CVE-2026-71225

MEDIUMNVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-05. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — Patch released this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 19, 2026

Advisory Details (2)

Auto-updated Aug 5, 2026
Patch available. Sources: redhat.
redhat

2462011 – (CVE-2026-71225) CVE-2026-71225 libkcapi: IV reuse in libkcapi one-shot symmetric cipher chunking causes cipher state reset across chunk boundaries

https://bugzilla.redhat.com/show_bug.cgi?id=2462011
redhat Patch Available

CVE-2026-71225 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-71225

Vendor Advisories for CVE-2026-71225(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatlibkcapi-main-1.5.1-0.1.hum12026-08-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libkcapi1.2.1-1 ... 1.4.0-1 (6 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libkcapi1.4.0-1——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libkcapi1.4.0-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libkcapi1.4.0-1——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 25× in last 7d / 56× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 19:39 UTCVendor advisory
  3. 2026-08-20 19:39 UTCGHSA enrichment
  4. 2026-08-19 21:21 UTCEG score recompute
  5. 2026-08-19 21:21 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 04:42 UTCEG score recompute
  8. 2026-08-19 04:42 UTCGHSA enrichment
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 06:23 UTCEG score recompute
  12. 2026-08-18 06:23 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 08:05 UTCEG score recompute
  15. 2026-08-17 08:05 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 09:47 UTCEG score recompute
  19. 2026-08-16 09:47 UTCGHSA enrichment
  20. 2026-08-16 02:15 UTCEPSS rescore
  21. 2026-08-15 11:30 UTCEG score recompute
  22. 2026-08-15 11:30 UTCGHSA enrichment
  23. 2026-08-15 01:31 UTCEPSS rescore
  24. 2026-08-14 13:12 UTCEG score recompute
  25. 2026-08-14 13:12 UTCGHSA enrichment
Show 31 more
  1. 2026-08-13 22:00 UTCEPSS rescore
  2. 2026-08-13 14:54 UTCGHSA enrichment
  3. 2026-08-12 16:36 UTCEG score recompute
  4. 2026-08-12 16:36 UTCGHSA enrichment
  5. 2026-08-12 13:51 UTCEPSS rescore
  6. 2026-08-11 18:16 UTCEG score recompute
  7. 2026-08-11 18:16 UTCGHSA enrichment
  8. 2026-08-11 07:37 UTCEG score recompute
  9. 2026-08-11 07:37 UTCGHSA enrichment
  10. 2026-08-11 00:00 UTCEPSS rescore
  11. 2026-08-10 09:20 UTCEG score recompute
  12. 2026-08-10 09:20 UTCGHSA enrichment
  13. 2026-08-10 08:56 UTCEG score recompute
  14. 2026-08-10 08:56 UTCGHSA enrichment
  15. 2026-08-09 13:47 UTCEPSS rescore
  16. 2026-08-09 10:42 UTCEG score recompute
  17. 2026-08-09 10:42 UTCGHSA enrichment
  18. 2026-08-08 16:37 UTCEPSS rescore
  19. 2026-08-08 12:25 UTCEG score recompute
  20. 2026-08-08 12:25 UTCGHSA enrichment
  21. 2026-08-07 14:07 UTCGHSA enrichment
  22. 2026-08-06 15:49 UTCEG score recompute
  23. 2026-08-06 15:49 UTCGHSA enrichment
  24. 2026-08-06 13:47 UTCEPSS rescore
  25. 2026-08-06 13:45 UTCEG score recompute
  26. 2026-08-06 13:45 UTCGHSA enrichment
  27. 2026-08-05 15:27 UTCEG score recompute
  28. 2026-08-05 14:37 UTCEG score recompute
  29. 2026-08-05 13:28 UTCEG score recompute
  30. 2026-08-05 12:31 UTCEG score recompute
  31. 2026-08-05 12:31 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-71225?
CVE-2026-71225 is a medium vulnerability published on August 5, 2026. 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…
When was CVE-2026-71225 disclosed?
CVE-2026-71225 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71225 actively exploited?
CVE-2026-71225 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 77.2% of all scored CVEs.
What is the CVSS score of CVE-2026-71225?
CVE-2026-71225 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-71225?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71225, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-71225

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