CVE-2026-33511: pyLoad is a free and open-source download manager written in Python

Q: How do I fix CVE-2026-33511?

pyload: upgrade to newer than 0.4.20; pyload-ng: upgrade to 0.5.0b3.dev97. Exact commands for each OS are on this page.

Q: Is CVE-2026-33511 being exploited?

CVE-2026-33511 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33511 affect?

CVE-2026-33511 affects pyload, pyload-ng. Severity is critical (CVSS 9.8). pyLoad is a free and open-source download manager written in Python. From version 0.4.20 to before version 0.5.0b3.dev97, the local_check decorator in pyLoad's ClickNLoad feature can be bypassed by any remote attacker through HTTP Host head

Q: How urgent is CVE-2026-33511?

Priority 54/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2026-33511 is a critical-severity flaw (CVSS 9.8) affecting pyload, pyload-ng. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

pyLoad is a free and open-source download manager written in Python. From version 0.4.20 to before version 0.5.0b3.dev97, the local_check decorator in pyLoad's ClickNLoad feature can be bypassed by any remote attacker through HTTP Host header spoofing. This allows unauthenticated remote users to access localhost-restricted endpoints, enabling them to inject arbitrary downloads, write files to the storage directory, and execute JavaScript code. Th

Why this priority

Critical severity
Public exploit reference
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	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: pyload · pyload-ng project

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

Am I affected?

Timeline

2026-03-24 20:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

pyload pyload UPGRADE

Affected: <= 0.4.20

Fixed in: newer than 0.4.20

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.4.20 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pyload

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

pyload-ng project pyload-ng UPGRADE

Affected: >= 0.5.0a5.dev528 and < 0.5.0b3.dev97

Fixed in: 0.5.0b3.dev97

Safe to downgrade to: a release before 0.5.0a5.dev528

1. Check installed version

pip show pyload-ng

2. UPGRADE to 0.5.0b3.dev97

pip install --upgrade "pyload-ng>=0.5.0b3.dev97"

3. If no update is available yet, DOWNGRADE to a release before 0.5.0a5.dev528

pip index versions pyload-ng pip install "pyload-ng<0.5.0a5.dev528"

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-2026-33511?

pyload: upgrade to newer than 0.4.20; pyload-ng: upgrade to 0.5.0b3.dev97. Exact commands for each OS are on this page.

Is CVE-2026-33511 being exploited?

CVE-2026-33511 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-2026-33511 affect?

CVE-2026-33511 affects pyload, pyload-ng. Severity is critical (CVSS 9.8). pyLoad is a free and open-source download manager written in Python. From version 0.4.20 to before version 0.5.0b3.dev97, the local_check decorator in pyLoad's ClickNLoad feature can be bypassed by any remote attacker through HTTP Host head

How urgent is CVE-2026-33511?

Priority 54/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

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CVE-2026-35464 HIGH 7.5 UPGRADE pyLoad is a free and open-source download manager written in Python
CVE-2026-33992 MEDIUM 6.5 DOWNGRADE pyLoad is a free and open-source download manager written in Python

References

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