Topic
Brotli
Apple Patches iMessage Group Chat Flaws Allowing Remote Attackers to Join Conversations
Vulnerabilities & Exploits
CISA Adds Brotli and Adobe Commerce Flaws to Known Exploited Vulnerabilities Catalog
Vulnerabilities & Exploits
Windows PHP Updated to Patch Critical Brotli Vulnerability CVE-2026-111497
Vulnerabilities & ExploitsCritical CVE-2026-111497 Out-of-Bounds Write Flaw in Google Brotli Decoder Impacts Broad Range of Environments
A severe vulnerability has been identified in the Google-developed Brotli decoder used for decompressing data in web communications and other applications. The flaw, tracked as CVE-2026-111497, allows out-of-bounds writes when processing specially crafted compressed data, potentially enabling arbitrary code execution, information disclosure, or denial of service. It carries a CVSS v4.0 base score of 9.2 and is rated Critical. Google has released patched versions 1.2.1, 1.1.1, and 1.0.10 of the library. Node.js incorporated the fix in its updates, while Microsoft issued an out-of-band patch for .NET on October 25, 2026, to address the issue. The vulnerability affects any environment relying on the Brotli C implementation for data decompression.
Microsoft Issues Out-of-Band .NET Security Updates Fixing Brotli Buffer Overflow and Other Flaws
Microsoft has released out-of-band security updates for .NET 10, .NET 9, and .NET 8 to address multiple vulnerabilities. The patches cover two newly identified issues and complete remediation for two additional flaws that received incomplete fixes during the October 13 monthly update cycle. One critical vulnerability, CVE-2026-111497, affects the Brotli compression library and can lead to information disclosure, denial of service, or privilege escalation when processing crafted compressed data. A second issue, CVE-2026-114148, enables local privilege escalation in Linux distribution packages for ASP.NET Core due to improper ownership handling. Microsoft also reissued fixes for remote code execution vulnerabilities CVE-2026-70197 and CVE-2026-102870. Organizations are advised to apply the updates immediately, including rebuilding and redistributing applications in container or embedded environments.
Node.js Fixes High-Severity Brotli Decoder Flaw Leading to Remote Code Execution
A high-severity vulnerability in the bundled Brotli decoder of Node.js allows out-of-bounds writes when processing attacker-controlled compressed data, potentially resulting in remote code execution. The flaw, tracked as CVE-2026-111497, affects all supported branches including 22.x, 24.x, and 26.x prior to the October 21, 2026 security release. Patched versions 22.23.4, 24.22.1, and 26.12.1 address the memory corruption issue that arises during Brotli decompression in services accepting third-party content. The same update resolves additional high-severity problems, notably hostname validation weaknesses in TLS. Organizations using unsupported branches such as 18.x, 20.x, 23.x, and 25.x must migrate to maintained releases, while those linking against system Brotli libraries should verify inclusion of upstream commit 0ed4268. Security teams are advised to audit all environments, including containers and CI pipelines, that process Brotli-encoded data.
Node.js Issues Security Updates Patching Ten Vulnerabilities Including High-Severity TLS Name Verification Bypasses
The Node.js project released security updates on October 21 for release lines 26, 24, and 22, addressing ten vulnerabilities with four rated high severity. The most critical issue, CVE-2026-111497, resides in the Brotli decoder and involves an out-of-bounds write that could enable remote code execution across all three supported lines. Two additional high-severity flaws affect TLS name verification: CVE-2026-105483 bypasses checks when addresses contain full-width digits, while CVE-2026-106069 fails on imprecise IP address resolution, potentially allowing a certificate to be accepted for an unintended destination. A fourth high-severity vulnerability, CVE-2026-105482, causes the dns.resolve function to truncate names containing null characters, creating inconsistencies between queried and resolved names. Medium-severity issues include out-of-order processing in HTTP socket keep-alive, improper certificate validation for non-standard IPv4 addresses, and repeated cryptographic random values in snapshot initialization and single-executable applications affecting crypto.randomUUID and crypto.randomInt. The updates also refresh c-ares, CA certificates, Undici, OpenSSL, and SQLite, with recommendations to test HTTPS outbound connections, DNS handling, Brotli-compressed content, and permission-restricted workloads.