CVE-2026-11143 in Chrome
Summary
by MITRE • 06/05/2026
Out of bounds read in Extensions in Google Chrome on Linux prior to 149.0.7827.53 allowed an attacker who convinced a user to install a malicious extension to obtain potentially sensitive information from process memory via a crafted Chrome Extension. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 06/05/2026
This vulnerability represents a critical out-of-bounds memory read flaw within the Chrome extension handling subsystem on linux platforms. The issue manifests when chrome processes maliciously crafted extensions that trigger memory access beyond the allocated bounds of extension data structures. Such out-of-bounds reads can potentially expose sensitive information from adjacent memory locations including user data, session tokens, or other confidential process memory contents. The vulnerability specifically affects versions prior to 149.0.7827.53 and operates through the extension installation and processing pipeline where chrome parses extension manifests and associated metadata. The attack vector requires social engineering to convince a user to install a malicious extension, making it a user-interaction dependent exploit that aligns with common attack patterns documented in the attack mitigation framework.
The technical implementation of this vulnerability stems from insufficient bounds checking during extension metadata processing within chrome's extension management system. When chrome parses extension manifests and related data structures, it fails to properly validate array indices or buffer boundaries before accessing extension properties. This flaw allows an attacker to craft extension packages that contain malformed data structures which trigger memory access violations. The chromium security severity classification of medium indicates the potential for information disclosure that could be leveraged for further attacks. This type of vulnerability maps directly to common weakness enumerations such as cwe-129 which describes improper validation of array indices, and cwe-131 which addresses insufficient checking for buffer overflows. The attack surface is particularly concerning in the extension ecosystem where third-party developers can submit code that gets executed within chrome's secure but privileged context.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable more sophisticated attacks within the chrome browser environment. An attacker who successfully exploits this vulnerability could extract sensitive data such as user credentials, browsing history, or session information that might be stored in adjacent memory regions. The linux-specific nature of this vulnerability indicates platform-specific memory management behaviors that could be exploited differently than on other operating systems. This type of information disclosure vulnerability can serve as a stepping stone for privilege escalation attacks or as part of a broader attack chain where the leaked information helps an attacker construct more convincing social engineering campaigns or target specific user accounts. The medium severity rating suggests that while exploitation requires user interaction, the potential information leakage could be substantial enough to warrant immediate remediation.
Mitigation strategies for this vulnerability should focus on immediate version updates to chrome 149.0.7827.53 or later where the bounds checking has been implemented. Organizations should enforce strict extension review policies and consider implementing chrome extension whitelisting where possible. Users should be educated about the risks of installing third-party extensions from untrusted sources and should be encouraged to regularly audit their installed extensions. Security monitoring should include detection of unusual extension installation patterns and behavior that might indicate exploitation attempts. The fix implemented by google likely involves enhanced bounds checking in the extension parsing code and additional memory validation routines that prevent out-of-bounds reads during extension manifest processing. Organizations should also consider implementing browser security extensions or enterprise management policies that can further restrict extension behavior and provide additional layers of protection against such vulnerabilities. This vulnerability highlights the importance of memory safety in browser security and demonstrates how seemingly minor implementation flaws can create significant information disclosure risks in complex software ecosystems.