CVE-2026-9887: Use after free in Proxy
Chromium: CVE-2026-9887 Use after free in Proxy
Other sources
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.
— Microsoft
Use after free in Proxy in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code via a crafted PAC script. (Chromium security severity: Critical)
— NVD
Credit
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
alpine/qt6-qtwebengineto a version that resolves this vulnerability.Fixed in 6.11.1-r2 - Upgrade
Upgrade
debian/chromiumto a version that resolves this vulnerability.Fixed in 150.0.7871.100-1~deb12u1Fixed in 156.0.8078.79-1~deb12u1Fixed in 150.0.7871.181-1~deb13u1Fixed in 156.0.8078.79-1~deb13u1Fixed in 156.0.8078.79-1 - Upgrade
Upgrade
Google Chrome / Chromium Proxyto a version that resolves this vulnerability.Fixed in 148.0.7778.216
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2026-9887?
The severity of CVE-2026-9887 is classified as high with a CVSS score of 8.8.
How do I fix CVE-2026-9887?
To fix CVE-2026-9887, update Google Chrome to version 148.0.7778.216 or later.
What type of vulnerability is CVE-2026-9887?
CVE-2026-9887 is a use after free vulnerability found in the Proxy component of Chromium.
Which software is affected by CVE-2026-9887?
CVE-2026-9887 affects Google Chrome prior to version 148.0.7778.216 and Microsoft Edge (Chromium-based) versions that include the affected Chromium.
When was CVE-2026-9887 published?
CVE-2026-9887 was published on May 8, 2026.