# CVE-2026-15121 — Google Chrome

> As of 2026-07-10, CVE-2026-15121 is a HIGH-severity vulnerability in Google Chrome, CVSS v3.1 8.8, EPSS 0.5% (42.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-15121, most recently “Google Chrome 150.0.7871.114/.115 Patches 27 Vulnerabilities Including Two Critical Use-After-Free Flaws (CVE-2026-15112, CVE-2026-15129)”.

**Last updated:** 2026-07-10

## What is CVE-2026-15121?

Use after free in WebRTC in Google Chrome prior to 150.0.7871.115 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)

The record classifies CVE-2026-15121 under weakness class [CWE-416](https://intel.threadlinqs.com/cwe/CWE-416). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 112 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.5% probability of exploitation in the next 30 days, higher than 42.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 8.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-08, last modified 2026-07-10

## Is CVE-2026-15121 being exploited?

Weaponised exploit code for CVE-2026-15121 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-15121.md) (trickest)

## Affected products and versions

- [Google](https://intel.threadlinqs.com/vendors/google): Chrome

## How to fix CVE-2026-15121

No vendor patch reference has been recorded for CVE-2026-15121 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-15121

1 tracked threat in the Threadlinqs corpus references CVE-2026-15121, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Google Chrome 150.0.7871.114/.115 Patches 27 Vulnerabilities Including Two Critical Use-After-Free Flaws (CVE-2026-15112, CVE-2026-15129)](https://intel.threadlinqs.com/threat/TL-2026-1173) — HIGH · 2026-07-10

## Sources

Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [chromereleases.googleblog.com](https://chromereleases.googleblog.com/2026/07/stable-channel-update-for-desktop_01162222768.html)
- [issues.chromium.org](https://issues.chromium.org/issues/523712556)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-15121
Full detection coverage and IOCs for threats exploiting CVE-2026-15121 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp