libssh: libssh: stack buffer overflow in SFTP server longname construction

A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead ...

libssh: libssh: denial of service via oversized SFTP read length

A flaw was found in libssh. A remote authenticated client can issue SSHFXPREAD requests with an arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially exhaust it through repeated requests...

libssh: libssh: denial of service via SFTP responses with unknown request IDs

A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh clients keep queued indefinitely, causing unbounded memory growth and client-side denial of service...

CVE-2026-54336

JumpServer is an open source bastion host and an operation and maintenance security audit system. From 4.8.0 until 4.10.17, an authenticated user with SFTP permission to an authorized asset can submit crafted traversal paths through the KoKo Web Terminal SFTP feature, causing AssetDir.GetRealPath...

CVE-2026-54336

JumpServer (open source bastion host and O&M security audit system) is affected by a path traversal vulnerability in the KoKo Web Terminal SFTP feature (versions 4.8.0 through 4.10.17). An authenticated user with SFTP permission to an authorized asset can submit crafted traversal paths that cause...

CVE-2026-54336 JumpServer: KoKo Web Terminal SFTP Path Traversal on Authorized Asset

JumpServer is an open source bastion host and an operation and maintenance security audit system. From 4.8.0 until 4.10.17, an authenticated user with SFTP permission to an authorized asset can submit crafted traversal paths through the KoKo Web Terminal SFTP feature, causing AssetDir.GetRealPath...

CVE-2026-54336 JumpServer: KoKo Web Terminal SFTP Path Traversal on Authorized Asset

JumpServer is an open source bastion host and an operation and maintenance security audit system. From 4.8.0 until 4.10.17, an authenticated user with SFTP permission to an authorized asset can submit crafted traversal paths through the KoKo Web Terminal SFTP feature, causing AssetDir.GetRealPath...

ANT-2026-T6EKK5DB · openssh · heap-buffer-overflow (READ of size 1, 1 byte before allocation)

heap-buffer-overflow low Severity Claude critical · Security research firm low · Maintainer - Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Calif. ANT-2026-T6EKK5DB: heap-buffer-overflow READ of size 1, 1 byte...

ANT-2026-Q5A1RHS0 · libssh2/libssh2 · double_free

double-free high CVE-2026-66032 Severity Claude critical · Security research firm high · Maintainer - Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Calif. ANT-2026-Q5A1RHS0: SFTP double-free via server-controlled...

curl: curl: Man-in-the-middle attack via SSH host key bypass

A flaw was found in curl. When a libcurl-based application uses SCP:// or SFTP:// for transfers and employs the CURLOPTSSHKEYFUNCTION callback, it may silently accept an untrusted server. This occurs if the server's host key type differs from the one stored in the knownhosts file. The callback...

BIT-RCLONE-2026-71312 rclone: PowerShell Smart-Quote Filename Injection Enables SFTP Server-Side Command Execution

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to v1.75.0, rclone interpolates remote SFTP paths into PowerShell hash commands in backend/sftp/sftp.go, and quoteOrEscapeShellPath escapes only ASCII apostrophe even though...

curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP

A flaw was found in curl. When a user invokes curl with a schemeless URL and specifies SFTP SSH File Transfer Protocol or SCP Secure Copy Protocol as the default protocol, the tool layer fails to initialize critical SSH security options. This bypasses host verification, allowing curl to connect t...

PT-2026-73430

rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.40.0 until 1.75.0, rclone serve restic does not correctly reject URL paths beginning with ../ in cmd/serve/restic/restic.go WithRemote, which accepts a leading parent path and pass...

Important: libssh2

Issue Overview: libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftpopen function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSHFXPOPEN with...

Important: libssh2

Issue Overview: libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftpopen function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSHFXPOPEN with...

PT-2026-76818

JumpServer is an open source bastion host and an operation and maintenance security audit system. From 4.8.0 until 4.10.17, an authenticated user with SFTP permission to an authorized asset can submit crafted traversal paths through the KoKo Web Terminal SFTP feature, causing AssetDir.GetRealPath...

PT-2026-73433

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to v1.75.0, rclone interpolates remote SFTP paths into PowerShell hash commands in backend/sftp/sftp.go, and quoteOrEscapeShellPath escapes only ASCII apostrophe even though...

ALSA-2026:55855 Important: libssh security update

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications. Security Fixes: libssh: libssh: information disclosure via short GSSAPI Curve25519 public key CVE-2026-59842 libssh: libssh: denial of service via zero advertised channel packet size...

Directory Traversal

Spring Integration is vulnerable to Directory Traversal. The vulnerability is due to insufficient validation of file paths received from malicious or compromised FTP/SFTP/SMB servers, which allows an attacker to write arbitrary content to files outside the configured local directory...

SUSE SLED15: openssh / openssh-askpass-gnome / openssh-clients / openssh-common / etc (SUSE-SU-2026:3605-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3605-1 advisory. - Backported support for the mlkemx25519 key exchange from upstream jscPED-16473. - CVE-2026-59995: sftp:...