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NVD / CVE Program· CNA GitHub_M

CVE-2025-50181: urllib3 redirects are not disabled when retries are disabled on PoolManager instantiation

MediumCVSS 6.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.47% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: urllib3 urllib3 2.5.0.

Low priority for now. Upgrade to urllib3 urllib3 2.5.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

urllib3 is a user-friendly HTTP client library for Python. Prior to 2.5.0, it is possible to disable redirects for all requests by instantiating a PoolManager and specifying retries in a way that disable redirects. By default, requests and botocore users are not affected. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects at the PoolManager level will remain vulnerable. This issue has been patched in version 2.5.0.

Published
Jun 18, 2025
Updated
Jun 17, 2026
EPSS
0.4% · 41th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
6.1
CNA · GitHub_M
5.3
0.8 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Follow CVE-2025-50181

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
pythonurllib3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • urllib3 urllib3

    • < 2.5.0affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • python urllib3before 2.5.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:11python-urllib3before 1.26.5-1~exp1+deb11u21.26.5-1~exp1+deb11u2
Debian:12python-urllib3before 1.26.12-1+deb12u21.26.12-1+deb12u2
Debian:13python-urllib3before 2.3.0-32.3.0-3
openSUSE:Leap 15.6python-urllib3before 2.0.7-150400.7.21.12.0.7-150400.7.21.1
openSUSE:Tumbleweedoci-clibefore 3.76.2-1.13.76.2-1.1
openSUSE:Tumbleweedpython-urllib3before 2.5.0-1.12.5.0-1.1
openSUSE:Tumbleweedpython-urllib3_1before 1.26.20-3.11.26.20-3.1
PyPIurllib3before 2.5.02.5.0
SUSE:Linux Enterprise Micro 5.3python-urllib3before 1.25.10-150300.4.18.11.25.10-150300.4.18.1
SUSE:Linux Enterprise Module for Public Cloud 12python-urllib3before 1.25.10-3.43.11.25.10-3.43.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP4python-urllib3before 2.0.7-150400.7.21.12.0.7-150400.7.21.1
SUSE:Linux Micro 6.0python-urllib3before 2.1.0-3.12.1.0-3.1
SUSE:Linux Micro 6.1python-urllib3before 2.1.0-slfo.1.1_2.12.1.0-slfo.1.1_2.1

Same product

python: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-20060urllib3 before version 1.23 does not remove the Authorization HTTP header when following a cross-origin redirect (i.e., a redirect that…
    40Plan
  • CVE-2026-21441urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)
    36Monitor
  • CVE-2026-97689urllib3: HTTPResponse.stream()/read_chunked() buffers an unbounded chunk-size line into memory
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2023-45803Oct 17, 2023 · Request body not stripped after redirect in urllib3
    16Monitor
  • ← EarlierCVE-2024-37891Jun 17, 2024 · Proxy-Authorization request header isn't stripped during cross-origin redirects in urllib3
    26Monitor
  • Later →CVE-2025-50182Jun 18, 2025 · urllib3 does not control redirects in browsers and Node.js
    24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
urllib3 urllib32.5.0 · descriptionVendor (CNA)
debian:python-urllib31.26.12-1+deb12u2 · Debian:12Package registry (OSV)
opensuse:oci-cli3.76.2-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python-urllib32.0.7-150400.7.21.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:python-urllib3_11.26.20-3.1 · openSUSE:TumbleweedPackage registry (OSV)
PyPI:urllib32.5.0Package registry (OSV)
suse:python-urllib32.0.7-150400.7.21.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-501820 days aparturllib3 does not control redirects in browsers and Node.js
    24Monitor

Not on record for this CVE: EPSS history · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

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

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records