{"id":"CVE-2026-71225","title":"A flaw was found in libkcapi","summary":"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 Vec…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-330"],"vendor":"redhat","product":"hardened_images","affected":["hardened_images","openshift_container_platform = 4.0","libkcapi >= 0.10.1, < 1.5.1","enterprise_linux = 8.0","enterprise_linux = 9.0","enterprise_linux = 10.0"],"patched":["libkcapi 1.5.1"],"published":"2026-08-05","updated":"2026-09-21","sourceUpdated":"2026-09-21T13:17:09.720","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71225","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:56985","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:67265","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:67266","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:67267","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:69285","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-71225","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2462011","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71225.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-71225"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71225"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-05T14:20:51.007088Z"},"epss":0.0033,"epssPercentile":0.26262,"ingestedAt":"2026-08-10T09:39:29.627Z","slug":"CVE-2026-71225","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `hardened_images`\n- `openshift_container_platform = 4.0`\n- `libkcapi >= 0.10.1, < 1.5.1`\n- `enterprise_linux = 8.0`\n- `enterprise_linux = 9.0`\n- `enterprise_linux = 10.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libkcapi 1.5.1`\n\n## Vendor advisories\n\n- **RHSA-2026:67267** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67267)\n- **RHSA-2026:67266** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67266)\n- **RHSA-2026:67265** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67265)\n- **RHSA-2026:56985** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56985)\n- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71225.json)\n- **RHSA-2026:69285** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS EUS (v. 10.0) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69285)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}