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Erlang/OTP CVE-2026-65634

| EUVDEUVD-2026-84340 HIGH
Inefficient Algorithmic Complexity (CWE-407)
2026-09-22 EEF
Denial Of Service Otp Suse Erlang
8.2
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

Remote unauthenticated cert parsing before verification (AV:N/PR:N/UI:N/AC:L); crafted-OID payload is easy so AC stays L; availability-only quadratic CPU exhaustion (A:H, C/I:N).

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
POC Analysis Generated
Sep 22, 2026 - 11:20 vuln.today
Metadata Corrected
Sep 22, 2026 - 09:40 vuln.today
tag: Erlang added
Analysis Generated
Sep 22, 2026 - 09:22 vuln.today
CVE Published
Sep 22, 2026 - 08:49 cve.org
HIGH 8.2

DescriptionCVE.org

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.

AnalysisAI

Denial of service in Erlang/OTP's ASN.1 OBJECT IDENTIFIER decoders allows a remote, unauthenticated attacker to stall TLS-processing services by sending a crafted certificate during the handshake. Erlang/OTP releases from OTP 17.0 up to the fixed versions OTP 27.3.4.18, OTP 28.5.0.7 and OTP 29.1.1 are affected whenever the service parses a peer's X.509 certificate - the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers - because the vulnerable BER OID decoder runs before signature and trust-chain verification, so an untrusted self-signed certificate is sufficient to trigger it. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitable against any Erlang/OTP service (versions 17.0 up to 27.3.4.18 / 28.5.0.7 / 29.1.1) that parses a peer's X.509 certificate during the TLS handshake - this is the default for TLS clients (which always parse the server certificate) and for mutual-TLS servers (which parse client certificates). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but bounded-severity issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade to Erlang/OTP 27.3.4.18, 28.5.0.7 or 29.1.1 (shipping asn1 5.3.4.3, 5.4.3.1 and 5.5.2 respectively), which contain the bounded OID/tag decoders from commit 0fe2c02fdc06fab1c63be9db1a7456993d20f838; consult the vendor advisory at https://github.com/erlang/otp/security/advisories/GHSA-qghx-23m5-r55m for the authoritative fixed-version mapping, and note that the patch rejects any OID component exceeding 16 continuation bytes (BER/PER) or a 32-byte JSON subidentifier, so legitimate OIDs with unusually large arcs beyond those limits will now fail to decode. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Erlang/OTP deployments and dependencies such as RabbitMQ, CouchDB, EMQX, and custom Erlang services for affected releases OTP 17.0 through the fixed versions; confirm exposure of TLS clients and mutual-TLS servers to untrusted networks; apply vendor patches OTP 27.3.4.18, OTP 28.5.0.7, or OTP 29.1.1 where feasible, prioritizing internet-facing endpoints. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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CVE-2026-65634 vulnerability details – vuln.today
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