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        "text": "An update for squid is now available for Red Hat Enterprise Linux 9.2 Extended Update Support.\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.",
        "title": "Topic"
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        "text": "Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.\n\nSecurity Fix(es):\n\n* squid: DoS against HTTP and HTTPS (CVE-2023-5824)\n\n* squid: Denial of Service in SSL Certificate validation (CVE-2023-46724)\n\n* squid: NULL pointer dereference in the gopher protocol code (CVE-2023-46728)\n\n* squid: Buffer over-read in the HTTP Message processing feature (CVE-2023-49285)\n\n* squid: Incorrect Check of Function Return Value In Helper Process management (CVE-2023-49286)\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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          "text": "A flaw was found in Squid. The limits applied for validation of HTTP response headers are applied before caching. However, Squid may grow a cached HTTP response header beyond the configured maximum size, causing a stall or crash of the worker process when a large header is retrieved from the disk cache, resulting in a denial of service.",
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          "text": "squid: DoS against HTTP and HTTPS",
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          "text": "This vulnerability only affects configurations with the `cache_dir` directive enabled. If this directive is not enabled, the Squid server is not vulnerable and no further mitigation is needed. For more information about the mitigation, see the mitigation section below.\n\nThe `cache_dir` directive is disabled by default in Squid shipped in Red Hat Enterprise Linux 6, 7, 8 and 9. Therefore, these Red Hat Enterprise Linux versions are not vulnerable with the default configuration.\n\nRed Hat is not planning to address this issue in Red Hat Enterprise Linux 6 and 7 due to the changes required and the magnitude of the differences between Squid 3 and 4 code bases, backporting the changes to the Squid 3 code base has not been feasible.\n\nWe recommend that customers using Squid as a caching proxy on Red Hat Enterprise Linux 6 and 7 to upgrade to Red Hat Enterprise Linux 8 and 9 to use Squid version 4 or version 5, respectively. Alternatively, see the mitigation section below for a way to workaround this vulnerability.",
          "title": "Statement"
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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        },
        {
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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        {
          "category": "external",
          "summary": "https://megamansec.github.io/Squid-Security-Audit/gopher-nullpointer.html",
          "url": "https://megamansec.github.io/Squid-Security-Audit/gopher-nullpointer.html"
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      "release_date": "2023-09-26T00:00:00+00:00",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
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      "cve": "CVE-2025-54574",
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        "id": "CWE-122",
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        {
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          "text": "A heap-based buffer overflow flaw was found in the Squid caching proxy. When processing the Uniform Resource Name (URNs), specific conditions can lead to remote code execution.",
          "title": "Vulnerability description"
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          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is Important because the heap-based buffer overflow occurs during URN processing in Squid\u2019s core request-handling path, which is exposed to untrusted, remote input. Unlike flaws that merely cause a service crash, this defect allows an attacker to manipulate heap memory structures, potentially achieving arbitrary code execution within the Squid process context. Since Squid often runs with elevated privileges and serves as a gateway between internal and external networks, successful exploitation could provide a remote attacker with direct control over the proxy server, enabling them to pivot into internal systems, intercept sensitive traffic, or alter cached content.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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        "title": "Topic"
      },
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        "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: DoS against HTTP and HTTPS (CVE-2023-5824)\n\n* squid: Denial of Service in SSL Certificate validation (CVE-2023-46724)\n\n* squid: NULL pointer dereference in the gopher protocol code (CVE-2023-46728)\n\n* squid: Buffer over-read in the HTTP Message processing feature (CVE-2023-49285)\n\n* squid: Incorrect Check of Function Return Value In Helper Process management (CVE-2023-49286)\n\n* squid: denial of service in HTTP request parsing (CVE-2023-50269)\n\nBug Fix(es):\n\n* squid crashes in assertion when a parent peer exists (JIRA:RHEL-18256)\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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        "name": "Improper Handling of Exceptional Conditions"
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      "discovery_date": "2023-10-24T00:00:00+00:00",
      "ids": [
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          "text": "2245914"
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          "category": "description",
          "text": "A flaw was found in Squid. The limits applied for validation of HTTP response headers are applied before caching. However, Squid may grow a cached HTTP response header beyond the configured maximum size, causing a stall or crash of the worker process when a large header is retrieved from the disk cache, resulting in a denial of service.",
          "title": "Vulnerability description"
        },
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          "text": "squid: DoS against HTTP and HTTPS",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability only affects configurations with the `cache_dir` directive enabled. If this directive is not enabled, the Squid server is not vulnerable and no further mitigation is needed. For more information about the mitigation, see the mitigation section below.\n\nThe `cache_dir` directive is disabled by default in Squid shipped in Red Hat Enterprise Linux 6, 7, 8 and 9. Therefore, these Red Hat Enterprise Linux versions are not vulnerable with the default configuration.\n\nRed Hat is not planning to address this issue in Red Hat Enterprise Linux 6 and 7 due to the changes required and the magnitude of the differences between Squid 3 and 4 code bases, backporting the changes to the Squid 3 code base has not been feasible.\n\nWe recommend that customers using Squid as a caching proxy on Red Hat Enterprise Linux 6 and 7 to upgrade to Red Hat Enterprise Linux 8 and 9 to use Squid version 4 or version 5, respectively. Alternatively, see the mitigation section below for a way to workaround this vulnerability.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s 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-2023-5824"
        },
        {
          "category": "external",
          "summary": "RHBZ#2245914",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2245914"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-5824",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-5824"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-5824",
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          "category": "external",
          "summary": "https://github.com/squid-cache/squid/security/advisories/GHSA-543m-w2m2-g255",
          "url": "https://github.com/squid-cache/squid/security/advisories/GHSA-543m-w2m2-g255"
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      "release_date": "2023-10-19T00:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2024-01-24T12:28:13+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\n\nAfter installing this update, the squid service will be restarted automatically.",
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            "integrityImpact": "NONE",
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          "category": "impact",
          "details": "Important"
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      "title": "squid: DoS against HTTP and HTTPS"
    },
    {
      "cve": "CVE-2023-46724",
      "cwe": {
        "id": "CWE-823",
        "name": "Use of Out-of-range Pointer Offset"
      },
      "discovery_date": "2023-11-02T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2247567"
        }
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        {
          "category": "description",
          "text": "A flaw was found in Squid. Due to an improper validation of the specified index bug, Squid compiled using `--with-openssl` is vulnerable to a denial of service attack against SSL Certificate validation. This flaw allows a remote server to perform a denial of service against the Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a server certificate chain. This attack is limited to HTTPS and SSL-Bump.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "squid: Denial of Service in SSL Certificate validation",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s 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-2023-46724"
        },
        {
          "category": "external",
          "summary": "RHBZ#2247567",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2247567"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-46724",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-46724"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-46724",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46724"
        },
        {
          "category": "external",
          "summary": "http://www.squid-cache.org/Versions/v5/SQUID-2023_4.patch",
          "url": "http://www.squid-cache.org/Versions/v5/SQUID-2023_4.patch"
        },
        {
          "category": "external",
          "summary": "http://www.squid-cache.org/Versions/v6/SQUID-2023_4.patch",
          "url": "http://www.squid-cache.org/Versions/v6/SQUID-2023_4.patch"
        },
        {
          "category": "external",
          "summary": "https://github.com/squid-cache/squid/commit/b70f864940225dfe69f9f653f948e787f99c3810",
          "url": "https://github.com/squid-cache/squid/commit/b70f864940225dfe69f9f653f948e787f99c3810"
        },
        {
          "category": "external",
          "summary": "https://github.com/squid-cache/squid/security/advisories/GHSA-73m6-jm96-c6r3",
          "url": "https://github.com/squid-cache/squid/security/advisories/GHSA-73m6-jm96-c6r3"
        }
      ],
      "release_date": "2023-11-01T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2024-01-24T12:28:13+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\n\nAfter installing this update, the squid service will be restarted automatically.",
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            "category": "none"
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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"
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      ],
      "title": "squid: Denial of Service in SSL Certificate validation"
    },
    {
      "cve": "CVE-2023-46728",
      "cwe": {
        "id": "CWE-476",
        "name": "NULL Pointer Dereference"
      },
      "discovery_date": "2023-11-07T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2248521"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service attack against Squid\u0027s Gopher gateway. The gopher protocol is always available and enabled in Squid. This issue may lead to a remote denial of service via gopher URL requests.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "squid: NULL pointer dereference in the gopher protocol code",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      ],
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2023-46728"
        },
        {
          "category": "external",
          "summary": "RHBZ#2248521",
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-46728",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46728"
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        {
          "category": "external",
          "summary": "https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f",
          "url": "https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f"
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        {
          "category": "external",
          "summary": "https://megamansec.github.io/Squid-Security-Audit/gopher-nullpointer.html",
          "url": "https://megamansec.github.io/Squid-Security-Audit/gopher-nullpointer.html"
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      "release_date": "2023-09-26T00:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2024-01-24T12:28:13+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\n\nAfter installing this update, the squid service will be restarted automatically.",
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            "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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      "cve": "CVE-2023-49285",
      "cwe": {
        "id": "CWE-126",
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "squid: Buffer over-read in the HTTP Message processing feature",
          "title": "Vulnerability summary"
        },
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          "category": "other",
          "text": "The only security impact of this vulnerability is a remote denial of service. For this reason, this flaw was rated with an important, and not critical, severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "date": "2024-01-24T12:28:13+00:00",
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      "cve": "CVE-2023-49286",
      "cwe": {
        "id": "CWE-617",
        "name": "Reachable Assertion"
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      "discovery_date": "2023-12-04T00:00:00+00:00",
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          "system_name": "Red Hat Bugzilla ID",
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        {
          "category": "description",
          "text": "A flaw was found in Squid due to an incorrect check of the return value in the helper process management. This issue may allow attackers to perform remote denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "squid: Incorrect Check of Function Return Value In Helper Process management",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The only security impact of this vulnerability is a remote denial of service. For this reason, this flaw was rated with an important, and not critical, severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s 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",
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          "category": "external",
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      "release_date": "2023-12-04T00:00:00+00:00",
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          "date": "2024-01-24T12:28:13+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\n\nAfter installing this update, the squid service will be restarted automatically.",
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            "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",
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "squid: Incorrect Check of Function Return Value In Helper Process management"
    },
    {
      "cve": "CVE-2023-50269",
      "cwe": {
        "id": "CWE-674",
        "name": "Uncontrolled Recursion"
      },
      "discovery_date": "2023-12-15T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2254663"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Squid, which is susceptible to a Denial of Service (DoS) due to an Uncontrolled Recursion bug, specifically targeting HTTP Request parsing. Exploiting this issue involves a remote client initiating a DoS attack by sending an oversized X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This issue poses a threat to the stability and availability of the Squid service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "squid: denial of service in HTTP request parsing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Squid configurations lacking the \"follow_x_forwarded_for\" setting are not susceptible to the vulnerability.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s 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-2023-50269"
        },
        {
          "category": "external",
          "summary": "RHBZ#2254663",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2254663"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-50269",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-50269"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-50269",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-50269"
        },
        {
          "category": "external",
          "summary": "http://www.squid-cache.org/Versions/v5/SQUID-2023_10.patch",
          "url": "http://www.squid-cache.org/Versions/v5/SQUID-2023_10.patch"
        },
        {
          "category": "external",
          "summary": "http://www.squid-cache.org/Versions/v6/SQUID-2023_10.patch",
          "url": "http://www.squid-cache.org/Versions/v6/SQUID-2023_10.patch"
        },
        {
          "category": "external",
          "summary": "https://github.com/squid-cache/squid/security/advisories/GHSA-wgq4-4cfg-c4x3",
          "url": "https://github.com/squid-cache/squid/security/advisories/GHSA-wgq4-4cfg-c4x3"
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      "release_date": "2023-12-14T00:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2024-01-24T12:28:13+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\n\nAfter installing this update, the squid service will be restarted automatically.",
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
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            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
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      "cve": "CVE-2025-54574",
      "cwe": {
        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
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          "text": "2386026"
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          "category": "description",
          "text": "A heap-based buffer overflow flaw was found in the Squid caching proxy. When processing the Uniform Resource Name (URNs), specific conditions can lead to remote code execution.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "squid-cache: Squid Buffer Overflow",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is Important because the heap-based buffer overflow occurs during URN processing in Squid\u2019s core request-handling path, which is exposed to untrusted, remote input. Unlike flaws that merely cause a service crash, this defect allows an attacker to manipulate heap memory structures, potentially achieving arbitrary code execution within the Squid process context. Since Squid often runs with elevated privileges and serves as a gateway between internal and external networks, successful exploitation could provide a remote attacker with direct control over the proxy server, enabling them to pivot into internal systems, intercept sensitive traffic, or alter cached content.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 8.9,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "squid-cache: Squid Buffer Overflow"
    }
  ]
}