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erlang

A resource exhaustion vulnerability exists in Erlang/OTP ssh where an authenticated remote attacker can exhaust node memory by repeatedly opening session channels that never receive a handler. This leads to accumulation of channel records in memory until the node runs out of memory and the Erlang emulator terminates, affecting all applications on the node. No file contents, credentials, or write access are exposed. The vulnerability affects OTP versions from 18.1.2 before 27.3.4.18, 28.5.0.7, and 29.1.1, corresponding to ssh versions from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6. Patch status is not explicitly stated in the provided data.

The vulnerability (CVE-2026-68956) in Erlang/OTP ssh allows an authenticated remote attacker to exhaust node memory by repeatedly opening session channels that are never assigned a handler. The 'session' clause of ssh_connection:handle_msg/4 only checks minimal_remote_max_packet_size before calling setup_session/5, which unconditionally creates a channel record stored in the ETS channel cache. The max_channels daemon option only limits supervisor children and does not account for channels without handlers, making the limit ineffective against this attack. According to RFC 4254 section 5.1, many session channels per connection are permitted, and each channel record consumes a few hundred bytes. Consequently, a single authenticated connection can accumulate many channels, exhausting memory and causing the Erlang emulator to terminate, impacting all applications running on the node. No sensitive data or write access is compromised. The affected OTP versions are from 18.1.2 up to but not including 27.3.4.18, 28.5.0.7, and 29.1.1, with corresponding ssh versions from 4.1.1 up to but not including 5.2.11.13, 5.5.2.6, and 6.0.6. Whether versions before 18.1.2 are affected is unknown. No vendor advisory or patch information is provided in the input.

Detailed information about Allocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP ssh allows an authenticated remote attacker to exhau

Allocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP ssh allows an authenticated remote attacker to exhaust node memory… (CVE-2026-68956) - Live Threat Intelligence - Threat Radar | OffSeq.com

Allocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP ssh allows an authenticated remote attacker to exhaust node memory… (CVE-2026-68956)

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