CVE-2026-33511

Name: CVE-2026-33511
Creator: NVD / NIST
Published: 2026-03-24T20:16:30.203+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2026-33511 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

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. This issue has been patched in version 0.5.0b3.dev97.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

8.8/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.42%

33.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-639

Affected Software

Vendor	Product	Versions
Pyload	Pyload	<= 0.4.20
Pyload-Ng Project	Pyload-Ng	>= 0.5.0a5.dev528, < 0.5.0b3.dev97

References

https://github.com/pyload/pyload/security/advisories/GHSA-g5j2-gxqh-x7pwExploit, Mitigation, Vendor Advisory
https://github.com/pyload/pyload/security/advisories/GHSA-g5j2-gxqh-x7pwExploit, Mitigation, Vendor Advisory

Timeline

Published: Mar 24, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33511?

How severe is CVE-2026-33511?

CVE-2026-33511 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33511?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33511?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST