CVE-2026-97687 urllib3 - Authentication Bypass

urllib3 1.26.0 to 2.8.0 contains a broken authentication caused by incorrect application of target-server TLS settings to HTTPS proxy connections, letting attackers intercept and modify forwarded traffic, exploit requires use of HTTPS proxy with specific TLS configurations.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Man In The Middle, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-295

Vendor fix

Update to version 2.8.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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