Bug 2487607 (CVE-2026-49759)

Summary: CVE-2026-49759 erlang: Erlang OTP: Denial of Service via crafted SCTP ERROR chunk
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: eglynn, jjoyce, jpretori, jschluet, lhh, mburns, mgarciac
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Erlang OTP (Open Telecom Platform) erts, specifically within the `inet_drv` component. An unauthenticated remote attacker can exploit a stack-based buffer overflow vulnerability by sending a specially crafted Stream Control Transmission Protocol (SCTP) ERROR chunk. This can lead to a Denial of Service (DoS) by crashing the BEAM virtual machine. Additionally, this flaw may result in limited information disclosure by leaking small portions of Erlang VM memory.
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Bug Depends On: 2490026, 2490027    
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Description OSIDB Bzimport 2026-06-10 16:02:15 UTC 
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.