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[USN-8128-1] CryptX vulnerabilities

Posted on 26 March 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8128-1
March 26, 2026

libcryptx-perl vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in CryptX.

Software Description:
- libcryptx-perl: Perl modules providing cryptography based on LibTomCrypt library

Details:

It was discovered that CryptX did not verify authentication tags while
performing GCM and ChaCha20-Poly1305 decryption. An attacker could possibly
use this issue to cause CryptX to accept modified ciphertext, leading to
data integrity violations or authentication bypass. This issue only
affected Ubuntu 18.04 LTS. (CVE-2018-25099)

It was discovered that CryptX included a version of the tomcrypt library
that was susceptible to malformed unicode handling. An attacker could
possibly use this issue to cause unexpected behavior or incorrect
processing of crafted input. This issue only affected Ubuntu 18.04 LTS.
(CVE-2025-40912)

It was discovered that CryptX included a version of the libtommath library
that was susceptible to an integer overflow. An attacker could possibly use
this issue to cause memory corruption or a denial of service.
(CVE-2025-40914)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
libcryptx-perl 0.080-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
libcryptx-perl 0.076-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
libcryptx-perl 0.067-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libcryptx-perl 0.056-1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8128-1
CVE-2018-25099, CVE-2025-40912, CVE-2025-40914

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