Vulnerability · Published Nov 3, 2026 · Assigned by Chrome
CVE-2026-121217
High 7.5
In plain English
A high-severity use-after-free in Chrome from Google. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.1%top 97.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Use after free in Streaming in Google Chrome prior to 157.0.8103.38 allowed an adjacent attacker to execute arbitrary code inside the sandbox via crafted network traffic. (Chromium security severity: Low)
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | chromium | no fix listed | DEBIAN-CVE-2026-121217 |
| Debian:13 | chromium | no fix listed | DEBIAN-CVE-2026-121217 |
| Debian:14 | chromium | no fix listed | DEBIAN-CVE-2026-121217 |
Affected products (as reported)
Weakness: CWE-416 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H