Bug 2419455 (CVE-2025-66418) - CVE-2025-66418 urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion
Summary: CVE-2025-66418 urllib3: urllib3: Unbounded decompression chain leads to resou...
Keywords:
Status: NEW
Alias: CVE-2025-66418
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On: 2422212 2422213 2422507 2422508 2422509 2422510 2422511 2422512 2422513 2422514 2422515 2422591
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-05 17:01 UTC by OSIDB Bzimport
Modified: 2025-12-19 08:27 UTC (History)
160 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2025-12-05 17:01:44 UTC 
urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0.
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