FKIE_CVE-2025-58186

Vulnerability from fkie_nvd - Published: 2025-10-29 23:16 - Updated: 2026-10-11 20:10
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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
security@golang.orghttps://go.dev/cl/709855
security@golang.orghttps://go.dev/issue/75672
security@golang.orghttps://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI
security@golang.orghttps://pkg.go.dev/vuln/GO-2025-4012
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/10/08/1
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "security@golang.org"
    }
  ],
  "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."
    },
    {
      "lang": "es",
      "value": "A pesar de que los encabezados HTTP tienen un l\u00edmite predeterminado de 1MB, el n\u00famero de cookies que se pueden analizar no tiene un l\u00edmite. Al enviar una gran cantidad de cookies muy peque\u00f1as, como \u0027a=;\u0027, un atacante puede hacer que un servidor HTTP asigne una gran cantidad de estructuras, lo que provoca un gran consumo de memoria."
    }
  ],
  "id": "CVE-2025-58186",
  "lastModified": "2026-10-11T20:10:00.200",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-58186",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-10-30T14:24:44.763207Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-10-29T23:16:19.547",
  "references": [
    {
      "source": "security@golang.org",
      "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": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2025/10/08/1"
    }
  ],
  "sourceIdentifier": "security@golang.org",
  "vulnStatus": "Deferred"
}



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