CVE-2026-21628: A improperly secured file management feature allows uploads of dangerous data types for unauthenticated users,

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-21628 is a critical-severity flaw (CVSS 9.8) affecting astroid framework. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A improperly secured file management feature allows uploads of dangerous data types for unauthenticated users, leading to remote code execution.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-03-05
Last modified	2026-06-17

Publisher (CNA): Joomla! Project · Vendor: templaza

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

Am I affected?

Timeline

2026-03-05 10:15 UTCPublished CVE record published
2026-06-17 10:18 UTCUpdated Record last modified

templaza astroid framework UPGRADE

Affected: >= 2.0.0 and <= 3.3.10

Fixed in: newer than 3.3.10

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy astroid-framework || rpm -q astroid-framework || astroid-framework --version

2. UPGRADE to newer than 3.3.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade astroid-framework

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade astroid-framework

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 astroid-framework sudo apt install astroid-framework=<VERSION_BEFORE_2.0.0> sudo apt-mark hold astroid-framework

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

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

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-2026-21628?

astroid framework: upgrade to newer than 3.3.10. Exact commands for each OS are on this page.

Is CVE-2026-21628 being exploited?

CVE-2026-21628 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-2026-21628 affect?

CVE-2026-21628 affects astroid framework. Severity is critical (CVSS 9.8). A improperly secured file management feature allows uploads of dangerous data types for unauthenticated users, leading to remote code execution.

How urgent is CVE-2026-21628?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

References

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