PatchTheCEVCVE-2026-16956: IBM Db2 Mirror for i 7.4, 7.5, and 7.6 could allow a remote attacker to execute arbitrary commands due to impr
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CRITICAL 9.8REMOTEUPGRADE
CVE-2026-16956 is a critical-severity flaw (CVSS 9.8) affecting db2 mirror for i. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
IBM Db2 Mirror for i 7.4, 7.5, and 7.6 could allow a remote attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.
Why this priority
- Critical severity
- CISA SSVC: automatable with total technical impact
- 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 | 0.9% (top 42%) |
| CISA exploited list | No |
| Weakness | CWE-78 |
| Published | 2026-08-12 |
| Last modified | 2026-10-23 |
Publisher (CNA): IBM Corporation · Vendor: ibm
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
ibm db2 mirror for i UPGRADE
Affected: >= 7.4 and <= 7.6
Fixed in: newer than 7.6
Safe to downgrade to: a release before 7.4
1. Check installed version
apt-cache policy db2-mirror-for-i || rpm -q db2-mirror-for-i || db2-mirror-for-i --version
2. UPGRADE to newer than 7.6 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade db2-mirror-for-i
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade db2-mirror-for-i
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 7.4 (Debian / Ubuntu)
apt-cache madison db2-mirror-for-i
sudo apt install db2-mirror-for-i=<VERSION_BEFORE_7.4>
sudo apt-mark hold db2-mirror-for-i
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list db2-mirror-for-i
sudo dnf downgrade db2-mirror-for-i-<VERSION_BEFORE_7.4>
sudo dnf versionlock add db2-mirror-for-i
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.
Exact fixes by distribution
Fedora 46 · diffoscope · FIXED · 335-1.fc46 · FEDORA-2026-e4c4cc0856 · source
sudo dnf upgrade --advisory=FEDORA-2026-e4c4cc0856
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.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.