CVE-2021-4307: A vulnerability was found in Yomguithereal Baobab up to 2.6.0

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MEDIUM 6.3UPGRADE

CVE-2021-4307 is a medium-severity flaw (CVSS 6.3) affecting baobab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in Yomguithereal Baobab up to 2.6.0. It has been declared as critical. Affected by this vulnerability is an unknown functionality. The manipulation leads to improperly controlled modification of object prototype attributes ('prototype pollution'). The attack can be launched remotely. Upgrading to version 2.6.1 is able to address this issue. The patch is named c56639532a923d9a1600fb863ec7551b188b5d19. It is recommended to

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-1321
Published	2023-01-07
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: baobab project

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

Am I affected?

Timeline

2023-01-07 20:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

baobab project baobab UPGRADE

Affected: >= 2.0.0 and < 2.6.1

Fixed in: 2.6.1

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. UPGRADE to 2.6.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade baobab

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 2.0.0 (Debian / Ubuntu)

apt-cache madison baobab sudo apt install baobab=<VERSION_BEFORE_2.0.0> sudo apt-mark hold baobab

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

dnf --showduplicates list baobab sudo dnf downgrade baobab-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add baobab

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-2021-4307?

baobab: upgrade to 2.6.1. Exact commands for each OS are on this page.

Is CVE-2021-4307 being exploited?

CVE-2021-4307 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-2021-4307 affect?

CVE-2021-4307 affects baobab. Severity is medium (CVSS 6.3). A vulnerability was found in Yomguithereal Baobab up to 2.6.0. It has been declared as critical. Affected by this vulnerability is an unknown functionality. The manipulation leads to improperly controlled modification of object prototype at

How urgent is CVE-2021-4307?

Priority 45/100. Public exploit reference

References

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