CVE-2026-91837

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-25. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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: 0.1%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in NetworkManager-iodine, the iodine VPN plugin for NetworkManager. A local unprivileged user can exploit a vulnerability in how the 'nameserver' setting is processed when establishing an iodine VPN connection. By embedding shell metacharacters (special characters that can execute commands) in the 'nameserver' value, an attacker can inject and execute arbitrary commands. These commands run with root privileges before the application drops its elevated permissions, leading to local privilege escalation.

CVSS v3
7.8
EG Score
7.8HIGHhigh confidence
EG Risk
35
EG Risk 35/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 25, 2026

Last Modified

September 30, 2026

Advisory Details (3)

Auto-updated Sep 25, 2026
Patch available. Sources: redhat.
generic

(CVE-2026-91837) Option confusion reaches iodine's pre-drop root shell (#4) · Tickets · GNOME / network-manager-iodine · GitLab

https://gitlab.gnome.org/GNOME/network-manager-iodine/-/work_items/4
redhat

2533634 – (CVE-2026-91837) CVE-2026-91837 NetworkManager-iodine: NetworkManager-iodine: local privilege escalation to root via nameserver option injection

https://bugzilla.redhat.com/show_bug.cgi?id=2533634
redhat Patch Available

CVE-2026-91837 - 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-2026-91837

Vendor Advisories for CVE-2026-91837(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 28× in last 7d / 38× 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. 2026-10-04 05:09 UTCGHSA enrichment
  2. 2026-10-03 17:34 UTCEG score recompute
  3. 2026-10-03 17:34 UTCGHSA enrichment
  4. 2026-10-03 05:59 UTCGHSA enrichment
  5. 2026-10-02 18:24 UTCEG score recompute
  6. 2026-10-02 18:24 UTCGHSA enrichment
  7. 2026-10-02 06:49 UTCEG score recompute
  8. 2026-10-02 06:49 UTCGHSA enrichment
  9. 2026-10-01 19:51 UTCEPSS rescore
  10. 2026-10-01 19:14 UTCGHSA enrichment
  11. 2026-10-01 07:36 UTCGHSA enrichment
  12. 2026-09-30 20:02 UTCEG score recompute
  13. 2026-09-30 20:02 UTCGHSA enrichment
  14. 2026-09-30 15:04 UTCEPSS rescore
  15. 2026-09-30 13:39 UTCGHSA enrichment
  16. 2026-09-30 02:04 UTCEG score recompute
  17. 2026-09-30 02:04 UTCGHSA enrichment
  18. 2026-09-29 14:29 UTCGHSA enrichment
  19. 2026-09-29 02:52 UTCEG score recompute
  20. 2026-09-29 02:52 UTCGHSA enrichment
  21. 2026-09-28 15:17 UTCEG score recompute
  22. 2026-09-28 15:17 UTCGHSA enrichment
  23. 2026-09-28 13:52 UTCEPSS rescore
  24. 2026-09-28 13:52 UTCEPSS rescore
  25. 2026-09-28 03:41 UTCGHSA enrichment
Show 13 more
  1. 2026-09-27 16:04 UTCEG score recompute
  2. 2026-09-27 16:04 UTCGHSA enrichment
  3. 2026-09-27 13:49 UTCEPSS rescore
  4. 2026-09-27 04:29 UTCGHSA enrichment
  5. 2026-09-26 16:52 UTCEG score recompute
  6. 2026-09-26 16:52 UTCGHSA enrichment
  7. 2026-09-26 15:59 UTCEPSS rescore
  8. 2026-09-26 05:17 UTCEG score recompute
  9. 2026-09-26 05:17 UTCGHSA enrichment
  10. 2026-09-25 17:37 UTCEG score recompute
  11. 2026-09-25 16:50 UTCEG score recompute
  12. 2026-09-25 16:24 UTCEG score recompute
  13. 2026-09-25 16:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91837?
CVE-2026-91837 is a high vulnerability published on September 25, 2026. A flaw was found in NetworkManager-iodine, the iodine VPN plugin for NetworkManager. A local unprivileged user can exploit a vulnerability in how the 'nameserver' setting is processed when establishing an iodine VPN connection. By embedding shell metacharacters (special characters that can execute…
When was CVE-2026-91837 disclosed?
CVE-2026-91837 was first published on September 25, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91837 actively exploited?
CVE-2026-91837 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-91837?
CVE-2026-91837 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-91837?
A fix for CVE-2026-91837 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-91837 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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