SB2026090316 - Red Hat Enterprise Linux 9 update for rhc

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Main Vulnerability Database SB2026090316

SB2026090316 - Red Hat Enterprise Linux 9 update for rhc

Published: September 3, 2026 Updated: September 30, 2026

Security Bulletin ID SB2026090316
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Uncontrolled Recursion (CVE-ID: CVE-2026-33818)

CWE-ID: CWE-674 - Uncontrolled Recursion

CVSSv4: 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]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled recursion in Unmarshal and UnmarshalWithParams in encoding/asn1 when parsing deeply nested recursive structures. A remote attacker can supply specially crafted ASN.1 input to cause a denial of service.


2) Resource exhaustion (CVE-ID: CVE-2026-56860)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 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]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in net/url URL.Parse and URL.ResolveReference when processing relative paths containing parent directory ('..') segments. A remote attacker can send specially crafted input to cause a denial of service.


3) Cross-site scripting (CVE-ID: CVE-2026-56858)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]


The vulnerability allows a remote attacker to inject arbitrary content, potentially leading to cross-site scripting.

The vulnerability exists due to improper neutralization of special elements in html/template when rendering pathological inputs that close an unescaped '/' early. A remote attacker can supply crafted input data to inject arbitrary content, potentially leading to cross-site scripting.


4) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-56862)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 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]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper state management in crypto/tls when processing handshake messages before handshake completion. A remote attacker can send repeated KeyUpdate messages to cause a denial of service.


Remediation

Install update from vendor's website.

References