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High

Use-after-free in PDFium in Google Chrome

IdentifiersCVE-2026-11303CWE-416· Use After Free

CVE-2026-11303 is a use-after-free vulnerability in PDFium, the PDF rendering component used by Google Chrome, affecting Chrome versions prior to 149.0.7827.53. The flaw can be triggered when a target processes a crafted PDF file, leading to memory corruption. According to the provided sources, successful exploitation allows a remote attacker to execute arbitrary code inside the Chrome sandbox. The issue is described by Chromium as low severity, but the available metadata classifies it as CWE-416 and associates it with a CVSS v3.1 vector of AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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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 can result in arbitrary code execution within the browser's sandboxed renderer context while processing a malicious PDF. This gives an attacker the ability to compromise the affected browser process and cause memory corruption, with potential impacts including application compromise, denial of service, and access to data available within that sandboxed context. The provided information does not indicate a sandbox escape or direct system-level code execution.

Mitigation

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

No specific workaround or temporary mitigation is provided in the supplied content. The practical mitigation is to update affected browsers to the latest fixed version. Where immediate patching is not possible, reducing exposure to untrusted PDF content may lower risk, but this is not stated as an official vendor mitigation in the provided material.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 149.0.7827.53 or later. For Microsoft Edge (Chromium-based), update to version 149.0.4022.52 or later, which is documented as incorporating the Chromium fix. Debian users should upgrade chromium to the fixed package versions identified by their distribution advisory, including 149.0.7827.53-1~deb12u1 for bookworm and 149.0.7827.53-1~deb13u1 for trixie.
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

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

5 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

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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 activity4

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-11303
NVD
nvd.nist.gov/vuln/detail/CVE-2026-11303
MITRE CWE · CWE-416
Use After Free
Release Notes
chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html
Permissions Required
issues.chromium.org/issues/504416752