Skip to content
Noroxi
CVE-2026-96512· NVD / CVE Program· CNA redhat

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

Noroxi assessment

Priority: Monitor (action score 31/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.14% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: azl3 libical 3.0.10-1 on Azure Linux 3.0 1.9.17-4.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to azl3 libical 3.0.10-1 on Azure Linux 3.0 1.9.17-4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—Proof of concept Fix available
Published
Sep 23, 2026
Updated
Oct 22, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-96512

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for red hat records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • 0:1.9.17-10.p2.el10_2.7 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

    • 0:1.9.15-8.p5.el10_0.5 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • 0:1.9.5p2-2.el8_10 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service

    • 0:1.9.5p2-1.el8_8.4 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

    • 0:1.9.5p2-1.el8_8.4 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

    • 0:1.9.17p2-3.el9_8.3 and laternot affected · rpm
    • 0:1.9.17p2-3.el9_8.3 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

    • 0:1.9.5p2-10.el9_4.4 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support

    • 0:1.9.5p2-10.el9_6.4 and laternot affected · rpm

  • Red Hat Red Hat Hardened Images

    • 1.9.17-16.p2.2.hum1 and laternot affected · rpm

  • Red Hat Red Hat Update Infrastructure 5

    • 1791964013 and laternot affected · rpm
    • 1791978693 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10sudobefore 1.9.17-10.p2.el10_2.71.9.17-10.p2.el10_2.7
AlmaLinux:10sudo-python-pluginbefore 1.9.17-10.p2.el10_2.71.9.17-10.p2.el10_2.7
AlmaLinux:8sudobefore 1.9.5p2-2.el8_101.9.5p2-2.el8_10
AlmaLinux:9sudobefore 1.9.17p2-3.el9_8.31.9.17p2-3.el9_8.3
AlmaLinux:9sudo-python-pluginbefore 1.9.17p2-3.el9_8.31.9.17p2-3.el9_8.3
Debian:12sudofrom 0—
Debian:14sudobefore 1.9.17p2-91.9.17p2-9
Red Hat:enterprise_linux:10.2sudobefore 0:1.9.17-10.p2.el10_2.70:1.9.17-10.p2.el10_2.7
Red Hat:enterprise_linux:10.2sudo-debuginfobefore 0:1.9.17-10.p2.el10_2.70:1.9.17-10.p2.el10_2.7
Red Hat:enterprise_linux:10.2sudo-debugsourcebefore 0:1.9.17-10.p2.el10_2.70:1.9.17-10.p2.el10_2.7
Red Hat:enterprise_linux:10.2sudo-python-pluginbefore 0:1.9.17-10.p2.el10_2.70:1.9.17-10.p2.el10_2.7
Red Hat:enterprise_linux:10.2sudo-python-plugin-debuginfobefore 0:1.9.17-10.p2.el10_2.70:1.9.17-10.p2.el10_2.7
Red Hat:enterprise_linux:8::baseossudobefore 0:1.9.5p2-2.el8_100:1.9.5p2-2.el8_10
Red Hat:enterprise_linux:8::baseossudo-debuginfobefore 0:1.9.5p2-2.el8_100:1.9.5p2-2.el8_10
Red Hat:enterprise_linux:8::baseossudo-debugsourcebefore 0:1.9.5p2-2.el8_100:1.9.5p2-2.el8_10
Red Hat:enterprise_linux:9::appstreamsudo-debuginfobefore 0:1.9.17p2-3.el9_8.30:1.9.17p2-3.el9_8.3
Red Hat:enterprise_linux:9::appstreamsudo-debugsourcebefore 0:1.9.17p2-3.el9_8.30:1.9.17p2-3.el9_8.3
Red Hat:enterprise_linux:9::appstreamsudo-python-pluginbefore 0:1.9.17p2-3.el9_8.30:1.9.17p2-3.el9_8.3
Red Hat:enterprise_linux:9::appstreamsudo-python-plugin-debuginfobefore 0:1.9.17p2-3.el9_8.30:1.9.17p2-3.el9_8.3
Red Hat:enterprise_linux:9::baseossudobefore 0:1.9.17p2-3.el9_8.30:1.9.17p2-3.el9_8.3
Red Hat:hummingbird:1sudobefore 0:1.9.17-16.p2.2.hum10:1.9.17-16.p2.2.hum1
Red Hat:hummingbird:1sudo-develbefore 0:1.9.17-16.p2.2.hum10:1.9.17-16.p2.2.hum1
Red Hat:hummingbird:1sudo-logsrvdbefore 0:1.9.17-16.p2.2.hum10:1.9.17-16.p2.2.hum1
Red Hat:hummingbird:1sudo-python-pluginbefore 0:1.9.17-16.p2.2.hum10:1.9.17-16.p2.2.hum1

+3

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-90954Busybox: busybox: dpkg-deb extraction-root escape via per-ar-member deferred symlink flush
    31Monitor
  • CVE-2026-78410Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection
    31Monitor
  • CVE-2026-78408Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-88837Sep 23, 2026 · Busybox: busybox: httpd misidentifies yescrypt password hashes as plaintext, inverting authentication
    26Monitor
  • ← EarlierCVE-2026-88839Sep 23, 2026 · Busybox: busybox: passwd/group parser writes heap pointers out of bounds due to stale tokenize() endpoint
    26Monitor
  • Later →CVE-2026-88840Sep 23, 2026 · Busybox: busybox: tls ssl_server reads one byte out of bounds when parsing truncated clienthello
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 libical 3.0.10-1 on Azure Linux 3.01.9.17-4 · Release NotesMicrosoft (MSRC)
almalinux:sudo1.9.17p2-3.el9_8.3 · AlmaLinux:9Package registry (OSV)
almalinux:sudo-python-plugin1.9.17p2-3.el9_8.3 · AlmaLinux:9Package registry (OSV)
debian:sudo1.9.17p2-9 · Debian:14Package registry (OSV)
red hat:sudo0:1.9.17-16.p2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:sudo-debuginfo0:1.9.17-10.p2.el10_2.7 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:sudo-debuginfo0:1.9.17p2-3.el9_8.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:sudo-debugsource0:1.9.17-10.p2.el10_2.7 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:sudo-debugsource0:1.9.17p2-3.el9_8.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:sudo-devel0:1.9.17-16.p2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:sudo-logsrvd0:1.9.17-16.p2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:sudo-python-plugin0:1.9.17-16.p2.2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:sudo-python-plugin-debuginfo0:1.9.17-10.p2.el10_2.7 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:sudo-python-plugin-debuginfo0:1.9.17p2-3.el9_8.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:sudo0:1.9.17p2-3.el9_8.3 · Rocky Linux:9Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-09-25
Proof-of-concept repository on GitHubstars:02026-09-25

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+1 d
  3. TodayOct 25, 2026+32 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-863 · Incorrect Authorization

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (12 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records