CVE-2026-18544: IBM Portieris 0.5.0 through 0.14.2 could allow a remote authenticated attacker to bypass image policy enforcem

Routine

HIGH 8.1UPGRADE

CVE-2026-18544 is a high-severity flaw (CVSS 8.1) affecting portieris. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM Portieris 0.5.0 through 0.14.2 could allow a remote authenticated attacker to bypass image policy enforcement due to improper authorization of pod owner references.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-08-19
Last modified	2026-09-02

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-09-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-19 21:16 UTCPublished CVE record published
2026-09-02 18:59 UTCUpdated Record last modified

ibm portieris UPGRADE

Affected: >= 0.5.0 and < 0.14.3

Fixed in: 0.14.3

Safe to downgrade to: a release before 0.5.0

1. Check installed version

apt-cache policy portieris || rpm -q portieris || portieris --version

2. UPGRADE to 0.14.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade portieris

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade portieris

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.5.0 (Debian / Ubuntu)

apt-cache madison portieris sudo apt install portieris=<VERSION_BEFORE_0.5.0> sudo apt-mark hold portieris

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list portieris sudo dnf downgrade portieris-<VERSION_BEFORE_0.5.0> sudo dnf versionlock add portieris

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-18544?

portieris: upgrade to 0.14.3. Exact commands for each OS are on this page.

Is CVE-2026-18544 being exploited?

CVE-2026-18544 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-2026-18544 affect?

CVE-2026-18544 affects portieris. Severity is high (CVSS 8.1). IBM Portieris 0.5.0 through 0.14.2 could allow a remote authenticated attacker to bypass image policy enforcement due to improper authorization of pod owner references.

How urgent is CVE-2026-18544?

Priority 38/100. High severity

References

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