---
title: "CVE-2026-41565\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-2026-41565?format=md
keywords: index, follow
---

# CVE-2026-41565

Publication date 28 May 2026

Last updated 6 June 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-41565?format=md#impact-score)

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## Description

CryptX versions before 0.088\_001 for Perl have a stack buffer overflow in
four AEAD decrypt\_verify helpers.
The gcm\_decrypt\_verify, ccm\_decrypt\_verify, chacha20poly1305\_decrypt\_verify
and eax\_decrypt\_verify XS routines copied the caller-supplied
authentication tag into a fixed 144-byte stack buffer (MAXBLOCKSIZE)
without checking the supplied length. A longer tag overwrites the stack
past the buffer. Version 0.088 added the clamp to gcm\_decrypt\_verify, and
0.088\_001 added it to the other three.
Any caller of an affected helper that forwards an attacker-controlled tag
longer than the buffer can trigger the overflow.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libcryptx-perl | 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 v3.0

**Base score**

7.5 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-41565)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-41565)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-41565)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-41565)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-41565>
* <https://lists.security.metacpan.org/cve-announce/msg/40477993/>
* <https://github.com/DCIT/perl-CryptX/commit/57e69e541b0718ca8724c2f61514322a2d859bc1.patch>
* <https://github.com/DCIT/perl-CryptX/commit/7e56347d420aaf43b2ee1586f4a230492ccf1642.patch>
* <https://metacpan.org/release/MIK/CryptX-0.088_001>
* <http://www.openwall.com/lists/oss-security/2026/05/28/10>