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No exploitation reportedAwaiting NVD analysis

CVE-2026-121217

Use-after-free in Chrome Streaming Allows Sandboxed Code Execution via Crafted Network Traffic

No exploitation reported by the sources we read.

  • Published2026-11-03
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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)

Timeline

dates in UTC
  1. 2026-11-0320:42CVE publishedCNA

Versions per branch

Products declared by the CNA1 product

As Chrome, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Google Chrome
    Affected
    • ≥ 157.0.8103.38, < 157.0.8103.38fixed in 157.0.8103.38custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-03

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • chromiumEchoall versions · no fixed version listed
  • chromiumDebian:14all versions · no fixed version listed
  • chromiumDebian:13all versions · no fixed version listed
  • chromiumDebian:12all versions · no fixed version listed

Vendor advisories

  • CVE-2026-121217 Red Hat Product Security

    chromium-browser: Use after free in Streaming

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-11-03
Last Modified
2026-11-04
NVD status
Undergoing Analysis
GitHub Advisory
GHSA-fgh2-xv6h-w6w3

Frequently asked questions

What is CVE-2026-121217?

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)

Is CVE-2026-121217 actively exploited?

Active exploitation of CVE-2026-121217 has not been confirmed. Its EPSS score was 0.1% on 2026-11-04, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-121217?

CVE-2026-121217 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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