CVE-2026-49759: Erlang Erlang/otp

High severity, CVSS 8.2. EPSS: 0.5% chance of exploitation in the next 30 days.

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 OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to erts from 6.0 before 15.2.7.9, 16.4.0.2, and 17.0.2. Whether OTP before OTP 17.0, corresponding to erts before 6.0, is affected is unknown.

Affected products

• Erlang Erlang/otp: from 17.0, before 27.3.4.13 (fixed in 27.3.4.13); from 28.0, before 28.5.0.2 (fixed in 28.5.0.2); from 29.0, before 29.0.2 (fixed in 29.0.2)
• Erlang Erts: from 6.0, before 15.2.7.9 (fixed in 15.2.7.9); from 16.0, before 16.4.0.2 (fixed in 16.4.0.2); from 17.0, before 17.0.2 (fixed in 17.0.2)

Published 2026-06-10. Last modified 2026-09-24.