CVE-2026-68956— SSH daemon allocates unbounded idle session channels, bypassing max_channels
一分钟漏洞结论
影响对象
Erlang OTP
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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
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一、 漏洞 CVE-2026-68956 基础信息
漏洞信息
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Vulnerability Title
SSH daemon allocates unbounded idle session channels, bypassing max_channels
来源: CVE Program / CVE List V5
Vulnerability Description
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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-68956 的公开POC
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CVE-2026-68956 补丁与修复 (1)
CVE-2026-68956 其他参考 (3)
同批安全公告 · Erlang · 2026-09-22 · 共 3 条
| CVE-2026-89422 | 9.3 CRITICAL | TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_sha |
| CVE-2026-65634 | 8.2 HIGH | Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder |
IV. Related Vulnerabilities
V. Comments for CVE-2026-68956
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