SB2026102740 - Red Hat Enterprise Linux 9 update for brotli

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Main Vulnerability Database SB2026102740

SB2026102740 - Red Hat Enterprise Linux 9 update for brotli

Published: October 27, 2026 Updated: October 27, 2026

Security Bulletin ID SB2026102740
CSH Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Medium 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Out-of-bounds write (CVE-ID: CVE-2026-111497) Exploited

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to corrupt process memory, potentially execute arbitrary code, disclose process memory, or cause a denial of service.

The vulnerability exists due to an out-of-bounds write in the Brotli decoder bundled with Node.js when an invalid block switch is treated as a temporary need for input rather than a permanent format error. A remote attacker can supply malformed Brotli data that an application decompresses with node:zlib to make the streaming decoder append bytes beyond an eight-byte internal buffer, potentially causing code execution, process memory disclosure, or a crash.


2) Resource exhaustion (CVE-ID: CVE-2025-66471)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the streaming API does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References