CVE-2026-96512

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-23. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, ghsa
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 7.8Exploit: None knownExposed: 0

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

A flaw was found in sudo. When sudoers rules use NOTBEFORE or NOTAFTER time-based access restrictions with timestamps that omit the trailing 'Z' timezone indicator, the time evaluation relies on the TZ environment variable inherited from the calling user. Because sudo is a setuid-root program, an unprivileged local user can set TZ to an extreme timezone offset to shift the authorization window by up to approximately 25 hours, causing expired rules to be treated as valid. This allows the user to execute commands outside the intended time window. Authentication is not bypassed; only the time-based authorization check is affected.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

September 23, 2026

Last Modified

September 24, 2026

Advisory Details (3)

Auto-updated Sep 23, 2026
Patch available. Sources: redhat, github_commit.
github_commit

commit 1820a3496875 (sudo-project/sudo)

Fix landed in sudo-project/sudo commit 1820a3496875 — awaiting tagged release

https://github.com/sudo-project/sudo/commit/1820a349687522f51023d1ae5925125f59679a8c
redhat

2539327 – (CVE-2026-96512) CVE-2026-96512 sudo: sudo: TZ environment variable allows bypass of NOTBEFORE/NOTAFTER time-based authorization

https://bugzilla.redhat.com/show_bug.cgi?id=2539327
redhat Patch Available

CVE-2026-96512 - 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-2026-96512

Vendor Advisories for CVE-2026-96512(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 11× in last 7d / 11× 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. 2026-09-24 04:02 UTCEG score recompute
  2. 2026-09-24 04:02 UTCGHSA enrichment
  3. 2026-09-23 19:48 UTCGHSA enrichment
  4. 2026-09-23 17:19 UTCEG score recompute
  5. 2026-09-23 17:19 UTCGHSA enrichment
  6. 2026-09-23 16:24 UTCEG score recompute
  7. 2026-09-23 16:24 UTCGHSA enrichment
  8. 2026-09-23 15:36 UTCEG score recompute
  9. 2026-09-23 15:36 UTCGHSA enrichment
  10. 2026-09-23 13:35 UTCEG score recompute
  11. 2026-09-23 13:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-96512?
CVE-2026-96512 is a high vulnerability published on September 23, 2026. A flaw was found in sudo. When sudoers rules use NOTBEFORE or NOTAFTER time-based access restrictions with timestamps that omit the trailing 'Z' timezone indicator, the time evaluation relies on the TZ environment variable inherited from the calling user. Because sudo is a setuid-root program, an…
When was CVE-2026-96512 disclosed?
CVE-2026-96512 was first published in the National Vulnerability Database on September 23, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-96512?
CVE-2026-96512 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-96512?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-96512, 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-2026-96512

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