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5.3

Google Chrome may leak data to nearby attackers

CVE-2026-121039 · published 1 day ago
Summary

Versions of Google Chrome before 157.0.8103.38 can be tricked into sending private information to a nearby attacker who controls the network. This happens because the browser does not correctly check who is allowed to use a proxy. Update Chrome to the latest version to stop this risk.

What to do
  • Update google chrome to version 157.0.8103.38 or later.
Affected software
Ecosystem VendorProductAffected versions
– google chrome < 157.0.8103.38
Debian:12 debian chromium All versions
Original advisory text
Incorrect authorization in Proxy Auth in Google Chrome prior to 157.0.8103.38 allowed an adjacent attacker to obtain sensitive information via crafted network traffic. (Chromium security severity: ...
Incorrect authorization in Proxy Auth in Google Chrome prior to 157.0.8103.38 allowed an adjacent attacker to obtain sensitive information via crafted network traffic. (Chromium security severity: Medium)
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
5.3 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-863Incorrect Authorization
Timeline
Published3 Nov 2026
Updated4 Nov 2026
First seen3 Nov 2026
Sources
CVE-2026-121039 · NVD
CVE-2026-121039 · MITRE
DEBIAN-CVE-2026-121039 · OSV
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