CVE-2026-106284 in Chrome
Summary
by MITRE • 10/06/2026
Out of bounds read in Printing in Google Chrome on on Windows prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process and leveraged social engineering to read memory outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an out-of-bounds read within Google Chrome's printing subsystem on Windows represents a significant breach of browser isolation boundaries, specifically affecting versions prior to 155.0.8059.39. This flaw resides in the code responsible for handling print operations and document rendering pipelines, where improper bounds checking allows access to memory regions that should remain inaccessible to untrusted web content. The severity is classified as medium by Chromium security standards, reflecting its potential impact on confidentiality rather than immediate remote code execution without additional exploitation steps.
The technical nature of this flaw involves a classic out-of-bounds read condition within the printing module. When processing specific print-related data structures or rendering instructions embedded in a webpage, the application fails to validate that memory access requests stay within allocated buffer limits. Consequently, if an attacker crafts a malicious HTML page containing specially constructed elements designed to trigger these code paths, they can cause the browser engine to read from adjacent memory locations beyond the intended scope of the current object or array. This behavior violates fundamental principles of safe memory management and exposes internal data structures that are not meant for public consumption by web pages.
Exploitation of this vulnerability requires a multi-stage approach due Chrome's robust sandboxing architecture. An attacker cannot directly execute arbitrary code through this flaw alone because the printing process operates within a restricted environment with limited privileges. Instead, the attack vector relies on social engineering to persuade a user to visit a malicious website hosting the crafted HTML page. Once loaded, the renderer process is compromised by leveraging the out-of-bounds read to leak sensitive information from memory outside the sandbox boundary. This leaked data can include cryptographic keys, session tokens, or other confidential details stored in adjacent memory spaces of higher-privilege processes or internal browser structures.
The operational impact centers on confidentiality and potential privilege escalation pathways rather than direct system compromise. By reading arbitrary memory contents, an attacker gains insights into the state of the browser environment which may facilitate further attacks such as cross-site scripting amplification, session hijacking, or bypassing security features like Same-Origin Policy protections in complex scenarios. While this does not immediately grant control over the host operating system, it significantly degrades the trust model that underpins modern web browsing by allowing untrusted content to peek into protected memory regions.
From a classification perspective, this vulnerability aligns with CWE-125 Out-of-bounds Read and is associated with ATT&CK technique T1005 Data from Local System which describes techniques for collecting data directly from the local system through file access or memory scraping. The attack pattern also reflects aspects of T1059 Command and Scripting Interpreter if subsequent steps involve using leaked information to execute further scripts, though the primary impact here is informational disclosure via sandbox escape mechanisms.
Mitigation strategies primarily focus on timely patch management as Google has released updates in version 155.0.8059.39 and later that correct the bounds checking logic within the printing subsystem. Organizations should ensure all endpoints running Windows are updated to these patched versions immediately. Additionally, implementing strict content security policies can help mitigate risks by restricting inline scripts and reducing the attack surface for social engineering campaigns. User awareness training remains critical since exploitation depends on convincing victims to interact with malicious web pages that trigger this specific code path in their browsers.