A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.

According to the versions of the libssh2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function     userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len     leads to integer overflow. The attack may be launched remotely. The name of the patch is     256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this     issue.(CVE-2026-7598)

Tenable has extracted the preceding description block directly from the EulerOS libssh2 security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6365 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6365-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     June 25, 2026                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : libssh2     CVE ID         : CVE-2025-15661 CVE-2026-7598 CVE-2026-55199 CVE-2026-55200

    Multiple security vulnerabilities were discovered in libssh2, a     client-side C library implementing the SSH2 protocol which could result     in memory disclosure, denial of service or potentially the execution of     arbitrary code.

    For the stable distribution (trixie), these problems have been fixed in     version 1.11.1-1+deb13u1.

    We recommend that you upgrade your libssh2 packages.

    For the detailed security status of libssh2 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libssh2

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1872 advisory.

    gitoxide is an implementation of git written in Rust. Prior to 0.21.1, a malicious tree can be constructed     that will, when checked out with gitoxide, permit writing an attacker-controlled symlink into any existing     directory the user has write access to. During checkout, all symlink index entries are deferred and     created after regular files using a single shared gix_worktree::Stack. Internally, this uses a     gix_fs::Stack. gix_fs::Stack::make_relative_path_current() caches validated path prefixes: when the     previously-processed leaf component exactly matches the leading component(s) of the next path, the leaf-     to-directory transition at gix-fs/src/stack.rs invokes only delegate.push_directory(), never     delegate.push(). In gix_worktree::stack::delegate::StackDelegate, when the state member is     State::CreateDirectoryAndAttributesStack, Attributes::push_directory() only loads attributes (from the     ODB, in the clone case), and does not perform any other checks. The on-disk symlink_metadata() check and     unlink-on-collision live in StackDelegate::push()'s invocation of create_leading_directory(), which is     therefore bypassed for the cached prefix. The final symlink is created with plain     std::os::unix::fs::symlink, which follows symlinks in parent directories. Therefore, it's possible to     provide a tree with duplicate symlink and directory entries that exploits this. This vulnerability is     fixed in 0.21.1. (CVE-2026-44471)

    Cargo between 1.68 and 1.96 incorrectly normalized the URLs of third-party registries using the sparse     index protocol. If a hosting provider allowed multiple registries to be hosted with arbitrary names within     the same domain, an attacker able to publish crates in a registry could obtain the credentials of others     users of the same registry. The severity of the vulnerability is **low**, due to the extremely niche     requirements needed to achieve the attack. (CVE-2026-5222)

    A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function     userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len     leads to integer overflow. The attack may be launched remotely. The name of the patch is     256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
    (CVE-2026-7598)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the libssh2 package has been released.

The version of libssh2 installed on the remote host is prior to 1.4.3-12. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3329 advisory.

    A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function     userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len     leads to integer overflow. The attack may be launched remotely. The name of the patch is     256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
    (CVE-2026-7598)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1779 advisory.

    A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function     userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len     leads to integer overflow. The attack may be launched remotely. The name of the patch is     256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
    (CVE-2026-7598)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-1b9134cdc9 advisory.

    This update addresses CVE-2026-7598, a potential heap buffer overflow, which could be triggered remotely     by supplying very long username and/or password strings.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function
    userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len
    leads to integer overflow. The attack may be launched remotely. The name of the patch is
    256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
    (CVE-2026-7598)

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-f87ac8187c advisory.

    This update addresses CVE-2026-7598, a potential heap buffer overflow, which could be triggered remotely     by supplying very long username and/or password strings.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8309-1 advisory.

    It was discovered that libssh2 incorrectly handled username and password length values during SSH password     authentication. A remote attacker could possibly use this issue to cause a denial of service.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of CBL-Mariner Releases installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2026-7598 advisory.

  - A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function     userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len     leads to integer overflow. The attack May be launched remotely. The name of the patch is     256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
    (CVE-2026-7598)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function     userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len     leads to integer overflow. The attack may be launched remotely. The name of the patch is     256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
    (CVE-2026-7598)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
326616	EulerOS 2.0 SP10 : libssh2 (EulerOS-SA-2026-2700)	Nessus	Huawei Local Security Checks	medium
326595	EulerOS 2.0 SP10 : libssh2 (EulerOS-SA-2026-2659)	Nessus	Huawei Local Security Checks	medium
326215	EulerOS 2.0 SP12 : libssh2 (EulerOS-SA-2026-2543)	Nessus	Huawei Local Security Checks	medium
326136	EulerOS 2.0 SP12 : libssh2 (EulerOS-SA-2026-2603)	Nessus	Huawei Local Security Checks	medium
323060	Debian dsa-6365 : libssh2-1-dev - security update	Nessus	Debian Local Security Checks	critical
322058	Amazon Linux 2023 : cargo-c (ALAS2023-2026-1872)	Nessus	Amazon Linux Local Security Checks	medium
321399	Photon OS 5.0: Libssh2 PHSA-2026-5.0-0857	Nessus	PhotonOS Local Security Checks	medium
319781	Amazon Linux 2 : libssh2, --advisory ALAS2-2026-3329 (ALAS-2026-3329)	Nessus	Amazon Linux Local Security Checks	medium
319779	Amazon Linux 2023 : libssh2, libssh2-devel (ALAS2023-2026-1779)	Nessus	Amazon Linux Local Security Checks	medium
319615	Fedora 43 : libssh2 (2026-1b9134cdc9)	Nessus	Fedora Local Security Checks	medium
442555	Alpine: multiple libssh2 packages: security update to 1.11.1-r1	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
442555	Alpine: multiple libssh2 packages: security update to 1.11.1-r1	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
317985	Fedora 44 : libssh2 (2026-f87ac8187c)	Nessus	Fedora Local Security Checks	medium
317098	Ubuntu 24.04 LTS / 25.10 / 26.04 LTS : libssh2 vulnerability (USN-8309-1)	Nessus	Ubuntu Local Security Checks	medium
312357	Azure Linux 3.0 Security Update: CBL-Mariner Releases (CVE-2026-7598)	Nessus	Azure Linux Local Security Checks	medium
311788	Linux Distros Unpatched Vulnerability : CVE-2026-7598	Nessus	Misc.	high

Detections

Analytics

CVE-2026-7598

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Tenable Plugins

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critical

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