---
title: "CVE-2026-97687: urllib3 - Authentication Bypass"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-97687/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-97687)

## 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](https://cwe.mitre.org/data/definitions/295.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-97687](https://nvd.nist.gov/vuln/detail/CVE-2026-97687)
- [https://github.com/urllib3/urllib3/commit/07408cec79d1856d81bb42c74a904a24fdb9e465](https://github.com/urllib3/urllib3/commit/07408cec79d1856d81bb42c74a904a24fdb9e465)
- [https://github.com/urllib3/urllib3/commit/b6447295fff7b38fdffc67e0df9712d60cef3cc3](https://github.com/urllib3/urllib3/commit/b6447295fff7b38fdffc67e0df9712d60cef3cc3)
- [https://github.com/urllib3/urllib3/pull/5093](https://github.com/urllib3/urllib3/pull/5093)
- [https://github.com/urllib3/urllib3/releases/tag/2.8.0](https://github.com/urllib3/urllib3/releases/tag/2.8.0)
- [https://github.com/urllib3/urllib3/security/advisories/GHSA-8988-9cw3-xx77](https://github.com/urllib3/urllib3/security/advisories/GHSA-8988-9cw3-xx77)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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