Red Hat Security Advisory: python-urllib3 security update
Affects Red Hat python-urllib3Source GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 20:53 UTC
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
Disclosed: evidence found.
CVE published 29 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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.