CVE-2026-49759

Ein Angreifer kann mehrere Schwachstellen in Erlang/OTP ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.

## Summary 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. ## Configurations SCTP support must be compiled into OTP. A listening SCTP socket must be opened via `gen_sctp` with the default `inet` backend and must be reachable from the attacker's network. Windows builds are unaffected as SCTP is not supported on Windows.