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Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder

Type: advisorySource: Official CVE List1 source record

Inefficient algorithmic complexity in the Erlang/OTP asn1 OBJECT IDENTIFIER decoder allows a remote unauthenticated attacker to cause denial of service by sending a crafted OID during the TLS handshake. The BER OID decoder asn1rtt_ber:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_ber.erl and the equivalent PER helper asn1rtt_per_common:dec_subidentifiers/3 in lib/asn1/src/asn1rtt_per_common.erl accumulate a base-128 subidentifier into an unbounded integer using (Av bsl 7) + H per continuation byte. Each shift and addition on the growing accumulator is linear in the number of bits already accumulated, giving quadratic total work in the size of a single subidentifier. The JER helper asn1rtt_jer:json2oid/1 in lib/asn1/src/asn1rtt_jer.erl exhibits the same class of unbounded-integer parsing when decoding a dot-separated OID from JSON. A DER-encoded OBJECT IDENTIFIER with one very large arc (approximately 262 KB of continuation bytes) consumes roughly 13 seconds of CPU on typical hardware. The vulnerable decoder is generated into every ASN.1 module that contains an OBJECT IDENTIFIER, including OTP-PUB-KEY which is reached during X.509 certificate parsing via public_key:pkix_decode_cert/2. This decoder runs before any signature or trust chain verification, so any Erlang service that parses peer TLS certificates is exposed: the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates). This vulnerability is associ

Announced Source revision 1
Original source ↗

CVE-2026-65634

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-65634

OTP

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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OTP

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

OTP

Source reference: /containers/cna/affected/2/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "cpes": [
      "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
    ],
    "vendor": "Erlang",
    "modules": [
      "asn1rtt_ber",
      "asn1rtt_per_common",
      "asn1rtt_jer"
    ],
    "product": "OTP",
    "versions": [
      {
        "status": "affected",
        "changes": [
          {
            "at": "27.3.4.18",
            "status": "unaffected"
          },
          {
            "at": "28.5.0.7",
            "status": "unaffected"
          },
          {
            "at": "29.1.1",
            "status": "unaffected"
          }
        ],
        "version": "17.0",
        "lessThan": "*",
        "versionType": "otp"
      }
    ],
    "packageURL": "pkg:software-id/erlang.org/otp",
    "packageName": "otp",
    "programFiles": [
      "lib/asn1/src/asn1rtt_ber.erl",
      "lib/asn1/src/asn1rtt_per_common.erl",
      "lib/asn1/src/asn1rtt_jer.erl"
    ],
    "defaultStatus": "unknown",
    "programRoutines": [
      {
        "name": "asn1rtt_ber:dec_subidentifiers/3"
      },
      {
        "name": "asn1rtt_per_common:dec_subidentifiers/3"
      },
      {
        "name": "asn1rtt_jer:json2oid/1"
      }
    ]
  },
  {
    "cpes": [
      "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
    ],
    "repo": "https://github.com/erlang/otp",
    "vendor": "Erlang",
    "modules": [
      "asn1rtt_ber",
      "asn1rtt_per_common",
      "asn1rtt_jer"
    ],
    "product": "OTP",
    "versions": [
      {
        "status": "affected",
        "changes": [
          {
            "at": "5.3.4.3",
            "status": "unaffected"
          },
          {
            "at": "5.4.3.1",
            "status": "unaffected"
          },
          {
            "at": "5.5.2",
            "status": "unaffected"
          }
        ],
        "version": "3.0",
        "lessThan": "*",
        "versionType": "otp"
      }
    ],
    "packageURL": "pkg:otp/asn1",
    "packageName": "asn1",
    "programFiles": [
      "src/asn1rtt_ber.erl",
      "src/asn1rtt_per_common.erl",
      "src/asn1rtt_jer.erl"
    ],
    "defaultStatus": "unknown",
    "programRoutines": [
      {
        "name": "asn1rtt_ber:dec_subidentifiers/3"
      },
      {
        "name": "asn1rtt_per_common:dec_subidentifiers/3"
      },
      {
        "name": "asn1rtt_jer:json2oid/1"
      }
    ]
  },
  {
    "cpes": [
      "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
    ],
    "repo": "https://github.com/erlang/otp",
    "vendor": "Erlang",
    "modules": [
      "asn1rtt_ber",
      "asn1rtt_per_common",
      "asn1rtt_jer"
    ],
    "product": "OTP",
    "versions": [
      {
        "status": "affected",
        "version": "84adefa331c4159d432d22840663c38f155cd4c1",
        "lessThan": "0fe2c02fdc06fab1c63be9db1a7456993d20f838",
        "versionType": "git"
      },
      {
        "status": "unaffected",
        "version": "0fe2c02fdc06fab1c63be9db1a7456993d20f838",
        "lessThan": "*",
        "versionType": "git"
      }
    ],
    "packageURL": "pkg:github/erlang/otp",
    "packageName": "erlang/otp",
    "programFiles": [
      "lib/asn1/src/asn1rtt_ber.erl",
      "lib/asn1/src/asn1rtt_per_common.erl",
      "lib/asn1/src/asn1rtt_jer.erl"
    ],
    "collectionURL": "https://github.com",
    "defaultStatus": "unknown",
    "programRoutines": [
      {
        "name": "asn1rtt_ber:dec_subidentifiers/3"
      },
      {
        "name": "asn1rtt_per_common:dec_subidentifiers/3"
      },
      {
        "name": "asn1rtt_jer:json2oid/1"
      }
    ]
  }
]
Related CVEs
CVE-2026-65634

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#1881 · Revision 1
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Publisher date
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