CVE-2026-18249: IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to gain elevated privileges due to im

Routine

HIGH 8.4MITIGATE

CVE-2026-18249 is a high-severity flaw (CVSS 8.4) affecting i. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to gain elevated privileges due to improper validation of pointers read from Java-controlled addresses.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.4 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-269
Published	2026-08-13
Last modified	2026-08-19

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-08-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-13 21:17 UTCPublished CVE record published
2026-08-19 16:37 UTCUpdated Record last modified

ibm i MITIGATE

Affected: 7.3 · 7.4 · 7.5 · 7.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-18249?

i: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-18249 being exploited?

CVE-2026-18249 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-18249 affect?

CVE-2026-18249 affects i. Severity is high (CVSS 8.4). IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to gain elevated privileges due to improper validation of pointers read from Java-controlled addresses.

How urgent is CVE-2026-18249?

Priority 38/100. High severity

Software pages

Java vulnerabilities

Related CVEs

CVE-2026-2311 MEDIUM 6.4 MITIGATE IBM i 7.6, 7.5, 7.4, 7.3, and 7.2 s vulnerable to privilege escalation caused by an invalid IBM i Web Administ
CVE-2026-7870 HIGH 8.8 MITIGATE IBM i 7.6, 7.5, 7.4, and 7.3 could allow a user to gain elevated privileges due to an unqualified library call
CVE-2026-9072 HIGH 8.1 UPGRADE IBM WebSphere Application Server and IBM WebSphere Application Server Liberty - when using Intelligent Managem
CVE-2026-10852 MEDIUM 5.9 MITIGATE IBM WebSphere Application Server and IBM WebSphere Application Server Liberty are vulnerable to denial of serv
CVE-2026-8858 HIGH 7.5 UPGRADE IBM WebSphere Application Server and IBM WebSphere Application Server Liberty are vulnerable to remote code ex

References

← Back to latest CVEs