# CVE-2026-71225

## Summary

- **CVE ID:** CVE-2026-71225
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N)
- **CWE:** CWE-330
- **Published:** Aug 5, 2026
- **Last Modified:** Sep 1, 2026

## Description

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.

## Affected Products

- Stephan Muelle — libkcapi (0.10.1)
- Red Hat — Red Hat Hardened Images (1.5.1-0.1.hum1)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-71225)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2462011)
- [CNA](https://access.redhat.com/errata/RHSA-2026:56985)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 24.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._