Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2026-15308

Uncontrolled Resource Consumption

Published: Jul 09, 2026 | Modified: Jul 23, 2026
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-15308
CWEhttps://cwe.mitre.org/data/definitions/400.html

The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

NameVendorStart VersionEnd Version
PythonPython*3.15.0 (excluding)
Red Hat Enterprise Linux 10RedHatpython3.12-0:3.12.13-2.el10_2.1*
Red Hat Enterprise Linux 10RedHatpython3.14-0:3.14.5-1.el10_2.1*
Red Hat Enterprise Linux 10.0 Extended Update SupportRedHatpython3.12-0:3.12.9-2.el10_0.10*
Red Hat Enterprise Linux 8RedHatpython3-0:3.6.8-77.el8_10*
Red Hat Enterprise Linux 8RedHatpython3.12-0:3.12.13-3.el8_10*
Red Hat Enterprise Linux 8RedHatpython3-0:3.6.8-77.el8_10*
Red Hat Enterprise Linux 9RedHatpython3.12-0:3.12.13-3.el9_8.1*
Red Hat Enterprise Linux 9RedHatpython3.9-0:3.9.25-7.el9_8.2*
Red Hat Enterprise Linux 9RedHatpython3.14-0:3.14.5-1.el9_8.1*
Red Hat Enterprise Linux 9RedHatpython3.9-0:3.9.25-7.el9_8.2*
Red Hat Discovery 2RedHatdiscovery/discovery-server-rhel9:1784821670*
Red Hat Discovery 2RedHatdiscovery/discovery-ui-rhel9:1784821750*
Red Hat Hardened ImagesRedHatpython3-14-main-3.14.6-1.3.hum1*
Red Hat Hardened ImagesRedHatpython3-13-main-3.13.14-1.3.hum1*
Red Hat Hardened ImagesRedHatpython3-12-main-3.12.13-3.5.hum1*
Red Hat Hardened ImagesRedHatpython3-11-main-3.11.15-5.2.hum1*
Red Hat Update Infrastructure 5RedHatrhui5/cds-kubernetes-rhel9:1784794818*
Red Hat Update Infrastructure 5RedHatrhui5/cds-rhel9:1784794778*
Red Hat Update Infrastructure 5RedHatrhui5/haproxy-rhel9:1784795112*
Red Hat Update Infrastructure 5RedHatrhui5/installer-rhel9:1784794289*
Red Hat Update Infrastructure 5RedHatrhui5/rhua-rhel9:1784795076*

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References

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