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CVE-2026-18835

IBM Aix command injection

9.9 CRITICALEPSS 0.79%
  1. Published20 Aug 2026

Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

IBM Vios≥ 4.1.0 < 4.1.0.50 · ≥ 4.1.1.0 < 4.1.1.30 · ≥ 4.1.2.0 < 4.1.2.20
IBM Aix≥ 7.2.5 ≤ 7.2.5.212 · ≥ 7.3.2 ≤ 7.3.2.5 · ≥ 7.3.3 ≤ 7.3.3.2 · ≥ 7.3.4 ≤ 7.3.4.1

Remediation

Fixed in
IBM Vios≥ 4.1.0.50

References

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Frequently asked

Is CVE-2026-18835 being actively exploited?

CVE-2026-18835 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.79%.

How severe is CVE-2026-18835?

CVE-2026-18835 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.79% probability of exploitation.

Which products are affected by CVE-2026-18835?

Affected products include IBM Vios, IBM Aix.

How do I fix CVE-2026-18835?

Upgrade affected software to a fixed version, for example IBM Vios 4.1.0.50 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-18835 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.