CVE-2026-34089: Vulnerability in Wikimedia Foundation Scribunto. This issue affects Scribunto: from 1.45.0 before 1.45.2.

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-34089 is a high-severity flaw (CVSS 7.5) affecting scribunto. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in Wikimedia Foundation Scribunto. This issue affects Scribunto: from 1.45.0 before 1.45.2.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-401, CWE-79
Published	2026-05-11
Last modified	2026-10-26

Publisher (CNA): wikimedia-foundation · Vendor: wikimedia

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 16:17 UTCPublished CVE record published
2026-10-26 00:10 UTCUpdated Record last modified

wikimedia scribunto UPGRADE

Affected: >= 1.45.0 and < 1.45.2

Fixed in: 1.45.2

Safe to downgrade to: a release before 1.45.0

1. Check installed version

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

2. UPGRADE to 1.45.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade scribunto

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 1.45.0 (Debian / Ubuntu)

apt-cache madison scribunto sudo apt install scribunto=<VERSION_BEFORE_1.45.0> sudo apt-mark hold scribunto

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

dnf --showduplicates list scribunto sudo dnf downgrade scribunto-<VERSION_BEFORE_1.45.0> sudo dnf versionlock add scribunto

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-2026-34089?

scribunto: upgrade to 1.45.2. Exact commands for each OS are on this page.

Is CVE-2026-34089 being exploited?

CVE-2026-34089 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-2026-34089 affect?

CVE-2026-34089 affects scribunto. Severity is high (CVSS 7.5). Vulnerability in Wikimedia Foundation Scribunto. This issue affects Scribunto: from 1.45.0 before 1.45.2.

How urgent is CVE-2026-34089?

Priority 43/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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