Use-after-free in Google Chrome Proxy via crafted PAC script
CVE-2026-9887 is a critical use-after-free vulnerability in the Proxy component of Google Chrome affecting versions prior to 148.0.7778.216. According to the provided content, the flaw can be triggered by a remote attacker via a crafted PAC (Proxy Auto-Configuration) script. The vulnerability arises from improper lifetime management of memory in the Proxy component, leading to a stale pointer dereference after the underlying object has been freed. Successful exploitation may allow arbitrary code execution in the context of the browser process handling the vulnerable component.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
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The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.