CVE-2026-9911: Integer Overflow in Chrome ANGLE Graphics Library – Information Disclosure Vulnerability

Technical summary

An integer overflow vulnerability exists in ANGLE (Almost Native Graphics Layer Engine), the graphics abstraction layer integrated into Google Chrome. The flaw permits out-of-bounds memory reads when processing specially crafted HTML content. The attack surface is network-accessible; an attacker need only convince or trick a user into visiting a hostile webpage. No privilege escalation or local access is required. The vulnerability is classified as High severity by the Chromium security team but scored CVSS 3.1 as MEDIUM (4.3) because exploitation yields information disclosure without enabling code execution or availability impact.

Business impact

This vulnerability primarily threatens data confidentiality. Affected organizations face risk of credential leakage, session token exposure, or exfiltration of sensitive cached data when employees browse untrusted websites. In targeted scenarios—such as phishing campaigns aimed at high-value targets—attackers could selectively harvest authentication material or personal identifiable information. The attack is neither wormable nor self-propagating, limiting blast radius, but the low barrier to user infection and potential for targeted campaigns warrant prompt patching in security-conscious environments.

Affected systems

Google Chrome versions prior to 148.0.7778.216 are vulnerable. ANGLE is bundled with Chrome on all platforms (Windows, macOS, Linux, Android, iOS). Enterprise deployments running unpatched Chrome builds face exposure. Other Chromium-based browsers that share the same ANGLE codebase may also be affected, though vendors' patch timelines vary. Verify your specific browser versions and update status against the vendor advisory.

Exploitability

The vulnerability requires user interaction—a visit to an attacker-controlled or compromised webpage—making this a drive-by infection vector rather than remote code execution without user action. No authentication, special network position, or advanced capabilities are needed beyond crafting malicious HTML. However, the attack does not break the browser sandbox or grant attacker code execution, limiting damage to information disclosure. The low CVSS score reflects this constrained impact; Chromium's High severity designation acknowledges the privacy breach risk despite bounded technical severity.

Remediation

Update Google Chrome to version 148.0.7778.216 or later immediately. Automatic updates are enabled by default in Chrome; users can manually verify updates via Menu > About Google Chrome. For enterprise deployments using managed Chrome policies, deploy the patched version through your MDM or group policy framework. Interim mitigations—such as restricting browsing to known-safe sites or disabling JavaScript—reduce attack surface but are not substitutes for patching. No workarounds fully eliminate the risk.

Patch guidance

Apply Chrome version 148.0.7778.216 or any subsequent release. Most users will receive the patch automatically within days of the update's availability. Enterprise administrators should prioritize this patch in their update cycle, though the low CVSS score (4.3) may permit scheduling within standard maintenance windows if immediate deployment conflicts with change control. Verify successful patching by navigating to chrome://version and confirming the version number. Consider forcing an update check via chrome://settings/about if manual verification shows an older build.

Detection guidance

Monitor endpoint telemetry for Chrome processes interacting with untrusted or anomalous URLs, particularly HTML files from unexpected sources. Host-based detection is inherently limited since the attack leaves minimal forensic traces; focus on user awareness to prevent initial infection. Network-level detection of malicious HTML may be possible if the attack payload exhibits recognizable patterns, but this is difficult given the exploit's simplicity. Post-incident, inspect Chrome's cache, cookies, and autofill data for unexpected entries or access patterns. Consider enabling Chrome Enterprise alerting if your organization runs managed Chrome for early vulnerability notifications.

Why prioritize this

Although the CVSS score is MEDIUM (4.3), this vulnerability merits rapid patching due to its low exploitation friction and direct privacy impact. It is not listed on the KEV Catalog, indicating no current evidence of active exploitation in the wild, but the attack's simplicity suggests real-world proof-of-concepts may appear quickly. Organizations handling sensitive customer data, credentials, or personal information should prioritize this patch within their first update cycle. Smaller organizations or those with less sensitive workloads may defer to the next standard patch window.

Risk score, explained

The CVSS 3.1 score of 4.3 (MEDIUM) reflects limited scope: the vulnerability requires user interaction (CVSS UI:R), can only be exploited over the network (AV:N) with low attack complexity (AC:L), no privilege escalation (PR:N), and yields only confidentiality impact (C:L) without affecting integrity or availability (I:N/A:N). The CWE-472 classification (Integer Overflow or Wraparound) identifies the root cause. Chromium's High severity designation acknowledges the privacy risk and attack ease despite the bounded technical impact; the two ratings are not contradictory—one reflects potential privacy harm, the other a constrained threat model.

Frequently asked questions