CVE-2025-59438
Description
A padding oracle attack vector has been discovered in MbedTLS. In symmetric encryption modes that involve padding, if an attacker can submit ciphertexts for decryption and learn whether the padding is valid, this provides partial information about the plaintext. If the attacker can also submit input that the victim encrypts together with a secret, this can allow the attacker to recover the whole secret part. This is known as a padding oracle attack. The attacker may learn the validity of the padding directly or indirectly, for example through timing. As a result local attackers may be able to recover plaintexts encrypted with CBC-PKCS7 or other symmetric encryption mode using padding when it is decrypted through the PSA API.
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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