Detections
Analytics

Amazon Linux 2023 : perl-CryptX, perl-CryptX-tests (ALAS2023-2026-1834)

low Nessus Plugin ID 322012

Language:

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1834 advisory.

 CryptX versions before 0.088_001 for Perl compare AEAD authentication tags in non-constant time in the streaming decrypt_done path.

 The decrypt_done($tag) form compares it against the computed tag with memNE (memcmp() != 0), which short- circuits on the first differing byte, so its run time depends on the number of matching leading bytes.
 This affects all five AEAD modes: GCM, CCM, ChaCha20Poly1305, EAX and OCB. The one-shot *_decrypt_verify helpers are unaffected; they verify the tag inside libtomcrypt with a constant-time comparison.

 The timing difference is a tag-verification oracle. An attacker who can submit many candidate tags for the same nonce, ciphertext and associated data while measuring the timing precisely enough may recover the expected tag byte by byte and forge a message that verifies. (CVE-2026-13758)

 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. (CVE-2026-41565)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'dnf update perl-CryptX --releasever 2023.12.20260622' or or 'dnf update --advisory ALAS2023-2026-1834 --releasever 2023.12.20260622' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1834.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-13758.html

https://explore.alas.aws.amazon.com/CVE-2026-41565.html

Plugin Details

Severity: Low

ID: 322012

File Name: al2023_ALAS2023-2026-1834.nasl

Version: 1.2

Type: Local

Agent: unix

Published: 6/22/2026

Updated: 9/25/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.75

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 1.9

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2026-13758

CVSS v3

Risk Factor: Low

Base Score: 3.7

Temporal Score: 3.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:perl-cryptx-debuginfo, p-cpe:/a:amazon:linux:perl-cryptx-debugsource, p-cpe:/a:amazon:linux:perl-cryptx-tests, p-cpe:/a:amazon:linux:perl-cryptx

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 6/22/2026

Vulnerability Publication Date: 5/28/2026

Reference Information

CVE: CVE-2026-13758, CVE-2026-41565