VulnSocial

CVE-2026-96512

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

Back to dashboard
0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-863

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • 1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-09-23: 109-23
Full discourse1 post
  • Upwind Security MDR@UpwindMDR

    🚨High - sudoers NOTBEFORE/NOTAFTER TZ Time Window Bypass (CVE-2026-96512) In sudo, sudoers rules using NOTBEFORE/NOTAFTER with timestamps missing the trailing 'Z' are evaluated using the caller-controlled TZ environment variable. A local user can shift time checks by ~25 hours so expired/invalid windows are treated as valid, enabling command execution outside the intended window (no auth bypass). Rules with 'Z' are not affected. 👉Affected: sudo (sudoers NOTBEFORE/NOTAFTER timestamps without trailing 'Z')

    0000057
    305 followersView on X

Explore more

Back to dashboard