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Erlang/OTP CVE-2026-49759

| EUVDEUVD-2026-36053 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-06-10 EEF
Buffer Overflow Denial Of Service Stack Overflow Otp Erlang
8.8
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
8.8 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
8.2 HIGH
qualitative

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

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

Lifecycle Timeline

3
Source Code Evidence Fetched
Jun 10, 2026 - 16:33 vuln.today
Analysis Generated
Jun 10, 2026 - 16:33 vuln.today
CVSS changed
Jun 10, 2026 - 16:22 NVD
8.8 (HIGH)

DescriptionCVE.org

Stack-based Buffer Overflow vulnerability in Erlang OTP erts (inet_drv) allows an unauthenticated remote attacker to crash the BEAM VM by sending a crafted SCTP ERROR chunk.

The sctp_parse_error_chunk function in erts/emulator/drivers/common/inet_drv.c parses SCTP ERROR chunks and writes cause codes into a fixed-size stack-allocated ErlDrvTermData spec[] array without checking bounds. A remote attacker who has established an SCTP association to a listening port can send a single crafted SCTP ERROR chunk containing enough cause codes to overflow the stack buffer, crashing the VM. The attacker can only write 16-bit values interleaved with a fixed tag, so the overflow does not provide a controlled return address, limiting exploitation to Denial of Service.

A crafted SCTP ERROR chunk may also leak bits and pieces of Erlang VM memory into the received error packet observed by the Erlang process. Such data is already readable by the user running the Erlang VM, so the disclosure scope is limited.

This issue affects OTP from OTP 17.0 before 27.3.4.13, 28.5.0.2 and 29.0.2, corresponding to erts from 6.0 before 15.2.7.9, 16.4.0.2 and 17.0.2.

AnalysisAI

Denial of service in Erlang/OTP erts (inet_drv SCTP handler) lets unauthenticated remote attackers crash the BEAM VM by sending a single crafted SCTP ERROR chunk to a listening SCTP port. The flaw is a stack-based buffer overflow (CWE-121) in sctp_parse_error_chunk, with the publicly disclosed advisory from the Erlang Ecosystem Foundation (EEF) and an upstream commit confirming the fix; no public exploit identified at time of analysis, and the overflow only permits writing 16-bit values interleaved with a fixed tag, limiting impact to DoS plus minor memory disclosure.

Technical ContextAI

Erlang/OTP is the runtime system powering the BEAM virtual machine used by telecom, messaging, and distributed systems (e.g., RabbitMQ, Ejabberd). The vulnerable code lives in erts/emulator/drivers/common/inet_drv.c, the C-level inet driver bridging BEAM I/O to the OS socket layer. The function sctp_parse_error_chunk iterates over cause codes inside an SCTP ERROR chunk and appends them to a fixed-size stack array of ErlDrvTermData (the spec[] term buffer) without checking that the running index stays within PACKET_ERL_DRV_TERM_DATA_LEN. CWE-121 (Stack-based Buffer Overflow) is the root cause class: the upstream patch (commit 3983d49) threads a spec_size argument through sctp_parse_error_chunk, sctp_parse_async_event, inet_async_binary_data, and packet_binary_message, and introduces a truncation check that stops writing when there is no room for the next worst-case term, emitting a truncation marker instead.

RemediationAI

Vendor-released patches are available: upgrade to Erlang/OTP 27.3.4.13, 28.5.0.2, or 29.0.2 (or later) per the GHSA-6f4f-chj5-5g97 advisory, with the upstream fix in commit 3983d495284331c121f600a80bac9fcf4e16381e. If immediate patching is not possible, the most effective compensating control is to stop listening on SCTP - disable SCTP listeners in application code or block IP protocol 132 at the network edge using stateful firewalls or ACLs on upstream routers; this fully neutralizes the attack surface but will break any service that legitimately relies on SCTP (telecom signaling, M3UA/Diameter gateways, certain WebRTC data channels). Where SCTP must remain enabled, restrict source IPs to known peers via firewall rules and consider terminating SCTP at an intermediate gateway that re-encodes traffic, accepting the latency and operational complexity cost. Monitor BEAM VM crash/restart events as a detection signal until patches are deployed.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
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

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CVE-2026-49759 vulnerability details – vuln.today
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