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CVE-2026-65634

CVE-2026-65634

waiting for further signalsZero needs more public information before it can validate it.

GHSA-qghx-23m5-r55m ↗EUVD-2026-84340 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
OTP >= 17.0; >= 3.0
fixed in 27.3.4.18, 28.5.0.7, 29.1.1, 5.3.4.3, 5.4.3.1, 5.5.2
CWE-407 Inefficient Algorithmic Complexity
ETK-2026-1652Zero's internal tracking ID, independent of the CVE number., permanent identifier
cvss8.2cna vendorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6d 13h 54msince last run
14mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
trigger signal (cve.org) +0hwaiting for further signals+550h02m
0
+2h
+4h
+6h
+8h
+10h

description

Erlang/OTP ASN.1 versions before the fixed releases can use excessive CPU when decoding a malformed-size object identifier. An unauthenticated remote attacker may cause denial of service when a service parses attacker-controlled ASN.1 data, including peer certificates during TLS handshakes.

mitigation

Upgrade OTP to 27.3.4.18, 28.5.0.7, 29.1.1; asn1 to 5.3.4.3, 5.4.3.1, 5.5.2 or later.

fixed in 27.3.4.18, 28.5.0.7, 29.1.1, 5.3.4.3, 5.4.3.1, 5.5.2

check
no
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
–
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
0.27%17th percentile
agent run time
14m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-09-22 08:49Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

No artifact: an exploit or check was attempted but could not be produced at this moment.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-09-22 08:49Z
  2. 2026-09-22 08:49Z

this entry in the feed

GET /api/v1/feed/CVE-2026-65634

{
  "etk_id": "ETK-2026-1652",
  "cve_id": "CVE-2026-65634",
  "display_id": "CVE-2026-65634",
  "ghsa_id": "GHSA-qghx-23m5-r55m",
  "euvd_id": "EUVD-2026-84340",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Algorithmic complexity flaw in Erlang/OTP ASN.1 OID decoding",
  "summary": "Erlang/OTP ASN.1 versions before the fixed releases can use excessive CPU when decoding a malformed-size object identifier. An unauthenticated remote attacker may cause denial of service when a service parses attacker-controlled ASN.1 data, including peer certificates during TLS handshakes.",
  "mitigation": "Upgrade OTP to 27.3.4.18, 28.5.0.7, 29.1.1; asn1 to 5.3.4.3, 5.4.3.1, 5.5.2 or later.",
  "vendor": "otp",
  "product": "OTP",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 17.0"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "27.3.4.18",
        "28.5.0.7",
        "29.1.1"
      ],
      "package_name": "OTP",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.0"
      ],
      "ecosystem": "otp",
      "fixed_versions": [
        "5.3.4.3",
        "5.4.3.1",
        "5.5.2"
      ],
      "package_name": "asn1",
      "purl": null
    }
  ],
  "cwes": [
    407
  ],
  "cvss_score": 8.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "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",
  "epss_score": 0.0027,
  "epss_percentile": 0.1739,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 13.949322833333333,
  "t0_at": "2026-09-22T08:49:24.743000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-09-22T08:49:24.743000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-22T08:49:24.743000+00:00",
      "url": "https://github.com/erlang/otp/security/advisories/GHSA-qghx-23m5-r55m"
    }
  }
}

published 2026-10-15 06:37Z
last change 2026-10-21 19:22Z

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