CVE-2026-14071: Chrome WebAudio Side-Channel Data Leakage (CVSS 6.5)

Technical summary

CVE-2026-14071 exploits a side-channel information leakage flaw in Chromium's WebAudio implementation (CWE-1300, CWE-203). The vulnerability enables cross-origin data exfiltration via timing or resource-based side channels accessible through the WebAudio API. An attacker crafts a malicious HTML page that, when visited by a victim, measures WebAudio processing characteristics to infer or reconstruct sensitive data from other origins. The attack surface includes any site that can load and interact with WebAudio contexts. Chromium rated the severity as Low internally, though the CVSS v3.1 score of 6.5 (MEDIUM) reflects the confidentiality impact and network-based attack vector.

Business impact

This vulnerability exposes organizations to data exfiltration attacks without requiring code execution or authentication. Users who visit compromised or attacker-controlled sites risk leakage of information from concurrent sessions on other domains—potentially including authentication tokens, personal data, or application state. For SaaS providers and web applications handling sensitive data, the risk is elevated if users may visit untrusted content in the same browser context. Remediation is straightforward through patching, but the attack requires no special privileges or complex exploitation, making user awareness and timely updates critical.

Affected systems

The vulnerability affects Google Chrome on Windows, macOS, and Linux. All Chrome versions prior to 150.0.7871.47 are vulnerable. Users on these operating systems should verify their current Chrome version and apply the patch immediately. No evidence indicates that other Chromium-based browsers (Edge, Brave, Opera) are affected by this specific WebAudio side-channel, but vendors should confirm their WebAudio implementations independently.

Exploitability

Exploitability is moderate. An attacker must host a malicious webpage and convince a user to visit it (via phishing, social engineering, or malvertising). No zero-click exploitation vector has been documented. Once the victim loads the page, the WebAudio side-channel can be triggered passively without further user interaction. Exploit code is not in public circulation, and the vulnerability is not tracked in CISA's Known Exploited Vulnerabilities catalog. However, the straightforward nature of side-channel measurement techniques means exploitation tools could be quickly developed by threat actors.

Remediation

Update Google Chrome to version 150.0.7871.47 or later immediately. The Chrome auto-update mechanism typically deploys patches within hours of release; verify completion via Chrome Settings > About > Chrome. Enterprise administrators should use Chrome policies to enforce rapid deployment across endpoints. No workarounds exist for unpatched versions, but the risk can be partially mitigated by restricting visits to untrusted domains and disabling JavaScript in high-risk browsing contexts.

Patch guidance

Google Chrome 150.0.7871.47 contains the fix for this WebAudio side-channel vulnerability. Patches are released automatically via Chrome's built-in updater; most users will receive the fix without manual intervention. Windows, macOS, and Linux users should all verify they are on version 150.0.7871.47 or newer by navigating to chrome://settings/help. Enterprise deployments using Windows Group Policy or macOS configuration profiles should ensure Chrome version policies are set to accept the stable channel release. No beta or pre-release versions are required; the stable release contains the complete remediation.

Detection guidance

Detection at the network level is challenging, as the side-channel operates within the browser WebAudio API and does not generate distinctive external signatures. Endpoint detection should focus on Chrome version inventory and patch compliance monitoring. Web servers and applications can log unusual or suspicious WebAudio API usage patterns, though false positives are likely. Security teams should prioritize patch deployment verification over behavioral detection. Browser isolation or sandboxing solutions can provide defense-in-depth by limiting cross-origin data exposure even if the vulnerability is not immediately patched.

Why prioritize this

Despite Chromium's internal Low severity rating, this vulnerability warrants HIGH priority patching for two reasons: (1) the CVSS score of 6.5 reflects genuine confidentiality impact across all users, and (2) side-channel attacks are difficult for end users to detect or defend against directly. Organizations with sensitive web applications, authentication systems, or users handling regulated data should treat this as critical. The short time-to-exploit and ease of delivery via web content make rapid patching essential before threat actors weaponize it at scale.

Risk score, explained

The CVSS v3.1 score of 6.5 (MEDIUM) reflects: Attack Vector: Network (exploitable remotely), Attack Complexity: Low (no special setup required), Privileges Required: None, User Interaction: Required (victim must visit attacker page), Scope: Unchanged (cross-origin but within same browser context), Confidentiality: High (sensitive data exposure), Integrity: None, Availability: None. The discrepancy between Chromium's internal Low rating and the CVSS MEDIUM score stems from the broader scope of CVSS modeling; the MEDIUM rating appropriately emphasizes the real-world risk to confidentiality despite lower complexity.

Frequently asked questions