Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-71225

CVE-2026-71225MEDIUM

Stephan Muelle libkcapi — Libkcapi: iv reuse in libkcapi one-shot symmetric cipher chunking causes cipher state reset across chunk boundaries

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   N  U  H  L  N    6.5   .0052   42.2     —

AFFECTED
  Product                                                Versions     Fixed
  libkcapi                                               0.10.1 –     —
  Red Hat Enterprise Linux 10                            unspecified  0:1.5.1-1.el10_2
  Red Hat Enterprise Linux 10.0 Extended Update Support  unspecified  0:1.5.0-6.el10_0
  Red Hat Enterprise Linux 8                             unspecified  0:1.4.0-3.el8_10
  Red Hat Enterprise Linux 9                             unspecified  0:1.4.0-3.el9_8
  Red Hat Hardened Images                                unspecified  1.5.1-0.1.hum1
  Red Hat OpenShift Container Platform 4                 unspecified  —
  Red Hat OpenShift Container Platform 4                 unspecified  —

TIMELINE
  Aug 5   EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
  Aug 5   Reserved by redhat
  Aug 5   Published (CNA: redhat)
  Aug 11  EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
  Aug 19  EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
  Aug 19  PATCH SHIPPED — CVE-2026-71225 (Stephan Muelle libkcapi). Fixed in Red Hat Hardened Images 1.5.1-0.1.hum1.
  Aug 25  EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
  Aug 31  EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
  Sep 1   EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
  Sep 14  EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
  Sep 21  EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.

CWE-330 · CNA: redhat · CVSS v3.1 · 7 references · NVD status: Modified

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.

Lifecycle

Complete event history — 11 events, chronological
Date	Event	Detail
August 5, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
August 5, 2026	Reserved	Reserved by redhat
August 5, 2026	Published	Published (CNA: redhat)
August 11, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
August 19, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
August 19, 2026	PATCH SHIPPED	PATCH SHIPPED — CVE-2026-71225 (Stephan Muelle libkcapi). Fixed in Red Hat Hardened Images 1.5.1-0.1.hum1.
August 25, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
August 31, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
September 1, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
September 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.
September 21, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-71225 (Stephan Muelle libkcapi). Public exploit reference added.

Affected

Affected products and packages — 8 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Stephan Muelle	libkcapi	—	0.10.1	—
Red Hat	Red Hat Enterprise Linux 10	—	—	0:1.5.1-1.el10_2
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	—	—	0:1.5.0-6.el10_0
Red Hat	Red Hat Enterprise Linux 8	—	—	0:1.4.0-3.el8_10
Red Hat	Red Hat Enterprise Linux 9	—	—	0:1.4.0-3.el9_8
Red Hat	Red Hat Hardened Images	—	—	1.5.1-0.1.hum1
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—

Weaknesses

CWE-330

References (7)

https://access.redhat.com/errata/RHSA-2026:56985
https://access.redhat.com/errata/RHSA-2026:67265
https://access.redhat.com/errata/RHSA-2026:67266
https://access.redhat.com/errata/RHSA-2026:67267
https://access.redhat.com/errata/RHSA-2026:69285
https://access.redhat.com/security/cve/CVE-2026-71225 [Vendor Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=2462011 [Exploit, Issue Tracking, Vendor Advisory]

Authoritative record: CVE-2026-71225 at cve.org

Vendors: stephan muelle · red hat

Weaknesses: CWE-330

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-71225 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.