---
title: "CVE-2026-7598\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-7598?format=md
keywords: index, follow
---

# CVE-2026-7598

Publication date 1 May 2026

Last updated 29 June 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.3 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-7598?format=md#impact-score)

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## Description

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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libssh2 | 26.04 LTS resolute | Fixed 1.11.1-1ubuntu0.26.04.1 |
| 25.10 questing | Fixed 1.11.1-1ubuntu0.25.10.1 |
| 24.04 LTS noble | Fixed 1.11.0-4.1ubuntu0.24.04.1 |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |
| 14.04 LTS trusty | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2026-7598?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| libssh2 | * Upstream:   [256d04b](https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1) |

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-7598?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-7598?format=md)

**Base score**

6.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | None |
  | Privileges required | None |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | Low |
  | Vulnerable system - Integrity impact | Low |
  | Vulnerable system - Availability impact | Low |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.9 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-7598)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-7598)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-7598)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-7598)

### Related Ubuntu Security Notices (USN)

+ [USN-8309-1](https://usn.ubuntu.com/USN-8309-1)
+ libssh2 vulnerability
+ 26 May 2026

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-7598>
* <https://github.com/libssh2/libssh2/pull/1858>