CVE-2026-16340: IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-16340 is a critical-severity flaw (CVSS 9.8) affecting datapower gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.0.0 through 11.0.0.2 could allow a remote attacker to execute arbitrary code due to an out-of-bounds write in the RFC2047 encoded-word parser.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-10-08
Last modified	2026-10-15

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-08 13:17 UTCPublished CVE record published
2026-10-15 00:02 UTCUpdated Record last modified

ibm datapower gateway UPGRADE

Affected: >= 10.5.0.0 and < 10.5.0.23 · >= 10.6.0.0 and < 10.6.0.11 · >= 10.6.1.0 and < 11.0.0.3 · >= 11.0.0.0 and < 11.0.0.3

Fixed in: 10.5.0.23, 10.6.0.11, 11.0.0.3

Safe to downgrade to: a release before 10.5.0.0

1. Check installed version

apt-cache policy datapower-gateway || rpm -q datapower-gateway || datapower-gateway --version

2. UPGRADE to 10.5.0.23 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade datapower-gateway

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade datapower-gateway

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 10.5.0.0 (Debian / Ubuntu)

apt-cache madison datapower-gateway sudo apt install datapower-gateway=<VERSION_BEFORE_10.5.0.0> sudo apt-mark hold datapower-gateway

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

dnf --showduplicates list datapower-gateway sudo dnf downgrade datapower-gateway-<VERSION_BEFORE_10.5.0.0> sudo dnf versionlock add datapower-gateway

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-2026-16340?

datapower gateway: upgrade to 10.5.0.23, 10.6.0.11, 11.0.0.3. Exact commands for each OS are on this page.

Is CVE-2026-16340 being exploited?

CVE-2026-16340 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-2026-16340 affect?

CVE-2026-16340 affects datapower gateway. Severity is critical (CVSS 9.8). IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.0.0 through 11.0.0.2 could allow a remote attacker to execute arbitrary code due to an out-of-bounds write in the RFC2047 encoded-

How urgent is CVE-2026-16340?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-7366 MEDIUM 4.2 UPGRADE IBM DataPower Gateway 11.0.0.0 through 11.0.0.1 and IBM DataPower Gateway 10.5.0.0 through 10.5.0.21 and IBM D
CVE-2026-14905 HIGH 8.2 UPGRADE IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.
CVE-2026-14521 MEDIUM 4.9 UPGRADE IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.
CVE-2026-16169 HIGH 7.5 UPGRADE IBM DataPower Gateway 11.0.0.0 through 11.0.0.2 could allow a remote attacker to cause a denial of service due
CVE-2026-16170 HIGH 7.5 UPGRADE IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.

References

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