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Vulnerability details

CVE-2026-96512

Sudo: sudo: tz environment variable allows bypass of notbefore/notafter time-based authorization

CVSS 3.1
7.8High

Official description

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 scores

ScoreVersionSourceVector
7.8High 3.1 CVEProject cvelistV5 (CNA) (redhat) CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
No product information recorded.

References and advisories

20
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Details

Published
2026-09-23
Last updated
2026-10-29
State
Published
Assigner (CNA)
redhat

Exploit prediction (EPSS)

0.32%
Probability of exploitation in 30 days
25.2%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-863
    Incorrect Authorization