CVE-2026-13758
Description
A flaw was found in CryptX for Perl. The library performs a non-constant time comparison of Authenticated Encryption with Associated Data (AEAD) authentication tags in its streaming decryption function. This timing difference creates a tag-verification oracle, allowing a remote attacker to submit multiple candidate tags and measure the timing. By exploiting this, an attacker can recover the expected tag byte by byte, leading to the forgery of messages that appear legitimate.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Understanding the Weakness (CWE)
Confidentiality,Access Control
Technical Impact: Read Application Data; Bypass Protection Mechanism
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