{
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        "metrics": [
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            "other": {
              "content": {
                "id": "CVE-2026-54891",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-07-02T17:24:44.468465Z",
                "version": "2.0.3"
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          "dateUpdated": "2026-07-02T17:24:50.025Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
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          "defaultStatus": "unaffected",
          "modules": [
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          "packageName": "otp",
          "packageURL": "pkg:software-id/erlang.org/otp",
          "product": "OTP",
          "programFiles": [
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              "status": "unknown",
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          "packageName": "ssl",
          "packageURL": "pkg:otp/ssl?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp\u0026vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
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          "packageURL": "pkg:github/erlang/otp",
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              "status": "affected",
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          "nodes": [
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                  "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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          "operator": "AND"
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Lukas Backstr\u00f6m"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Ingela Anderton Andin"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Dan Gudmundsson"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Jakub Witczak"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
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              "value": "\u003cp\u003eImproper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability in Erlang/OTP ssl (tls_gen_connection module) allows a network-positioned attacker to inject unauthenticated plaintext that the TLS client application later treats as authenticated server data.\u003c/p\u003e\n\u003cp\u003eThe function \u003ccode\u003etls_gen_connection:handle_protocol_record/3\u003c/code\u003e rejects \u003ccode\u003eAPPLICATION_DATA\u003c/code\u003e records that arrive in pre-handshake states when the TLS endpoint acts as a server, but does not apply the same check when the endpoint acts as a client. A network-positioned attacker can send plaintext \u003ccode\u003eAPPLICATION_DATA\u003c/code\u003e records to the client during the handshake. The records are buffered and, once the handshake completes successfully, delivered to the application as if they were authenticated post-handshake data. The attacker cannot observe the client\u0027s response or steer the connection, so the impact is limited to blind injection of unauthenticated bytes. The injection window is wider for TLS versions prior to TLS 1.3 than for TLS 1.3.\u003c/p\u003e\n\u003cp\u003eThis vulnerability is associated with program file \u003ccode\u003elib/ssl/src/tls_gen_connection.erl\u003c/code\u003e.\u003c/p\u003e\n\u003cp\u003eTLS 1.3 is affected starting with OTP\u0026nbsp;22.0, when TLS 1.3 support was added.\u003c/p\u003e\n\u003cp\u003eThis issue affects OTP from OTP\u0026nbsp;17.0 before OTP\u0026nbsp;27.3.4.14, from OTP\u0026nbsp;28.0 before OTP\u0026nbsp;28.5.0.3, and from OTP\u0026nbsp;29.0 before OTP\u0026nbsp;29.0.3, corresponding to ssl from 5.3.4 before 11.2.12.10, from 11.3 before 11.6.0.3, and from 11.7 before 11.7.3. Whether OTP before OTP\u0026nbsp;17.0, corresponding to ssl before 5.3.4, is affected is unknown.\u003c/p\u003e"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability in Erlang/OTP ssl (tls_gen_connection module) allows a network-positioned attacker to inject unauthenticated plaintext that the TLS client application later treats as authenticated server data.\n\nThe function `tls_gen_connection:handle_protocol_record/3` rejects `APPLICATION_DATA` records that arrive in pre-handshake states when the TLS endpoint acts as a server, but does not apply the same check when the endpoint acts as a client. A network-positioned attacker can send plaintext `APPLICATION_DATA` records to the client during the handshake. The records are buffered and, once the handshake completes successfully, delivered to the application as if they were authenticated post-handshake data. The attacker cannot observe the client\u0027s response or steer the connection, so the impact is limited to blind injection of unauthenticated bytes. The injection window is wider for TLS versions prior to TLS 1.3 than for TLS 1.3.\n\nThis vulnerability is associated with program file `lib/ssl/src/tls_gen_connection.erl`.\n\nTLS 1.3 is affected starting with OTP\u0026nbsp;22.0, when TLS 1.3 support was added.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.14, from OTP\u00a028.0 before OTP\u00a028.5.0.3, and from OTP\u00a029.0 before OTP\u00a029.0.3, corresponding to ssl from 5.3.4 before 11.2.12.10, from 11.3 before 11.6.0.3, and from 11.7 before 11.7.3. Whether OTP before OTP\u00a017.0, corresponding to ssl before 5.3.4, is affected is unknown."
            }
          ],
          "value": "Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability in Erlang/OTP ssl (tls_gen_connection module) allows a network-positioned attacker to inject unauthenticated plaintext that the TLS client application later treats as authenticated server data.\n\nThe function tls_gen_connection:handle_protocol_record/3 rejects APPLICATION_DATA records that arrive in pre-handshake states when the TLS endpoint acts as a server, but does not apply the same check when the endpoint acts as a client. A network-positioned attacker can send plaintext APPLICATION_DATA records to the client during the handshake. The records are buffered and, once the handshake completes successfully, delivered to the application as if they were authenticated post-handshake data. The attacker cannot observe the client\u0027s response or steer the connection, so the impact is limited to blind injection of unauthenticated bytes. The injection window is wider for TLS versions prior to TLS 1.3 than for TLS 1.3.\n\nThis vulnerability is associated with program file lib/ssl/src/tls_gen_connection.erl.\n\nTLS 1.3 is affected starting with OTP\u00a022.0, when TLS 1.3 support was added.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.14, from OTP\u00a028.0 before OTP\u00a028.5.0.3, and from OTP\u00a029.0 before OTP\u00a029.0.3, corresponding to ssl from 5.3.4 before 11.2.12.10, from 11.3 before 11.6.0.3, and from 11.7 before 11.7.3. Whether OTP before OTP\u00a017.0, corresponding to ssl before 5.3.4, is affected is unknown."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-94",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-94 Adversary in the Middle (AiTM)"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-924",
              "description": "CWE-924 Improper Enforcement of Message Integrity During Transmission in a Communication Channel",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-08T01:06:03.832Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "related"
          ],
          "url": "https://github.com/erlang/otp/security/advisories/GHSA-gf6r-99xw-6qg6"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-54891.html"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-54891"
        },
        {
          "tags": [
            "x_version-scheme"
          ],
          "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/erlang/otp/commit/07d2d0e93f6aaf7652a81e8df075fc1728da5e96"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "Plaintext APPLICATION_DATA injected during TLS handshake delivered to client application post-handshake in ssl"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-54891",
    "datePublished": "2026-07-02T16:06:30.982Z",
    "dateReserved": "2026-06-16T10:47:13.915Z",
    "dateUpdated": "2026-09-08T01:06:03.832Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}