PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-9943 Google CVE debrief

A medium-severity out-of-bounds read vulnerability in WebGL on Google Chrome for Android, disclosed on 2026-05-28, enables remote attackers to leak cross-origin data via a crafted HTML page. The flaw was fixed in Chrome 148.0.7778.216. No known exploitation in ransomware campaigns has been reported.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-28
Original CVE updated
2026-07-21
Advisory published
2026-05-28
Advisory updated
2026-07-21

Who should care

Organizations with mobile workforces relying on Android devices, developers of web applications using WebGL, and security teams managing browser update cadences should prioritize patching.

Technical summary

CVE-2026-9943 is an out-of-bounds read (CWE-125) in the WebGL implementation of Google Chrome on Android. A remote attacker can exploit this flaw using a crafted HTML page to read memory outside intended bounds, resulting in leakage of cross-origin data. The vulnerability is remotely exploitable with user interaction (UI:R) and has a CVSS 3.1 score of 4.3 (Medium). Google assigned a High severity rating within the Chromium project. The fix is included in Chrome stable version 148.0.7778.216 for Android.

Defensive priority

medium

Recommended defensive actions

  • Update Google Chrome on Android to version 148.0.7778.216 or later.
  • Restrict or block untrusted HTML content and third-party iframe embedding where feasible.
  • Monitor for anomalous cross-origin data access patterns in WebGL contexts.
  • Review application Content Security Policy (CSP) and cross-origin resource sharing (CORS) configurations to limit data exposure.

Evidence notes

The CVE description states the vulnerability is an out-of-bounds read (CWE-125) in WebGL affecting Google Chrome on Android prior to version 148.0.7778.216, with Chromium security severity rated High. The CVSS v3.1 score is 4.3 (Medium). The NVD entry lists the vulnerability status as 'Undergoing Analysis' as of the source modified date of 2026-05-29. Vendor attribution is supported by Chrome release blog and Chromium issue tracker references.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9943 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9943

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-9943 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9943

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.