PatchTheCVECVE-2026-10535: IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.4 is vulnerable to buffer overflow in setgid helper db2
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Routine
HIGH 8.4UPGRADE
CVE-2026-10535 is a high-severity flaw (CVSS 8.4) affecting db2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.4 is vulnerable to buffer overflow in setgid helper db2flacc.
Why this priority
- High severity
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.4 (High) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.2% (top 95%) |
| CISA exploited list | No |
| Weakness | CWE-121 |
| Published | 2026-07-30 |
| 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 UPGRADE
Affected: >= 11.5.0 and <= 11.5.9 · >= 12.1.0 and < 12.1.5
Fixed in: 12.1.5
Safe to downgrade to: a release before 11.5.0
1. Check installed version
apt-cache policy db2 || rpm -q db2 || db2 --version
2. UPGRADE to 12.1.5 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade db2
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade db2
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 11.5.0 (Debian / Ubuntu)
apt-cache madison db2
sudo apt install db2=<VERSION_BEFORE_11.5.0>
sudo apt-mark hold db2
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list db2
sudo dnf downgrade db2-<VERSION_BEFORE_11.5.0>
sudo dnf versionlock add db2
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.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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