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Squid: dos against http and https

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2023-5824
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 15:24 UTC · Revision 1

Source evidence

Squid: dos against http and https

core-osv · Original source

Published 3 Nov 2023, 07:56 UTC

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.

osv:CVE-2023-5824
Complete source record
{
  "id": "23e3530b6091701ca1870f3d5e8ea969af6d629836c1bacf5e8b17c285bd0fbf",
  "url": "https://osv.dev/vulnerability/CVE-2023-5824",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Squid: dos against http and https",
    "summary": "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.",
    "evidence": "osv:CVE-2023-5824",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-5824",
      "aliases": [
        "CVE-2023-5824",
        "GHSA-543m-w2m2-g255"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/squid-cache/squid",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1d8175b27fc1c347649d4f221ff2633e8d800429"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "6.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "SQUID_6_3",
            "SQUID_6_2",
            "SQUID_6_1",
            "SQUID_6_0_3",
            "SQUID_6_0_2",
            "SQUID_6_0_1",
            "6.0.0-20210527-master-snapshot",
            "5.0.6-20210527-snapshot",
            "4.15-20210527-snapshot",
            "6.0.0-20210525-master-snapshot",
            "5.0.6-20210525-snapshot",
            "4.15-20210525-snapshot",
            "6.0.0-20210524-master-snapshot",
            "6.0.0-20210523-master-snapshot",
            "6.0.0-20210522-master-snapshot",
            "5.0.6-20210524-snapshot",
            "5.0.6-20210523-snapshot",
            "5.0.6-20210522-snapshot",
            "4.15-20210524-snapshot",
            "4.15-20210523-snapshot",
            "4.15-20210522-snapshot",
            "M-staged-PR365",
            "M-staged-PR370",
            "M-staged-PR376",
            "M-staged-PR375",
            "M-staged-PR373",
            "M-staged-PR372",
            "M-staged-PR319",
            "M-staged-PR366",
            "M-staged-PR351",
            "M-staged-PR342",
            "M-staged-PR364",
            "M-staged-PR359",
            "M-staged-PR348",
            "M-staged-PR345",
            "M-staged-PR314",
            "M-staged-PR306",
            "M-staged-PR294",
            "M-staged-PR299",
            "M-staged-PR295",
            "M-staged-PR293",
            "M-staged-PR164",
            "M-staged-PR276",
            "M-staged-PR274",
            "SQUID_3_5_27",
            "M-staged-PR264",
            "M-staged-PR268",
            "M-staged-PR267",
            "M-staged-PR266",
            "M-staged-PR258",
            "M-staged-PR230",
            "M-staged-PR255",
            "M-staged-PR252",
            "M-staged-PR229",
            "M-staged-PR241",
            "M-staged-PR239",
            "M-staged-PR242",
            "M-staged-PR235",
            "M-staged-PR238",
            "M-staged-PR218",
            "M-staged-PR237",
            "M-staged-PR227",
            "M-staged-PR202",
            "M-staged-PR225",
            "M-staged-PR220",
            "M-staged-PR221",
            "M-staged-PR210",
            "M-staged-PR209",
            "M-staged-PR208",
            "M-staged-PR198",
            "M-staged-PR206",
            "M-staged-PR182",
            "M-staged-PR195",
            "M-staged-PR199",
            "M-staged-PR200",
            "M-staged-PR196",
            "M-staged-PR193",
            "M-staged-PR181",
            "M-staged-PR189",
            "M-staged-PR176",
            "M-staged-PR186",
            "M-staged-PR179",
            "M-staged-PR170",
            "M-staged-PR161",
            "SQUID_4_0_16",
            "SQUID_4_0_15",
            "SQUID_4_0_14",
            "SQUID_4_0_13",
            "SQUID_4_0_12",
            "SQUID_4_0_11",
            "SQUID_4_0_10",
            "SQUID_4_0_9",
            "SQUID_4_0_8",
            "SQUID_4_0_7",
            "SQUID_4_0_6",
            "SQUID_4_0_5",
            "SQUID_4_0_4",
            "SQUID_4_0_3",
            "SQUID_4_0_2",
            "SQUID_4_0_1",
            "take00",
            "SQUID_3_0_RC1",
            "SQUID_3_0_PRE7",
            "SQUID_3_0_PRE6",
            "SQUID_3_0_PRE5",
            "SQUID_3_0_PRE4",
            "SQUID_3_0_PRE3",
            "SQUID_3_0_PRE2",
            "SQUID_3_0_PRE1",
            "HISTORIC_RELEASES"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-5824.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.746826504Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/downloads/content/package-browser/",
        "https://lists.debian.org/debian-lts-announce/2025/09/msg00027.html",
        "https://access.redhat.com/errata/RHSA-2023:7465",
        "https://access.redhat.com/errata/RHSA-2023:7668",
        "https://access.redhat.com/errata/RHSA-2024:0072",
        "https://access.redhat.com/errata/RHSA-2024:0397",
        "https://access.redhat.com/errata/RHSA-2024:0771",
        "https://access.redhat.com/errata/RHSA-2024:0772",
        "https://access.redhat.com/errata/RHSA-2024:0773",
        "https://access.redhat.com/errata/RHSA-2024:1153",
        "https://access.redhat.com/security/cve/CVE-2023-5824",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/5xxx/CVE-2023-5824.json",
        "https://github.com/squid-cache/squid/security/advisories/GHSA-543m-w2m2-g255",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-5824",
        "https://security.netapp.com/advisory/ntap-20231130-0003/",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2245914"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-755"
        ],
        "cna_assigner": "redhat",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "8090020231130092412.a75119d5"
                  },
                  {
                    "fixed": "8020020240122164331.4cda2c84"
                  },
                  {
                    "fixed": "8020020240122164331.4cda2c84"
                  },
                  {
                    "fixed": "8020020240122164331.4cda2c84"
                  },
                  {
                    "fixed": "8040020240122165847.522a0ee4"
                  },
                  {
                    "fixed": "8040020240122165847.522a0ee4"
                  },
                  {
                    "fixed": "8040020240122165847.522a0ee4"
                  },
                  {
                    "fixed": "8060020231222131040.ad008a3a"
                  },
                  {
                    "fixed": "8080020231222130009.63b34585"
                  },
                  {
                    "fixed": "7:5.5-6.el9_3.2"
                  },
                  {
                    "fixed": "7:5.2-1.el9_0.4"
                  },
                  {
                    "fixed": "7:5.5-5.el9_2.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "InverseAffectedRanges"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/5xxx/CVE-2023-5824.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-5824",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496794,
  "published_at": "2023-11-03T07:56:36.369+00:00"
}