FKIE_CVE-2025-68121

Vulnerability from fkie_nvd - Published: 2026-02-05 18:16 - Updated: 2026-02-20 17:25
Severity ?
10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between the initial handshake and the resumed handshake, the resumed handshake may succeed when it should have failed. This may happen when a user calls Config.Clone and mutates the returned Config, or uses Config.GetConfigForClient. This can cause a client to resume a session with a server that it would not have resumed with during the initial handshake, or cause a server to resume a session with a client that it would not have resumed with during the initial handshake.
References
security@golang.orghttps://go.dev/cl/737700Patch
security@golang.orghttps://go.dev/issue/77217Exploit, Issue Tracking
security@golang.orghttps://groups.google.com/g/golang-announce/c/K09ubi9FQFkMailing List, Third Party Advisory
security@golang.orghttps://pkg.go.dev/vuln/GO-2026-4337Vendor Advisory
Impacted products
Vendor Product Version
golang go *
golang go *
golang go 1.26.0
golang go 1.26.0
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "9FEE539A-EDC2-4044-A38C-5A0FDF567509",
              "versionEndExcluding": "1.24.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B275853C-E253-485B-B469-31D1A7383965",
              "versionEndExcluding": "1.25.7",
              "versionStartIncluding": "1.25.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:golang:go:1.26.0:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "E529A0EC-B944-4E2F-B26A-2A9F31AFF240",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:golang:go:1.26.0:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "553D6D90-140E-4A54-86A3-00E66AC30F3C",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between the initial handshake and the resumed handshake, the resumed handshake may succeed when it should have failed. This may happen when a user calls Config.Clone and mutates the returned Config, or uses Config.GetConfigForClient. This can cause a client to resume a session with a server that it would not have resumed with during the initial handshake, or cause a server to resume a session with a client that it would not have resumed with during the initial handshake."
    },
    {
      "lang": "es",
      "value": "Durante la reanudaci\u00f3n de la sesi\u00f3n en crypto/tls, si la Config subyacente tiene sus campos ClientCAs o RootCAs mutados entre el handshake inicial y el handshake reanudado, el handshake reanudado puede tener \u00e9xito cuando deber\u00eda haber fallado. Esto puede ocurrir cuando un usuario llama a Config.Clone y muta la Config devuelta, o usa Config.GetConfigForClient. Esto puede hacer que un cliente reanude una sesi\u00f3n con un servidor con el que no la habr\u00eda reanudado durante el handshake inicial, o hacer que un servidor reanude una sesi\u00f3n con un cliente con el que no la habr\u00eda reanudado durante el handshake inicial."
    }
  ],
  "id": "CVE-2025-68121",
  "lastModified": "2026-02-20T17:25:50.303",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 10.0,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 6.0,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.2,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-02-05T18:16:10.857",
  "references": [
    {
      "source": "security@golang.org",
      "tags": [
        "Patch"
      ],
      "url": "https://go.dev/cl/737700"
    },
    {
      "source": "security@golang.org",
      "tags": [
        "Exploit",
        "Issue Tracking"
      ],
      "url": "https://go.dev/issue/77217"
    },
    {
      "source": "security@golang.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://groups.google.com/g/golang-announce/c/K09ubi9FQFk"
    },
    {
      "source": "security@golang.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://pkg.go.dev/vuln/GO-2026-4337"
    }
  ],
  "sourceIdentifier": "security@golang.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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