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High

Use-after-free RCE in Google Chrome Base

IdentifiersCVE-2026-9883CWE-416· Use After Free

CVE-2026-9883 is a critical use-after-free vulnerability in the Base 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 using a crafted HTML page, leading to memory corruption in Chrome's Base infrastructure. While the specific vulnerable function is not disclosed in the provided material, the bug class and exploitation vector indicate that stale memory may be dereferenced after an object has been freed, creating conditions for controlled corruption and potential code execution within the browser process.

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ANALYST BRIEF

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.

Successful exploitation may allow a remote attacker to execute arbitrary code on the target system when a victim visits a maliciously crafted HTML page. Depending on runtime conditions and exploit reliability, this could result in full compromise of the affected browser process, follow-on exploitation for sandbox escape, theft of sensitive browser-accessible data, or installation of additional malware. The provided content classifies the Chromium severity as Critical.

Mitigation

If you can’t patch tonight, do this now.

No specific workaround is provided in the supplied content. The primary mitigation is prompt patching to a fixed Chrome/Chromium version. Until updates are fully deployed, defenders can reduce exposure by limiting access to untrusted websites, using browser sandboxing and application isolation controls, and monitoring for exploitation attempts involving malicious web content, but these measures are not substitutes for upgrading.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 148.0.7778.216 or later. For Debian Chromium, upgrade to the fixed package versions referenced in the advisory: 148.0.7778.215-1~deb12u1 for oldstable (bookworm) or 148.0.7778.215-1~deb13u1 for stable (trixie), as applicable. Apply the vendor-provided stable release as soon as it becomes available across managed endpoints.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
GoogleChromeapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

1 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-9883
NVD
nvd.nist.gov/vuln/detail/CVE-2026-9883
MITRE CWE · CWE-416
Use After Free
Release Notes
chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
Permissions Required
issues.chromium.org/issues/506477192