CVE-2025-50182Network attack vector

SSRF protection bypass via ignored redirect controls

Published Jun 19, 2025 · Updated Dec 22, 2025

Open redirect in urllib3 2.2.0 through 2.4.0 allows remote authenticated users to bypass redirect-based SSRF controls in Pyodide. The Emscripten Fetch adapter omits manual redirect handling, so the runtime follows redirects while ignoring urllib3 retry and redirect parameters. Reachability requires a browser or Node.js Pyodide runtime and consuming code that relies on urllib3 to restrict redirects, exposing destinations otherwise blocked by SSRF controls.

CVSS severity5.3
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in urllib3 2.2.0 through 2.4.0 allows remote authenticated users to bypass redirect-based SSRF controls in Pyodide. The Emscripten Fetch adapter omits manual redirect handling, so the runtime follows redirects while ignoring urllib3 retry and redirect parameters. Reachability requires a browser or Node.js Pyodide runtime and consuming code that relies on urllib3 to restrict redirects, exposing destinations otherwise blocked by SSRF controls.

The record

CVE
CVE-2025-50182
Published
Jun 19, 2025
Updated
Dec 22, 2025
Vendor
urllib3
Product
urllib3
Classifications
CWE-601
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.2.0, < 2.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

urllib3 · urllib3version=>= 2.2.0, < 2.5.0

Published CVSS scores

5.3GitHub CNACVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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