Allocation of Resources Without Limits or Throttling in urllib3 - #VU150184
Published: September 16, 2026 / Updated: September 18, 2026
Vulnerability identifier: #VU150184
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the HTTPResponse.stream() and read_chunked() methods when processing a chunked-transfer-encoded response with an unterminated chunk-size field. A remote attacker can send a crafted chunked response containing a long run of bytes without a newline to cause a denial of service.
Affected software
urllib3
Remediation
Install security update from vendor's website.
urllib3 - update to 2.8.0