| Package | Affected versions | Patched versions |
|---|---|---|
| erlang/otp | ≥ 17.0, < 26.2.5.18≥ 27.0, < 27.3.4.9≥ 28.0, < 28.4.1 | 26.2.5.1827.3.4.928.4.1 |
| erlang/ssh | ≥ 3.0.1, < 5.1.4.14≥ 5.2, < 5.2.11.6≥ 5.5, ≤ 5.5.1 | 5.1.4.145.2.11.6 |
Improper Handling of Highly Compressed Data (Compression Bomb) vulnerability in Erlang OTP ssh (ssh_transport modules) allows Denial of Service via Resource Depletion. The SSH transport layer advertises legacy zlib compression by default and inflates attacker-controlled payloads pre-authentication without any size limit, enabling reliable memory exhaustion DoS. Two compression algorithms are affected: * zlib: Activates immediately after key exchange, enabling unauthenticated attacks * [email protected]: Activates post-authentication, enabling authenticated attacks Each SSH packet can decompress ~255 MB from 256 KB of wire data (1029:1 amplification ratio). Multiple packets can rapidly exhaust available memory, causing OOM kills in memory-constrained environments. This vulnerability is associated with program files lib/ssh/src/ssh_transport.erl and program routines ssh_transport:decompress/2, ssh_transport:handle_packet_part/4. This issue affects OTP from OTP 17.0 before OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to ssh from 3.0.1 before 5.5.1, 5.2.11.6 and 5.1.4.14.
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