CVE-2026-79181 in Chrome
Summary
by MITRE • 08/26/2026
Observable discrepancy in Glic in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to obtain sensitive information via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an observable discrepancy in the Global Interpreter Context, commonly referred to as glic within Google Chrome prior to version 152.0.7977.65, represents a state management flaw that can be exploited by remote attackers to leak sensitive information. This issue stems from how the browser handles execution contexts during the processing of crafted HTML pages. When a malicious webpage is loaded, it can manipulate or observe subtle differences in the global interpreter context that should ideally remain opaque and consistent across different browsing sessions or frames. These discrepancies arise because certain internal states are not properly isolated or reset between page loads, allowing an attacker to infer information about the user's environment or previous interactions based on how the browser responds to specific script executions.
From a technical perspective, this flaw falls under the category of state leakage through side channels or improper isolation mechanisms. The Global Interpreter Context is responsible for maintaining variables and execution states during JavaScript processing. If discrepancies are observable, it implies that an attacker can detect variations in timing, memory usage patterns, or return values that correlate with specific internal browser states. This type of vulnerability is often categorized under CWE-200: Information Exposure through Diagnostic Information, as the flaw does not necessarily allow direct code execution but rather provides a channel for data exfiltration based on observable behaviors. The severity is rated as Low by Chromium security teams because it typically requires precise timing or specific environmental conditions to reliably extract meaningful data, and the amount of information gained may be limited without further exploitation steps.
The operational impact of this vulnerability centers on privacy violations rather than immediate system compromise. A remote attacker hosting a malicious webpage can craft HTML content designed to trigger these observable discrepancies when visited by an unsuspecting user. By analyzing the responses or side effects generated during script execution, the attacker might deduce sensitive details such as whether certain extensions are installed, specific cookies are present, or if particular browser features have been previously accessed. This undermines the principle of least privilege and isolation that browsers strive to maintain between different origins. While it does not directly lead to full system takeover, it facilitates targeted phishing campaigns or fingerprinting efforts that can enhance social engineering attacks by providing attackers with contextual knowledge about their target's browsing habits and security posture.
Mitigation for this vulnerability primarily relies on updating the browser software. Users running Google Chrome versions prior to 152.0.7977.65 are advised to upgrade immediately, as the patch addresses the underlying state management issues that cause these observable discrepancies. In addition to applying updates, organizations should enforce strict content security policies and consider deploying extensions or configurations that limit cross-origin data access where possible. Security awareness training is also recommended to help users recognize suspicious web pages that may attempt to exploit such information leakage techniques. Monitoring for unusual network traffic patterns associated with known exploitation kits can provide an additional layer of defense against attempts to leverage this flaw in the wild.
This vulnerability aligns with ATT&CK technique T1078: Valid Accounts, specifically regarding how attackers use environmental reconnaissance to validate target characteristics before launching more sophisticated attacks. It also relates to CWE-209 as it generates information that could be used by an attacker for further exploitation. The fix ensures that the global interpreter context remains consistent and does not expose internal state variations through observable means, thereby closing this specific side-channel leakage vector. Maintaining up-to-date browser versions is critical in preventing such low-severity but privacy-impacting vulnerabilities from being exploited in coordinated attacks against high-value targets.