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CVE-2026-113321 Google CVE debrief

CVE-2026-113321 debrief based on CVE Program and NVD records. Google Chrome users should assess exposure to version 156.0.8078.47 and earlier. The CVE record was published on 2026-10-20T21:02:12.695Z and has not been modified since then. This use-after-free vulnerability in Google Chrome Extensions allows remote attackers to execute arbitrary code inside the sandbox via a crafted HTML page. Chrome users should verify their version and update to 156.0.8078.47 or later. Security teams should review and enforce policies for Chrome Extensions.

Vendor
Google
Product
Chrome
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-20
Original CVE updated
2026-10-21
Advisory published
2026-10-20
Advisory updated
2026-10-21

Who should care

Google Chrome users, particularly those with Chrome installed on their systems, should assess their exposure to this vulnerability and verify their Chrome version. Security teams should review and enforce policies for Chrome Extensions to prevent exploitation. Chrome users should verify their Chrome version and update to 156.0.8078.47 or later to mitigate this vulnerability.

Why it matters

CVE-2026-113321 is a use-after-free vulnerability in Google Chrome Extensions that allows remote attackers to execute arbitrary code inside the sandbox. Chrome users should verify their version and update to 156.0.8078.47 or later. Security teams should review and enforce policies for Chrome Extensions.

  • Remote attackers may execute arbitrary code inside the Chrome sandbox
  • Chrome users may be vulnerable to exploitation via crafted HTML pages
  • Verification of Chrome version and updates is necessary
  • Security policies for Chrome Extensions should be reviewed and enforced

Technical summary

A use-after-free vulnerability exists in Google Chrome Extensions prior to version 156.0.8078.47. This vulnerability allows a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. The vulnerability is rated as Medium by Chromium security severity. Chrome users should verify their Chrome version and update to the latest version to mitigate this vulnerability. Security teams should review and enforce policies for Chrome Extensions to prevent exploitation. Chrome users may be vulnerable to exploitation via crafted HTML pages.

Defensive priority

Medium priority for Chrome users to verify and update to the latest version.

Recommended defensive actions

  • Verify Chrome version and update to 156.0.8078.47 or later
  • Review and enforce security policies for Chrome Extensions
  • Monitor Chrome release notes for future updates
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD entry provide details on the use-after-free vulnerability in Google Chrome Extensions. Chromium security severity is rated as Medium. The vulnerability exists in Google Chrome Extensions prior to version 156.0.8078.47. This vulnerability allows a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. Chrome users should verify their Chrome version and update to the latest version.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-113321 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-113321

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

  • CVE-2026-113321 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-113321

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

Supplemental references

  • CVE-2026-113321

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/113xxx/CVE-2026-113321.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_02018666648.html

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://issues.chromium.org/issues/513521516

    Supplemental source

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.