CVE-2026-56101

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-08. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OpenBSD before commit 1ee99df contains an inverted comparison vulnerability in the ieee80211_michael_mic_failure() function within sys/net80211/ieee80211_crypto_tkip.c that allows unauthenticated attackers within RF range to trigger denial of service by sending two malformed TKIP frames separated by more than 60 seconds. Attackers can exploit the reversed TKIP MIC failure countermeasure window check to deauthenticate all associated TKIP stations and block reassociation for up to 90 seconds, while within-window MIC failures that should engage countermeasures are silently discarded, leaving key-recovery attempts undetected.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity53% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 10, 2026

Advisory Details (3)

Auto-updated Sep 8, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

OpenBSD ieee80211_crypto_tkip.c TKIP MIC Countermeasure Logic Inversion DoS | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openbsd-ieee80211-crypto-tkip-c-tkip-mic-countermeasure-logic-inversion-dos
github_commit

commit 1ee99dfcc4dd (openbsd/src)

Fix landed in openbsd/src commit 1ee99dfcc4dd — awaiting tagged release

https://github.com/openbsd/src/commit/1ee99dfcc4ddc87afc6395d5d3094e9d2314fb5a
generic

OpenBSD - Inverted TKIP MIC-Failure Countermeasure Condition · Argus Proof of Possession

https://pop.argus-systems.ai/advisory/adv-209.html

Vendor Advisories for CVE-2026-56101(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 35× 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. 2026-09-18 22:53 UTCEG score recompute
  2. 2026-09-18 22:53 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 00:55 UTCEG score recompute
  5. 2026-09-18 00:55 UTCGHSA enrichment
  6. 2026-09-17 19:31 UTCEPSS rescore
  7. 2026-09-17 02:57 UTCEG score recompute
  8. 2026-09-17 02:57 UTCGHSA enrichment
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-16 04:25 UTCGHSA enrichment
  12. 2026-09-15 06:14 UTCEG score recompute
  13. 2026-09-15 06:14 UTCGHSA enrichment
  14. 2026-09-15 03:11 UTCEPSS rescore
  15. 2026-09-14 08:16 UTCEG score recompute
  16. 2026-09-14 08:16 UTCGHSA enrichment
  17. 2026-09-13 16:47 UTCEPSS rescore
  18. 2026-09-13 10:18 UTCEG score recompute
  19. 2026-09-13 10:18 UTCGHSA enrichment
  20. 2026-09-12 12:20 UTCEG score recompute
  21. 2026-09-12 12:20 UTCGHSA enrichment
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-11 14:22 UTCEG score recompute
  24. 2026-09-11 14:22 UTCGHSA enrichment
  25. 2026-09-10 16:24 UTCEG score recompute
Show 10 more
  1. 2026-09-10 16:24 UTCGHSA enrichment
  2. 2026-09-10 15:26 UTCEG score recompute
  3. 2026-09-10 15:26 UTCGHSA enrichment
  4. 2026-09-10 09:35 UTCEPSS rescore
  5. 2026-09-09 18:10 UTCGHSA enrichment
  6. 2026-09-08 20:11 UTCEG score recompute
  7. 2026-09-08 20:11 UTCGHSA enrichment
  8. 2026-09-08 16:38 UTCEG score recompute
  9. 2026-09-08 16:07 UTCEG score recompute
  10. 2026-09-08 16:04 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56101?
CVE-2026-56101 is a medium vulnerability published on September 8, 2026. OpenBSD before commit 1ee99df contains an inverted comparison vulnerability in the ieee80211michaelmicfailure() function within sys/net80211/ieee80211crypto_tkip.c that allows unauthenticated attackers within RF range to trigger denial of service by sending two malformed TKIP frames separated by…
When was CVE-2026-56101 disclosed?
CVE-2026-56101 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56101 actively exploited?
CVE-2026-56101 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 65.9% of all scored CVEs.
What is the CVSS score of CVE-2026-56101?
CVE-2026-56101 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-56101?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56101, 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

Explore the affected products and dependency analysis for CVE-2026-56101

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