HighCVE-2026-35535

Sudo: Privilege Dropping / Lowering Errors (CVE-2026-35535)

Published 03.04.2026Last modified 01.09.2026Sources: Red Hat, BSI, Siemens ProductCERT, CVE.org, Debian LTS, Msrc Update Guide

What is affected, what to do

A flaw was found in Sudo. A local user could exploit a failure in the setuid, setgid, or setgroups calls, which are used to drop privileges before running the mailer.

The available sources name no fixed version. Check the vendor guidance in the references below.

Conflicting version data — version display is hidden until the data is resolved.

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

7.8

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

7.4

CVSS v3

Severity High on the scale from 0 to 10.

Source: Red Hat, BSI, Siemens ProductCERT, CVE.org, Debian LTS, Msrc Update Guide

0.2 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 7.2

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 53.13 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 7.8 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 7.4
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.2 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 7.2; Low — this CVE sits in the lower 10% of all CVEs scored today.
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 03.04.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 3 April 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-271

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

A flaw was found in Sudo. A local user could exploit a failure in the setuid, setgid, or setgroups calls, which are used to drop privileges before running the mailer. This oversight allows for privilege escalation, enabling the user to gain elevated access on the system.

Source: redhat_csaf, BSI WID Portal, BSI CSAF, siemens_advisory, cvelistv5, Debian LTS Advisories, Microsoft Security Update Guide, NVD (NIST), CVE.org (MITRE)

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Sudo project	Sudo	`—`	—
sudo_project	sudo	`< 1.9.17` `1.9.17`	`1.9.17` —
IBM	QRadar SIEM	`<7.5.0 UP15 IF03`	—
Meinberg	LANTIME	`< V7.10.014`	`V7.10.014`
Microsoft	Azure Linux	`azl3`	—
Red Hat	Enterprise Linux	`Update Infrastructure 5.1`	—
Red Hat	OpenShift Container Platform	`< 4.19.32`	`4.19.32`

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	sudo	`bullseye`
Other	siemens	sinec_os	—

Weakness classes (CWE)

CWE-271Privilege Dropping / Lowering Errors
Class
The product does not drop privileges before passing control of a resource to an actor that does not have those privileges.
Entry at MITRE CWE-271

References & sources

github.comsudo-project/sudo/commit/3e474c2f201484be83d994ae10a4e20e8c81bb…
qualys.com2026/03/10/crack-armor.txt
bugs.launchpad.netubuntu/+source/sudo/+bug/2143042
bugs.debian.org1130593
Siemens ProductCERTproductcert/html/ssa-253495.html
lists.debian.orgdebian-lts-announce/2026/06/msg00003.html
access.redhat.comsecurity/cve/CVE-2026-35535Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2454714Issue tracking, x_refsource_REDHAT
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-35535.jsonx_sadp-csaf-vex
access.redhat.comerrata/RHSA-2026:13896Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:13895Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:21695Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:21690Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:28887Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:23233Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:20087Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:34098Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:21656Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:20040Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:13888Vendor advisory, x_refsource_REDHAT

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

01.09.2026Record modifiedMITRE

New references:

Show 12 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://bugs.debian.org/1130593
Reference	added	—	https://bugs.launchpad.net/ubuntu/+source/sudo/+bug/2143042
Reference	added	—	https://github.com/sudo-project/sudo/commit/3e474c2f201484be83d994ae10a4e20e8c81bb69
Reference	added	—	https://www.qualys.com/2026/03/10/crack-armor.txt
Reference	removed	https://bugs.debian.org/1130593	—
Reference	removed	https://bugs.launchpad.net/ubuntu/+source/sudo/+bug/2143042	—
Reference	removed	https://github.com/sudo-project/sudo/commit/3e474c2f201484be83d994ae10a4e20e8c81bb69	—
Reference	removed	https://www.qualys.com/2026/03/10/crack-armor.txt	—
Reference type	removed	https://bugs.debian.org/1130593 Types: Broken Link	—
Reference type	removed	https://bugs.launchpad.net/ubuntu/+source/sudo/+bug/2143042 Types: Issue Tracking	—
Reference type	removed	https://github.com/sudo-project/sudo/commit/3e474c2f201484be83d994ae10a4e20e8c81bb69 Types: Patch	—
Reference type	removed	https://www.qualys.com/2026/03/10/crack-armor.txt Types: Third Party Advisory	—

Source identifier: cve@mitre.org

01.09.2026Record modifiedCVE Program

New references:

https://lists.debian.org/debian-lts-announce/2026/06/msg00003.html

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://lists.debian.org/debian-lts-announce/2026/06/msg00003.html
Reference	removed	https://lists.debian.org/debian-lts-announce/2026/06/msg00003.html	—

Source identifier: af854a3a-2127-422b-91ae-364da2661108

01.09.2026Record modifiedRed Hat ADP

New references:

and 8 more references

Show 57 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/35xxx/CVE-2026-35535.json">CVE-2026-35535</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:10758
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:11521
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:12310
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:13731
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:13888
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:13889
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:13891
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:13892
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:13895
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:13896
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:14228
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:14437
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:19067
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:19220
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:20040
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:20087
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:21275
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:21656
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:21690
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:21695
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:23233
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:28887
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:30088
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:34098
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:58981
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-35535
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2454714
Reference	added	—	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35535.json
Reference	removed	https://access.redhat.com/errata/RHSA-2026:10758	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:11521	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:12310	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:13731	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:13888	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:13889	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:13891	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:13892	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:13895	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:13896	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:14228	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:14437	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:19067	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:19220	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:20040	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:20087	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:21275	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:21656	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:21690	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:21695	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:23233	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:28887	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:30088	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:34098	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:58981	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-35535	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2454714	—
Reference	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35535.json	—

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

01.09.2026Record modifiedSiemens ADP

New references:

https://cert-portal.siemens.com/productcert/html/ssa-253495.html

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://cert-portal.siemens.com/productcert/html/ssa-253495.html
Reference	removed	https://cert-portal.siemens.com/productcert/html/ssa-253495.html	—
Reference type	removed	https://cert-portal.siemens.com/productcert/html/ssa-253495.html Types: Third Party Advisory	—

Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

25.08.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:58981

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:58981
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION (+23)	Red Hat Update Infrastructure 5, Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION), Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) (+31)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

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<a href="https://intel.neosec.eu/en/cve/CVE-2026-35535"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-35535.svg?lang=en" alt="CVE-2026-35535 – NEOSEC Intel" height="20"></a>