CVE-2026-34088 · cross-distro fix matrix

CVE-2026-34088: It was discovered that MediaWiki incorrectly handled group membership

Affects 6 Linux releases across 9 (distro × package) combinations. First disclosed: 2026-05-11.

CVSS v3:HIGH · 7.5(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-34088 has a known fix. Run the listed command on that distro to remediate.

Ubuntu focal

Source: Ubuntu USN

mediawiki→ fixed in1:1.31.7-1ubuntu0.1~esm1USN-8315-1
```
sudo apt-get install --only-upgrade -y mediawiki
```
mediawiki-classes→ fixed in1:1.31.7-1ubuntu0.1~esm1USN-8315-1
```
sudo apt-get install --only-upgrade -y mediawiki-classes
```

Ubuntu jammy

Source: Ubuntu USN

mediawiki→ fixed in1:1.35.6-1ubuntu0.1~esm1USN-8315-1
```
sudo apt-get install --only-upgrade -y mediawiki
```
mediawiki-classes→ fixed in1:1.35.6-1ubuntu0.1~esm1USN-8315-1
```
sudo apt-get install --only-upgrade -y mediawiki-classes
```

Ubuntu noble

Source: Ubuntu USN

mediawiki→ fixed in1:1.39.7-1ubuntu0.1~esm1USN-8315-1
```
sudo apt-get install --only-upgrade -y mediawiki
```
mediawiki-classes→ fixed in1:1.39.7-1ubuntu0.1~esm1USN-8315-1
```
sudo apt-get install --only-upgrade -y mediawiki-classes
```

Debian bullseye

Source: Debian Security Tracker

mediawiki→ fixed in1:1.35.13-1+deb11u7urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y mediawiki
```

Debian bookworm

Source: Debian Security Tracker

mediawiki→ fixed in1:1.39.17-1+deb12u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y mediawiki
```

Debian trixie

Source: Debian Security Tracker

mediawiki→ fixed in1:1.43.8+dfsg-1~deb13u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y mediawiki
```

Are YOU affected by CVE-2026-34088?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

CVE-2026-34088dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. From $9/mo, 14-day free trial, cancel anytime.

See StackPatch (from $9/mo)