Is CVE-2026-33511 actively exploited?

CVE-2026-33511 has no public evidence of in-the-wild exploitation as of 2026-03-26.

What is the CVSS score for CVE-2026-33511?

CVE-2026-33511 has a CVSS score of 8.8 (HIGH severity). Vector: 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.

How do I patch CVE-2026-33511?

Patch guidance is available from pyload security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-33511.

Fix CVE-2026-33511 - HIGH pyload pyload

Q: Which products are affected by CVE-2026-33511?

2 products: pyload pyload, pyload-ng project pyload-ng.

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.

CVSS Metrics

Vector: 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
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-639

Metadata

Primary Vendor: PYLOAD
Published: 3/24/2026
Last Modified: 3/26/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-33511

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary