CVE-2023-40034: Woodpecker is a community fork of the Drone CI system

This month

HIGH 8.1REMOTEUPGRADE

CVE-2023-40034 is a high-severity flaw (CVSS 8.1) affecting woodpecker. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Woodpecker is a community fork of the Drone CI system. In affected versions an attacker can post malformed webhook data witch lead to an update of the repository data that can e.g. allow the takeover of an repo. This is only critical if the CI is configured for public usage and connected to a forge witch is also in public usage. This issue has been addressed in version 1.0.2. Users are advised to upgrade. Users unable to upgrade should secure the

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-20
Published	2023-08-16
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: woodpecker-ci

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-08-16 21:15 UTCPublished CVE record published
2026-06-17 06:15 UTCUpdated Record last modified

woodpecker-ci woodpecker UPGRADE

Affected: >= 1.0.0 and < 1.0.2

Fixed in: 1.0.2

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. UPGRADE to 1.0.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade woodpecker

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 1.0.0 (Debian / Ubuntu)

apt-cache madison woodpecker sudo apt install woodpecker=<VERSION_BEFORE_1.0.0> sudo apt-mark hold woodpecker

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

dnf --showduplicates list woodpecker sudo dnf downgrade woodpecker-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add woodpecker

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-2023-40034?

woodpecker: upgrade to 1.0.2. Exact commands for each OS are on this page.

Is CVE-2023-40034 being exploited?

CVE-2023-40034 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-2023-40034 affect?

CVE-2023-40034 affects woodpecker. Severity is high (CVSS 8.1). Woodpecker is a community fork of the Drone CI system. In affected versions an attacker can post malformed webhook data witch lead to an update of the repository data that can e.g. allow the takeover of an repo. This is only critical if the

How urgent is CVE-2023-40034?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-41122 HIGH 7.5 UPGRADE Woodpecker is a simple yet powerful CI/CD engine with great extensibility
CVE-2024-41121 HIGH 8.8 UPGRADE Woodpecker is a simple yet powerful CI/CD engine with great extensibility

References

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