Vulnerability-Lookup

UBUNTU-CVE-2026-65634 (CVE-2026-65634)

Vulnerability from osv_ubuntu – Published: 2026-09-22 09:17 – Updated: 2026-09-23 23:32 – Source website

Details

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 associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1. This issue affects OTP from OTP 17.0 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP 17.0, corresponding to asn1 before 3.0, is affected is unknown.

Severity

8.2 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-65634	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-65634	REPORT
	https://cna.erlef.org/cves/CVE-2026-65634.html	REPORT
	https://github.com/erlang/otp/commit/0fe2c02fdc06…	REPORT
	https://github.com/erlang/otp/security/advisories…	REPORT
	https://osv.dev/vulnerability/EEF-CVE-2026-65634	REPORT
	https://www.erlang.org/doc/system/versions.html#o…	REPORT

JSON

To clipboard

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  "aliases": [],
  "details": "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 associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1. This issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP\u00a017.0, corresponding to asn1 before 3.0, is affected is unknown.",
  "id": "UBUNTU-CVE-2026-65634",
  "modified": "2026-09-23T23:32:57Z",
  "published": "2026-09-22T09:17:00Z",
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      "url": "https://github.com/erlang/otp/security/advisories/GHSA-qghx-23m5-r55m"
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      "type": "REPORT",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-65634"
    },
    {
      "type": "REPORT",
      "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
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  "related": [],
  "schema_version": "1.7.0",
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      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
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    {
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      "type": "Ubuntu"
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}

CVE-2026-65634 (GCVE-0-2026-65634)

Vulnerability from cvelistv5 – Published: 2026-09-22 08:49 – Updated: 2026-09-24 20:06

Title

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

Summary

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-22 10:12 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

EEF mitre root

References

5 references

URL	Tags
https://github.com/erlang/otp/security/advisories…	relatedvendor-advisory
https://cna.erlef.org/cves/CVE-2026-65634.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-65634	related
https://www.erlang.org/doc/system/versions.html#o…	x_version-scheme
https://github.com/erlang/otp/commit/0fe2c02fdc06…	patch

Impacted products

3 products

Vendor	Product	Version
Erlang	OTP	Affected: 17.0 , < * (otp) cpe:2.3:a:erlang:erlang\/otp::::::::
Erlang	OTP	Affected: 3.0 , < * (otp) cpe:2.3:a:erlang:erlang\/otp::::::::
Erlang	OTP	Affected: 84adefa331c4159d432d22840663c38f155cd4c1 , < 0fe2c02fdc06fab1c63be9db1a7456993d20f838 (git) Unaffected: 0fe2c02fdc06fab1c63be9db1a7456993d20f838 , < * (git) cpe:2.3:a:erlang:erlang\/otp::::::::

Date Public

2026-09-22 08:49

Credits

tynus2 Lukas Backström John Högberg

Show details on NVD website

JSON

To clipboard

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              "base64": false,
              "type": "text/markdown",
              "value": "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.\n\nThe 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.\n\nThe 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).\n\nThis vulnerability is associated with program files `lib/asn1/src/asn1rtt_ber.erl`, `lib/asn1/src/asn1rtt_per_common.erl` and `lib/asn1/src/asn1rtt_jer.erl` and program routines `asn1rtt_ber:dec_subidentifiers/3`, `asn1rtt_per_common:dec_subidentifiers/3` and `asn1rtt_jer:json2oid/1`.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP\u00a017.0, corresponding to asn1 before 3.0, is affected is unknown."
            }
          ],
          "value": "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.\n\nThe 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.\n\nThe 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).\n\nThis vulnerability is associated with program files lib/asn1/src/asn1rtt_ber.erl, lib/asn1/src/asn1rtt_per_common.erl and lib/asn1/src/asn1rtt_jer.erl and program routines asn1rtt_ber:dec_subidentifiers/3, asn1rtt_per_common:dec_subidentifiers/3 and asn1rtt_jer:json2oid/1.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to asn1 from 3.0 before 5.3.4.3, 5.4.3.1, and 5.5.2. Whether OTP before OTP\u00a017.0, corresponding to asn1 before 3.0, is affected is unknown."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-229",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-229 Serialized Data Parameter Blowup"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-407",
              "description": "CWE-407 Inefficient Algorithmic Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-24T20:06:38.007Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "name": "GitHub Advisory",
          "tags": [
            "related",
            "vendor-advisory"
          ],
          "url": "https://github.com/erlang/otp/security/advisories/GHSA-qghx-23m5-r55m"
        },
        {
          "name": "EEF CNA record for CVE-2026-65634",
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-65634.html"
        },
        {
          "name": "OSV record EEF-CVE-2026-65634",
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-65634"
        },
        {
          "name": "Erlang/OTP version ordering",
          "tags": [
            "x_version-scheme"
          ],
          "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
        },
        {
          "name": "Fix commit 0fe2c02 in erlang/otp",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/erlang/otp/commit/0fe2c02fdc06fab1c63be9db1a7456993d20f838"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-65634",
    "datePublished": "2026-09-22T08:49:24.743Z",
    "dateReserved": "2026-07-22T13:58:26.233Z",
    "dateUpdated": "2026-09-24T20:06:38.007Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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Nomenclature

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2026-65634 (CVE-2026-65634)

CVE-2026-65634 (GCVE-0-2026-65634)

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