CVE-2026-56855 Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connectio...

libssh: libssh: denial of service via zero advertised channel packet size

A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSHMSGCHANNELOPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service...

CVE-2025-32433

CVE-2025-32433 – Erlang/OTP SSH RCE 脆弱性 📌 概要 CVE-2025-32433 は、Erlang/OTP SSH デーモンに影響を与える リモートコード実行 RCE 脆弱性です。 根本的な原因は、認証前の SSH チャネルリクエストの不適切な処理にあり、攻撃者がこれを細工することで、 認証前に 任意のコマンド実行を引き起こす可能性があります。 添付の PoC は、このような細工された SSH パケットを送信することを示しています。デフォルトではターゲット上に /lab.txt を作成しますが、他のコマンドに応用可能です。 ⚠️ 免責事項:...

Medium: amazon-cloudwatch-agent

Issue Overview: x509.Certificate.VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name SAN entries. This caused strings.Splithost, "." to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically bas...

CVE-2026-48113

The CVE-2026-48113 entry concerns Chisel, a TCP/UDP tunnel over SSH, where ACL restrictions provided by --authfile are bypassed on post-handshake SSH channels. Authenticated clients can open channels to arbitrary host:port destinations reachable from the server because ACL checks are performed on...

PT-2026-61858

Name of the Vulnerable Software and Affected Versions libssh affected versions not specified Description A flaw exists where a remote authenticated peer can advertise a zero maximum packet size within the SSH MSG CHANNEL OPEN message. This causes subsequent channel writes to enter an infinite loo...

Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : Go Cryptography vulnerabilities (USN-8447-1)

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8447-1 advisory. It was discovered that Go Cryptography did not properly handle SSH global request responses. ...

GO-2026-5054 Chisel has an ACL Bypass via Post-Handshake SSH Channel ExtraData Injection in github.com/jpillora/chisel

Chisel has an ACL Bypass via Post-Handshake SSH Channel ExtraData Injection in github.com/jpillora/chisel...

GHSA-24FP-5V3P-RVPW Chisel has an ACL Bypass via Post-Handshake SSH Channel ExtraData Injection

Summary Authenticated chisel clients can bypass --authfile ACL restrictions and tunnel traffic to arbitrary destinations reachable from the server. The ACL is enforced only during the initial handshake against declared remotes, but never on subsequent SSH channels that carry actual traffic. A...

Chisel has an ACL Bypass via Post-Handshake SSH Channel ExtraData Injection

Summary Authenticated chisel clients can bypass --authfile ACL restrictions and tunnel traffic to arbitrary destinations reachable from the server. The ACL is enforced only during the initial handshake against declared remotes, but never on subsequent SSH channels that carry actual traffic. A...

CVE-2026-39834

A flaw was found in golang.org/x/crypto/ssh. When a remote attacker attempts to write data larger than 4GB in a single call on an SSH Secure Shell channel, an integer overflow occurs in the internal payload size calculation. This vulnerability causes the write loop to spin indefinitely,...

SUSE CVE-2026-39834

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...

AZL-87762 CVE-2026-39834 affecting package gh for versions less than 2.62.0-16

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...

AZL-87203 CVE-2026-39834 affecting package buildah 1.43.1-2

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...

AZL-88065 CVE-2026-39834 affecting package moby-engine for versions less than 25.0.3-18

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...

AZL-87687 CVE-2026-39834 affecting package docker-compose for versions less than 2.27.0-11

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...

AZL-87972 CVE-2026-39834 affecting package kubevirt for versions less than 1.7.1-7

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...

AZL-87423 CVE-2026-39834 affecting package cert-manager for versions less than 1.12.15-9

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...

AZL-87648 CVE-2026-39834 affecting package docker-buildx for versions less than 0.14.0-13

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...

AZL-87302 CVE-2026-39834 affecting package podman 5.6.1-9

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...