# CVE-2026-125343: Buffer overflow in Compositing in Google Chrome prior to 157.0.8103.50 allowed a remote attacker who had compromised the renderer process to


- **Severity:** High 8.3 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 10 Nov 2026
- **Updated:** 11 Nov 2026
- **Also known as:** DEBIAN-CVE-2026-125343, ECHO-39b5-70c5-9a6a, GHSA-7v43-mw4f-4f3q

## What is CVE-2026-125343?

CVE-2026-125343 is a high-severity vulnerability in Google Chrome, published on 10 Nov 2026. 

### Official description

Buffer overflow in Compositing in Google Chrome prior to 157.0.8103.50 allowed a remote attacker who had compromised the renderer process to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2026-125343?

It affects 1 product.


Products: Google Chrome.

## How do I fix CVE-2026-125343?

Upgrade to a fixed version.

## Is CVE-2026-125343 being exploited?

There is no known exploitation of CVE-2026-125343 in the wild and no public exploit code.

## Other vulnerabilities in Google Chrome

- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)
- [CVE-2023-6345](https://insights.sbomify.com/CVE-2023-6345/): Google Skia Integer Overflow (critical 9.6, exploited in the wild)
- [CVE-2023-2136](https://insights.sbomify.com/CVE-2023-2136/): Google Chrome Skia Integer Overflow (critical 9.6, exploited in the wild)
- [CVE-2022-4135](https://insights.sbomify.com/CVE-2022-4135/): Google Chromium GPU Heap Buffer Overflow (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-125343 and fix it if it is affected.

What it is: CVE-2026-125343 is a high-severity vulnerability in Google Chrome, published on 10 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-125343 in the wild and no public exploit code.

Affected product: Google Chrome. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-125343/ (Markdown: https://insights.sbomify.com/CVE-2026-125343/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-125343
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-125343
- OSV: https://osv.dev/vulnerability/CVE-2026-125343

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-125343/
Summaries are generated and may contain mistakes; the official description above is the record.