---
title: "CVE-2026-4541\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-2026-4541?format=md
keywords: index, follow
---

# CVE-2026-4541

Publication date 22 March 2026

Last updated 10 July 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**2.5 · Low**

[Score breakdown](https://ubuntu.com/security/CVE-2026-4541?format=md#impact-score)

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## Description

A flaw has been found in janmojzis tinyssh up to 20250501. Impacted is an
unknown function of the file tinyssh/crypto\_sign\_ed25519\_tinyssh.c of the
component Ed25519 Signature Handler. This manipulation causes improper
verification of cryptographic signature. The attack is restricted to local
execution. The attack's complexity is rated as high. The exploitability is
considered difficult. The exploit has been published and may be used.
Upgrading to version 20260301 is recommended to address this issue. Patch
name: 9c87269607e0d7d20174df742accc49c042cff17. Upgrading the affected
component is recommended.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| tinyssh | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | 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)

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-4541?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-4541?format=md)

**Base score**

1.1 · Low

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 1.1 · Low |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-4541)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-4541)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-4541)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-4541)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-4541>
* <https://github.com/janmojzis/tinyssh/>
* <https://github.com/janmojzis/tinyssh/commit/9c87269607e0d7d20174df742accc49c042cff17>
* <https://github.com/janmojzis/tinyssh/issues/101>
* <https://github.com/janmojzis/tinyssh/issues/101#issue-3983586116>
* <https://github.com/janmojzis/tinyssh/pull/102>
* <https://github.com/janmojzis/tinyssh/releases/tag/20260301>
* <https://vuldb.com/?ctiid.352358>
* <https://vuldb.com/?id.352358>
* <https://vuldb.com/?submit.774687>