "availabilityImpact" : "HIGH",
        "baseScore" : 7.5,
        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "NONE",
        "integrityImpact" : "NONE",
        "privilegesRequired" : "NONE",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version" : "3.1"
      },
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    } ],
    "threats" : [ {
      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "Squid: Squid: Denial of Service via crafted ICP traffic"
  }, {
    "cve" : "CVE-2026-33526",
    "cwe" : {
      "id" : "CWE-825",
      "name" : "Expired Pointer Dereference"
    },
    "discovery_date" : "2026-03-26T01:01:16.233453+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2451574"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in Squid. A remote attacker can exploit a heap Use-After-Free vulnerability when handling ICP (Internet Cache Protocol) traffic. This allows them to perform a reliable and repeatable Denial of Service (DoS) attack, making the Squid service unavailable. This attack is limited to deployments where ICP support is explicitly enabled.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "squid: Squid: Denial of Service via heap Use-After-Free vulnerability in ICP handling",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Important: A heap Use-After-Free vulnerability in Squid's ICP handling can lead to a denial of service. This flaw affects Red Hat products where the Squid proxy is configured to explicitly enable Internet Cache Protocol (ICP) support by setting a non-zero `icp_port`. Deployments with default configurations, where ICP is typically disabled, are not affected.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
    } ],
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    },
    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-33526"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2451574",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2451574"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-33526",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-33526"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33526",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33526"
    }, {
      "category" : "external",
      "summary" : "http://www.openwall.com/lists/oss-security/2026/03/25/2",
      "url" : "http://www.openwall.com/lists/oss-security/2026/03/25/2"
    }, {
      "category" : "external",
      "summary" : "https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91",
      "url" : "https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91"
    }, {
      "category" : "external",
      "summary" : "https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg",
      "url" : "https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg"
    } ],
    "release_date" : "2026-03-26T00:16:12.195000+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-04-15T14:42:07+00:00",
      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "restart_required" : {
        "category" : "none"
      },
      "url" : "https://access.redhat.com/errata/RHSA-2026:8317"
    }, {
      "category" : "workaround",
      "details" : "To mitigate this issue, disable ICP support in Squid by ensuring that `icp_port` is set to `0` in the `squid.conf` configuration file. This will prevent Squid from processing ICP traffic and eliminate the attack vector. After modifying the configuration, the Squid service must be restarted for the changes to take effect.",
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        "attackComplexity" : "LOW",
        "attackVector" : "NETWORK",
        "availabilityImpact" : "HIGH",
        "baseScore" : 7.5,
        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "NONE",
        "integrityImpact" : "NONE",
        "privilegesRequired" : "NONE",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version" : "3.1"
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    "threats" : [ {
      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "squid: Squid: Denial of Service via heap Use-After-Free vulnerability in ICP handling"
  } ]
}