Answer in brief
CVE-2026-68956 records a High severity (CVSS 7.1) vulnerability in SSH daemon allocates unbounded idle session channels, bypassing max_channels. The current sources do not mark it as known exploited. The current feed maps Erlang/erlang/otp (generic), Erlang/OTP (generic), Erlang/OTP (generic), Erlang/OTP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Erlang/erlang/otp (generic), Erlang/OTP (generic), Erlang/OTP (generic), Erlang/OTP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Erlang/erlang/otpgeneric | >=84df3d4d0278e21a36a453bfee94799f0df67c2a <* | * |
| Erlang/OTPgeneric | >=17.0 <* | * |
| Erlang/OTPgeneric | >=3.0.1 <* | * |
| Erlang/OTPgeneric | >=84adefa331c4159d432d22840663c38f155cd4c1 <* | * |
| Erlang/OTPgeneric | >=18.1.2 <* | * |
| Erlang/OTPgeneric | >=4.1.1 <* | * |
| Erlang/OTPgeneric | >=84df3d4d0278e21a36a453bfee94799f0df67c2a <* | * |
Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 22, 2026
Allocation of Resources Without Limits or Throttling vulnerability 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 checks only minimal_remote_max_packet_size before calling setup_session/5, which unconditionally builds a #channel{} record and stores it in the ETS channel cache. The max_channels daemon option is consulted only by ssh_channel_sup:max_num_channels_not_exceeded/2, which counts supervisor children, so a channel that never gets a shell, exec, or subsystem handler is invisible to the limit and setting the option to a finite value does not mitigate the attack. RFC 4254 section 5.1 permits many session channels per connection, and each record costs only a few hundred bytes, so a single authenticated connection can accumulate channels until the node runs out of memory and the emulator terminates, affecting every application on it. No file contents, credentials, or write access are obtainable. This issue affects OTP from OTP 18.1.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssh from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6. Whether OTP before OTP 18.1.2, corresponding to ssh before 4.1.1, is affected is unknown.
Quoted source text, attributed separately from HOL analysis.