CVE-2025-58186 (GCVE-0-2025-58186)
Vulnerability from cvelistv5
Published
2025-10-29 22:10
Modified
2025-10-30 14:24
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
Summary
Despite HTTP headers having a default limit of 1MB, the number of cookies that can be parsed does not have a limit. By sending a lot of very small cookies such as "a=;", an attacker can make an HTTP server allocate a large amount of structs, causing large memory consumption.
References
Impacted products
Vendor Product Version
Go standard library net/http Version: 0   ≤
Version: 1.25.0   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "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:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-58186",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-30T14:24:44.763207Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-30T14:24:50.235Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "net/http",
          "product": "net/http",
          "programRoutines": [
            {
              "name": "ParseCookie"
            },
            {
              "name": "readSetCookies"
            },
            {
              "name": "readCookies"
            },
            {
              "name": "Client.Do"
            },
            {
              "name": "Client.Get"
            },
            {
              "name": "Client.Head"
            },
            {
              "name": "Client.Post"
            },
            {
              "name": "Client.PostForm"
            },
            {
              "name": "Get"
            },
            {
              "name": "Head"
            },
            {
              "name": "Post"
            },
            {
              "name": "PostForm"
            },
            {
              "name": "Request.Cookie"
            },
            {
              "name": "Request.Cookies"
            },
            {
              "name": "Request.CookiesNamed"
            },
            {
              "name": "Response.Cookies"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.24.8",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.25.2",
              "status": "affected",
              "version": "1.25.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "jub0bs"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Despite HTTP headers having a default limit of 1MB, the number of cookies that can be parsed does not have a limit. By sending a lot of very small cookies such as \"a=;\", an attacker can make an HTTP server allocate a large amount of structs, causing large memory consumption."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-29T22:10:13.912Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/75672"
        },
        {
          "url": "https://go.dev/cl/709855"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2025-4012"
        }
      ],
      "title": "Lack of limit when parsing cookies can cause memory exhaustion in net/http"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2025-58186",
    "datePublished": "2025-10-29T22:10:13.912Z",
    "dateReserved": "2025-08-27T14:50:58.691Z",
    "dateUpdated": "2025-10-30T14:24:50.235Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-58186\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2025-10-29T23:16:19.547\",\"lastModified\":\"2025-10-30T15:15:40.070\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Despite HTTP headers having a default limit of 1MB, the number of cookies that can be parsed does not have a limit. By sending a lot of very small cookies such as \\\"a=;\\\", an attacker can make an HTTP server allocate a large amount of structs, causing large memory consumption.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}]},\"references\":[{\"url\":\"https://go.dev/cl/709855\",\"source\":\"security@golang.org\"},{\"url\":\"https://go.dev/issue/75672\",\"source\":\"security@golang.org\"},{\"url\":\"https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI\",\"source\":\"security@golang.org\"},{\"url\":\"https://pkg.go.dev/vuln/GO-2025-4012\",\"source\":\"security@golang.org\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-58186\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-30T14:24:44.763207Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-30T14:24:38.946Z\"}}], \"cna\": {\"title\": \"Lack of limit when parsing cookies can cause memory exhaustion in net/http\", \"credits\": [{\"lang\": \"en\", \"value\": \"jub0bs\"}], \"affected\": [{\"vendor\": \"Go standard library\", \"product\": \"net/http\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.24.8\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.25.0\", \"lessThan\": \"1.25.2\", \"versionType\": \"semver\"}], \"packageName\": \"net/http\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"ParseCookie\"}, {\"name\": \"readSetCookies\"}, {\"name\": \"readCookies\"}, {\"name\": \"Client.Do\"}, {\"name\": \"Client.Get\"}, {\"name\": \"Client.Head\"}, {\"name\": \"Client.Post\"}, {\"name\": \"Client.PostForm\"}, {\"name\": \"Get\"}, {\"name\": \"Head\"}, {\"name\": \"Post\"}, {\"name\": \"PostForm\"}, {\"name\": \"Request.Cookie\"}, {\"name\": \"Request.Cookies\"}, {\"name\": \"Request.CookiesNamed\"}, {\"name\": \"Response.Cookies\"}]}], \"references\": [{\"url\": \"https://go.dev/issue/75672\"}, {\"url\": \"https://go.dev/cl/709855\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2025-4012\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Despite HTTP headers having a default limit of 1MB, the number of cookies that can be parsed does not have a limit. By sending a lot of very small cookies such as \\\"a=;\\\", an attacker can make an HTTP server allocate a large amount of structs, causing large memory consumption.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-400: Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2025-10-29T22:10:13.912Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-58186\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-30T14:24:50.235Z\", \"dateReserved\": \"2025-08-27T14:50:58.691Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2025-10-29T22:10:13.912Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.