---
title: "CVE-2026-2968\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-2026-2968?format=md
keywords: index, follow
---

# CVE-2026-2968

Publication date 23 February 2026

Last updated 11 September 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**3.7 · Low**

[Score breakdown](https://ubuntu.com/security/CVE-2026-2968?format=md#impact-score)

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## Description

A vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts
the function mg\_chacha20\_poly1305\_decrypt of the file /src/tls\_chacha20.c
of the component Poly1305 Authentication Tag Handler. The manipulation
results in improper verification of cryptographic signature. The attack may
be launched remotely. This attack is characterized by high complexity. The
exploitability is said to be difficult. The exploit is now public and may
be used. The vendor was contacted early about this disclosure but did not
respond in any way.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2026-2968?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| swupdate | 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 |
| opencpn | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 24.04 LTS noble | Not affected |
| 22.04 LTS jammy | Not affected |
| 20.04 LTS focal | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [rodrigo-zaiden](https://launchpad.net/~rodrigo-zaiden)

although opencpn includes mongoose library, the affected
method is not present
implementation of the affected method is found in swupdate

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-2968?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-2968?format=md)

**Base score**

2.9 · Low

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Attack requirements | None |
  | Privileges required | None |
  | 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 | 2.9 · Low |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:H/AT:N/PR:N/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-2026-2968)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-2968)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-2968)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-2968)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-2968>
* <https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md>
* <https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc>
* <https://vuldb.com/?ctiid.347335>
* <https://vuldb.com/?id.347335>
* <https://vuldb.com/?submit.757091>