CVE-2026-59843

MediumCVSS 6.5/10Last modified Sep 1, 2026

Description

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

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-835 CWE-400

Affected software

No affected versions have been published.

Timeline

Published: Jul 21, 2026
Last modified: Sep 1, 2026
NVD status: Modified

Related CVEs from 2026

CVE-2026-598446.5A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an arbitrarily large length, causing a libssh CVE-2026-598455.9A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals m CVE-2026-598463.9A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell metacharacters, exposing envi CVE-2026-598477.5A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effectively remove integrity prote CVE-2026-598485.3A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh clients keep queued indefinitely,CVE-2026-598497.5A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinit CVE-2026-59857.3A security flaw has been discovered in code-projects Simple IT Discussion Forum 1.0. The affected element is an unknown function of the file CVE-2026-598507.5A flaw was found in libssh. If data packets are processed after a channel is closed, channel data callbacks can be invoked after the associa CVE-2026-598518.8A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled, the gssapi-keyex path does not verify whether the authenticated Kerbe CVE-2026-598536.5SiYuan is an open-source personal knowledge management system. Prior to 3.7.1, the /api/storage/getCriteria endpoint returns saved search cr CVE-2026-598544.9SiYuan is an open-source personal knowledge management system. Prior to 3.7.1, POST /api/file/globalCopyFiles accepts attacker-supplied abso CVE-2026-598558.6SiYuan is an open-source personal knowledge management system. Prior to 3.7.1, Asset.render in app/src/asset/index.ts interpolates the unsan