CVE-2026-87497 in Chrome
Summary
by MITRE • 09/09/2026
Uninitialized resource in Codecs in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to read memory inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an uninitialized resource issue within the codecs component of Google Chrome represents a significant class of memory safety defects that have historically plagued browser engines and multimedia processing libraries. This specific flaw, present in versions prior to 153.0.8010.36, stems from improper initialization of internal data structures or buffers used during the decoding process for audio or video content. When a malicious actor constructs an HTML page containing specially crafted media files or script-driven codec invocations, they can trigger code paths where these resources are accessed before being properly zeroed out or allocated with valid memory boundaries. This lack of initialization means that the application may read from arbitrary locations in the process address space rather than the intended buffer, leading to a classic uninitialized memory read condition.
From a technical perspective, this flaw falls squarely under CWE-457, which describes the use of an uninitialized variable or resource. In the context of modern web browsers like Chrome, security is heavily reliant on sandboxing mechanisms designed to isolate untrusted content from sensitive system resources and user data. The codecs component often operates within these restricted environments to prevent arbitrary code execution. However, when a vulnerability allows for memory disclosure even inside the sandbox, it undermines the integrity of this isolation layer. An attacker leveraging this flaw can perform side-channel attacks or direct information leaks by reading uninitialized stack or heap memory that may contain pointers, cryptographic keys, session tokens, or other sensitive data from previous operations within the same process context.
The operational impact of such a vulnerability is primarily centered on confidentiality rather than availability or integrity in its immediate form. While an uninitialized read does not directly grant code execution privileges like buffer overflow vulnerabilities might, it serves as a powerful information disclosure vector that can be chained with other exploits to achieve full sandbox escape. For instance, leaked memory contents could reveal the layout of heap structures or pointers to critical objects, enabling subsequent exploitation steps such as arbitrary write primitives or control flow hijacking. Consequently, this medium-severity Chromium security issue poses a tangible risk to users who visit malicious websites hosting crafted media content, potentially leading to unauthorized access to private information stored in browser memory.
Mitigation strategies for this type of vulnerability require both immediate patching and long-term architectural improvements. The primary defense is the deployment of Chrome version 153.0.8010.36 or later, which includes code changes ensuring that all codec-related resources are properly initialized before use. Developers must enforce strict initialization protocols in C++ codebases to prevent access to uninitialized memory regions. Furthermore, integrating static analysis tools and fuzzing frameworks into the development lifecycle can help detect such issues early by simulating edge cases where media parsing logic might encounter malformed inputs. Runtime protections like Address Sanitizer (ASan) during testing phases are also critical for identifying these defects before they reach production builds.
In terms of industry standard classification, this vulnerability aligns with ATT&CK technique T1005, which covers Data from Local System, specifically the sub-technique related to memory scraping or reading sensitive data without direct file access. It also relates to CWE-20 regarding improper input validation if the root cause involves failing to validate media headers before processing them into codec pipelines. Security teams should prioritize updating browser software across all endpoints and monitor for any indicators of exploitation attempts that involve unusual network traffic patterns following visits to sites hosting complex multimedia content. Regular security audits focusing on memory management practices in high-risk components like codecs are essential to maintaining robust defense-in-depth strategies against such information disclosure vulnerabilities.