Allocation of Resources Without Limits or Throttling in urllib3 - CVE-2026-97689

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Main Vulnerability Database Vulnerabilities #VU150184

Allocation of Resources Without Limits or Throttling in urllib3 - CVE-2026-97689

Published: September 16, 2026 / Updated: September 30, 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: CVE-2026-97689
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
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Public Cloud Module
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP Applications
Python 3 Module
Basesystem Module
openSUSE Leap
Ubuntu
openEuler
SOAR QRadar Plugin App
QRadar App SDK
python-urllib3 (Ubuntu package)
python3-urllib3 (Ubuntu package)
python-urllib3 (Red Hat package)
python-urllib3
python3-urllib3
python311-urllib3_1
python3.12-urllib3 (Red Hat package)
python311-urllib3
python3.14-urllib3 (Red Hat package)

How to mitigate CVE-2026-97689

Install security update from vendor's website.

urllib3 - update to 2.8.0
SOAR QRadar Plugin App - update to 5.7.1
python-urllib3 (Ubuntu package) - update to 1.22-1ubuntu0.18.04.2+esm5
python3-urllib3 (Ubuntu package) - addressed in versions 1.22-1ubuntu0.18.04.2+esm5, 1.25.8-2ubuntu0.4+esm6, 1.26.5-1~exp1ubuntu0.8, 2.0.7-1ubuntu0.8, 2.6.3-1ubuntu1.2
python-urllib3 (Red Hat package) - addressed in versions 1.24.2-11.el8_10, 1.26.5-8.el9_8.2, 1.26.19-4.el10_2.2
python-urllib3 - update to 1.25.10-3.54.1
python3-urllib3 - addressed in versions 1.25.10-3.54.1, 1.25.10-150300.4.33.1
python3-urllib3 - addressed in versions 1.26.12-16, 1.26.18-10
python-urllib3 - addressed in versions 1.26.12-16, 1.26.18-10
python311-urllib3_1 - update to 1.26.18-150600.3.14.1
python3.12-urllib3 (Red Hat package) - addressed in versions 1.26.19-3.el9_8.2, 1.26.19-5.el8_10
python311-urllib3 - update to 2.0.7-150400.7.36.1
python3.14-urllib3 (Red Hat package) - addressed in versions 2.6.3-2.el9_8.6, 2.6.3-2.el10_2.6
QRadar App SDK - update to 2.2.8

External References

Related Security Bulletins