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CVE-2025-66418 is a resource-exhaustion vulnerability in the Python HTTP client library urllib3, affecting versions 1.24 through versions before 2.6.0. HTTP response content decoding permits an unbounded number of chained compression algorithms. A malicious server can supply a response requiring virtually unlimited decompression steps, causing excessive CPU consumption and massive memory allocation on the client. The vulnerability can result in denial of service and is fixed in urllib3 2.6.0.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
26 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability whose CVSS vectors indicate high availability impact, with no confidentiality or integrity impact. Exploitation requires no privileges or user interaction. The content does not identify the affected product or underlying flaw.
A high-severity denial-of-service vulnerability in Python urllib3 versions 1.24 through versions prior to 2.6.0. A malicious server can supply a response with an unbounded decompression chain, causing excessive CPU consumption and memory allocation.
A high-severity denial-of-service vulnerability in urllib3 decompression handling. An attacker-controlled server can trigger excessive CPU consumption and memory allocation through an unbounded decompression chain.
A vulnerability referenced by a Rocky Linux 9.6 local security advisory; the provided content does not describe the technical flaw.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.