CVE-2026-118359
Description
A memory corruption flaw was found in the V8 component of the Chromium browser.
Upstream bug(s):
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory.
Mitigation
--- CME Mitigation Guidance (2026-11-03) ---
Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.
The highest-value action is to disable JavaScript execution or run Chromium with jitless mode (--jitless) to prevent untrusted script execution in the V8 engine: upgrade to Chromium 156.0.8078.73+ (or the fixed Chromium builds), which resolves the memory corruption vulnerability in the V8 JavaScript engine, closing crafted HTML page. Until patched, this is a concern on Chromium users navigating to untrusted or compromised web pages across all supported platforms, so restrict user navigation to untrusted websites and enforce browser policies that disable JavaScript or activate jitless mode where full web scripting is not required. As a compensating measure, enable Address Space Layout Randomization to randomize memory layout and impede reliable offset targeting, enforce non-executable memory protections to block shellcode execution within writable data segments, deploy binaries compiled with Full RELRO and Position-Independent Executables to make Global Offset Table entries read-only, enforce Clang Control Flow Integrity to prevent code-reuse attacks following memory corruption, apply kernel-level seccomp syscall filtering to restrict system calls permitted from the renderer process sandbox, and deploy endpoint detection and response monitoring to detect anomalous post-exploitation child processes or payload execution. These controls limit blast radius and contain exploitation, but they do not fix the underlying V8 memory corruption defect — apply the upstream patch to fully remediate.
Highest-impact CME: CME-1309 Script Engine Restriction (Sandbox / Disable) (high)
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands; Modify Memory
This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. If the memory accessible by the attacker can be effectively controlled, it may be possible to execute arbitrary code, as with a standard buffer overflow. If the attacker can overwrite a pointer's worth of memory (usually 32 or 64 bits), they can alter the intended control flow by redirecting a function pointer to their own malicious code. Even when the attacker can only modify a single byte, arbitrary code execution can be possible. Sometimes this is because the same problem can be exploited repeatedly to the same effect. Other times it is because the attacker can overwrite security-critical application-specific data -- such as a flag indicating whether the user is an administrator.
Availability,Confidentiality
Technical Impact: Read Memory; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
Out of bounds memory access will very likely result in the corruption of relevant memory, and perhaps instructions, possibly leading to a crash. Other attacks leading to lack of availability are possible, including putting the program into an infinite loop.
Confidentiality
Technical Impact: Read Memory
In the case of an out-of-bounds read, the attacker may have access to sensitive information. If the sensitive information contains system details, such as the current buffer's position in memory, this knowledge can be used to craft further attacks, possibly with more severe consequences.
Frequently Asked Questions
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