Threats Tagged 'cve-2026-71225'

A vulnerability in libkcapi causes improper reuse of the Initialization Vector (IV) during one-shot symmetric cipher operations on large inputs (over 64 KiB) in stateful modes like CTR and CBC. This IV reuse weakens data confidentiality by exposing relationships in encrypted plaintext and may affect data integrity due to incorrect cryptographic processing. The flaw can be exploited remotely by crafting large inputs processed by applications using libkcapi. Mitigation involves avoiding one-shot APIs for inputs exceeding 64 KiB and using the streaming interface instead.

A flaw was found in libkcapi. When performing one-shot symmetric cipher operations on large inputs (over 64 KiB) in stateful modes such as Counter (CTR) or Cipher Block Chaining (CBC), the library improperly reuses the Initialization Vector (IV) for each internal data chunk. A remote attacker could potentially exploit this by making an application that uses libkcapi process specially crafted large inputs. This can lead to a significant weakening of data confidentiality, as the repeated IV use can expose relationships in encrypted plaintext, and may also affect data integrity by causing incorrect cryptographic processing.