K000163176: libssh vulnerability CVE-2026-59845

Security Advisory Description A flaw was found in libssh. When ProxyCommand is used, an unchecked fork failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service. CVE-2026-59845 Impact There is n...

RLSA-2026:62217 Moderate: 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: denial of service via zero advertised channel packet size CVE-2026-59843 libssh: libssh: denial of service via oversized SFTP read length CVE-2026-598...

libssh security update

An update is available for libssh. This update affects Rocky Linux 9. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list libssh is a library which implements the SSH protocol. It can be used to...

RLSA-2026:62218 Moderate: 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: denial of service via zero advertised channel packet size CVE-2026-59843 libssh: libssh: denial of service via oversized SFTP read length CVE-2026-598...

libssh security update

An update is available for libssh. This update affects Rocky Linux 8. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list libssh is a library which implements the SSH protocol. It can be used to...

RockyLinux 8 : libssh (RLSA-2026:62218)

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:62218 advisory. libssh: libssh: denial of service via zero advertised channel packet size CVE-2026-59843 libssh: libssh: denial of service via oversized SFTP read lengt...

RockyLinux 9 : libssh (RLSA-2026:62217)

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:62217 advisory. libssh: libssh: denial of service via zero advertised channel packet size CVE-2026-59843 libssh: libssh: denial of service via oversized SFTP read lengt...

AlmaLinux 9 : libssh (ALSA-2026:62217)

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:62217 advisory. libssh: libssh: denial of service via zero advertised channel packet size CVE-2026-59843 libssh: libssh: denial of service via oversized SFTP read length...

libssh: libssh: denial of service via unchecked ProxyCommand fork() failure

A flaw was found in libssh. When ProxyCommand is used, an unchecked fork failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service...

Moderate: Red Hat Security Advisory: libssh security update

An update for libssh is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the...

libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification

A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effectively remove integrity protection, allowing an in-path attacker to modify plaintext on the wire without detection...

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...

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: information disclosure via ProxyCommand %r username expansion

A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell metacharacters, exposing environment variables and causing unintended shell behavior...

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...

libssh: libssh: use-after-free via data callbacks on closed channels

A flaw was found in libssh. If data packets are processed after a channel is closed, channel data callbacks can be invoked after the associated data has already been freed, leading to crashes or possible use-after-free conditions...

Moderate: Red Hat Security Advisory: libssh security update

An update for libssh is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the...

libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification

A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effectively remove integrity protection, allowing an in-path attacker to modify plaintext on the wire without detection...

libssh: libssh: denial of service via unchecked ProxyCommand fork() failure

A flaw was found in libssh. When ProxyCommand is used, an unchecked fork failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service...

libssh: libssh: use-after-free via data callbacks on closed channels

A flaw was found in libssh. If data packets are processed after a channel is closed, channel data callbacks can be invoked after the associated data has already been freed, leading to crashes or possible use-after-free conditions...