CVE-2025-61730 (GCVE-0-2025-61730)

Vulnerability from cvelistv5 – Published: 2026-01-28 19:30 – Updated: 2026-01-29 18:33
VLAI?
Title
Handshake messages may be processed at the incorrect encryption level in crypto/tls
Summary
During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake.
CWE
  • CWE-940 - Improper Verification of Source of a Communication Channel
Assigner
Go
Impacted products
Vendor Product Version
Go standard library crypto/tls Affected: 0 , < 1.24.12 (semver)
Affected: 1.25.0 , < 1.25.6 (semver)
Create a notification for this product.
Credits
Coia Prant (github.com/rbqvq)
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "NONE",
              "baseScore": 6.2,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-61730",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-29T18:32:49.184947Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-29T18:33:18.399Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "crypto/tls",
          "product": "crypto/tls",
          "programRoutines": [
            {
              "name": "Conn.handleKeyUpdate"
            },
            {
              "name": "Conn.handshakeContext"
            },
            {
              "name": "clientHandshakeStateTLS13.establishHandshakeKeys"
            },
            {
              "name": "clientHandshakeStateTLS13.readServerFinished"
            },
            {
              "name": "clientHandshakeStateTLS13.sendClientFinished"
            },
            {
              "name": "serverHandshakeStateTLS13.checkForResumption"
            },
            {
              "name": "serverHandshakeStateTLS13.doHelloRetryRequest"
            },
            {
              "name": "serverHandshakeStateTLS13.sendServerParameters"
            },
            {
              "name": "serverHandshakeStateTLS13.sendServerFinished"
            },
            {
              "name": "serverHandshakeStateTLS13.readClientFinished"
            },
            {
              "name": "Conn.quicSetReadSecret"
            },
            {
              "name": "Conn.Handshake"
            },
            {
              "name": "Conn.HandshakeContext"
            },
            {
              "name": "Conn.Read"
            },
            {
              "name": "Conn.Write"
            },
            {
              "name": "Dial"
            },
            {
              "name": "DialWithDialer"
            },
            {
              "name": "Dialer.Dial"
            },
            {
              "name": "Dialer.DialContext"
            },
            {
              "name": "QUICConn.HandleData"
            },
            {
              "name": "QUICConn.Start"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.24.12",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.25.6",
              "status": "affected",
              "version": "1.25.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Coia Prant (github.com/rbqvq)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-940: Improper Verification of Source of a Communication Channel",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-28T19:30:30.986Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/724120"
        },
        {
          "url": "https://go.dev/issue/76443"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-4340"
        }
      ],
      "title": "Handshake messages may be processed at the incorrect encryption level in crypto/tls"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2025-61730",
    "datePublished": "2026-01-28T19:30:30.986Z",
    "dateReserved": "2025-09-30T15:05:03.605Z",
    "dateUpdated": "2026-01-29T18:33:18.399Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-61730\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-01-28T20:16:09.940\",\"lastModified\":\"2026-01-29T19:16:16.533\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":6.2,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.5,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://go.dev/cl/724120\",\"source\":\"security@golang.org\"},{\"url\":\"https://go.dev/issue/76443\",\"source\":\"security@golang.org\"},{\"url\":\"https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc\",\"source\":\"security@golang.org\"},{\"url\":\"https://pkg.go.dev/vuln/GO-2026-4340\",\"source\":\"security@golang.org\"}]}}",
    "vulnrichment": {
      "containers": "{\"cna\": {\"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-01-28T19:30:30.986Z\"}, \"title\": \"Handshake messages may be processed at the incorrect encryption level in crypto/tls\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"During the TLS 1.3 handshake if multiple messages are sent in records that span encryption level boundaries (for instance the Client Hello and Encrypted Extensions messages), the subsequent messages may be processed before the encryption level changes. This can cause some minor information disclosure if a network-local attacker can inject messages during the handshake.\"}], \"affected\": [{\"vendor\": \"Go standard library\", \"product\": \"crypto/tls\", \"collectionURL\": \"https://pkg.go.dev\", \"packageName\": \"crypto/tls\", \"versions\": [{\"version\": \"0\", \"lessThan\": \"1.24.12\", \"status\": \"affected\", \"versionType\": \"semver\"}, {\"version\": \"1.25.0\", \"lessThan\": \"1.25.6\", \"status\": \"affected\", \"versionType\": \"semver\"}], \"programRoutines\": [{\"name\": \"Conn.handleKeyUpdate\"}, {\"name\": \"Conn.handshakeContext\"}, {\"name\": \"clientHandshakeStateTLS13.establishHandshakeKeys\"}, {\"name\": \"clientHandshakeStateTLS13.readServerFinished\"}, {\"name\": \"clientHandshakeStateTLS13.sendClientFinished\"}, {\"name\": \"serverHandshakeStateTLS13.checkForResumption\"}, {\"name\": \"serverHandshakeStateTLS13.doHelloRetryRequest\"}, {\"name\": \"serverHandshakeStateTLS13.sendServerParameters\"}, {\"name\": \"serverHandshakeStateTLS13.sendServerFinished\"}, {\"name\": \"serverHandshakeStateTLS13.readClientFinished\"}, {\"name\": \"Conn.quicSetReadSecret\"}, {\"name\": \"Conn.Handshake\"}, {\"name\": \"Conn.HandshakeContext\"}, {\"name\": \"Conn.Read\"}, {\"name\": \"Conn.Write\"}, {\"name\": \"Dial\"}, {\"name\": \"DialWithDialer\"}, {\"name\": \"Dialer.Dial\"}, {\"name\": \"Dialer.DialContext\"}, {\"name\": \"QUICConn.HandleData\"}, {\"name\": \"QUICConn.Start\"}], \"defaultStatus\": \"unaffected\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-940: Improper Verification of Source of a Communication Channel\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/724120\"}, {\"url\": \"https://go.dev/issue/76443\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-4340\"}], \"credits\": [{\"lang\": \"en\", \"value\": \"Coia Prant (github.com/rbqvq)\"}]}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.2, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-61730\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-29T18:32:49.184947Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-29T18:33:11.041Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-61730\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Go\", \"dateReserved\": \"2025-09-30T15:05:03.605Z\", \"datePublished\": \"2026-01-28T19:30:30.986Z\", \"dateUpdated\": \"2026-01-29T18:33:18.399Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…