Indicator investigation
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Indicator
Type cve · source NVD CVE
HIGH SEVERITY (CVSS 7.5)
Vulnerability investigation
The available snapshot does not list this vulnerability in CISA KEV; that is not proof exploitation has not occurred. NVD rates the technical severity high at CVSS 7.5. These are public vulnerability signals, not proof that a specific environment runs an affected version.
Exploitation status
No KEV listing in available snapshot
Absence from KEV does not establish absence of exploitation.
30-day exploitation likelihood
Unavailable
FIRST EPSS did not return a score.
Technical severity
7.5 · high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected surface
1 parsed product
Python Urllib3
Weakness class
CWE-409
CWE describes the weakness category, not whether a deployed product is reachable or exploitable.
Corpus evidence
1 connectors · 30 citations
No related report text is available in the local corpus.
Findings stay bounded to named sources and observable infrastructure.
urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.
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Investigation status
Checking for newly completed evidence
NIST NVD
NVD evidence is available in this response
CISA KEV
Known-exploitation catalog check is pending
FIRST EPSS
Forensia does not request or publish EPSS while source rights are under review
Reports
Report links are still being resolved
Relationships
Product and vulnerability relationships are still being prepared
Local EPSS row, KEV flag, and catalog notes from stored metadata only.
Vendor/product strings parsed from local CPE URIs (no inferred ATT&CK).
| Product | CPE (truncated) |
|---|---|
| Python Urllib3 | cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:* |
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