CVE-2026-121118
Description
An use after free flaw was found in the SVG 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 (2026-11-04) ---
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 enforce Control Flow Integrity to prevent hijacked indirect calls and virtual method dispatch during SVG rendering: upgrade to Chromium 157.0.8103.38+ (or the fixed Chromium builds), which resolves the use-after-free memory corruption flaw in the SVG rendering component, closing all 2 injection vectors (crafted HTML page with embedded SVG markup, crafted standalone SVG document). Until patched, this is a concern on all platforms running affected Chromium-based browsers opening untrusted content, so restrict user access to untrusted websites and avoid opening untrusted standalone SVG or HTML documents. As a compensating measure, ensure address space layout randomization is active to prevent reliable heap targeting, enforce non-executable memory protections to block direct execution of injected shellcode on the heap, maintain full RELRO and PIE binaries to prevent GOT overwrites during weaponization, and deploy endpoint detection and response agents to monitor and detect anomalous browser process behavior. These controls limit blast radius and contain exploitation, but they do not fix the underlying SVG use-after-free defect — apply the upstream patch to fully remediate.
Highest-impact CME: CME-113 Control Flow Integrity (CFI / Shadow Call Stack) (high)
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory
The use of previously freed memory may corrupt valid data, if the memory area in question has been allocated and used properly elsewhere.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If chunk consolidation occurs after the use of previously freed data, the process may crash when invalid data is used as chunk information.
Confidentiality
Technical Impact: Read Memory
Read operations on freed memory can sometimes leak sensitive information instead of causing a crash
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If malicious data is entered before chunk consolidation can take place, it may be possible to take advantage of a write-what-where primitive to execute arbitrary code. If the newly allocated data happens to hold a class, in C++ for example, various function pointers may be scattered within the heap data. If one of these function pointers is overwritten with an address to valid shellcode, execution of arbitrary code can be achieved.
Frequently Asked Questions
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