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CVE-2025-66471VulnerabilityPublished Updated

Red Hat Security Advisory: python-urllib3 security update

Affects Red Hat python-urllib3Source GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 20:53 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.6% chance of exploitation in 30 days – higher than 52% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

AI-suggested

Red Hat has released updated python-urllib3 packages to address this vulnerability. Users of Red Hat Enterprise Linux Server Extended Life Cycle Support Extension 6 should apply the security update as described in Red Hat advisory RHSA-2026:11722. Refer to https://access.redhat.com/articles/11258 for update instructions. No additional mitigation steps are indicated by the vendor.

Description

A security vulnerability in the python-urllib3 library's Streaming API causes improper handling of highly compressed data. This issue is identified as CVE-2025-66471 and affects Red Hat Enterprise Linux Server Extended Life Cycle Support Extension 6. The vulnerability has been rated as important by Red Hat Product Security. A security update addressing this flaw is available.

References

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