CVE-2026-9959

LOWNVD 3.1Trending — 3 sources updated this week

3.1

Race in WebRTC in Google Chrome on Windows prior to 148.0.7778.216 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

CVSS v3: 3.1
EG Score: 0.0(none)
EPSS: 7.3%
KEV: Not listed

Published

May 28, 2026

Last Modified

May 29, 2026

References (2)

chrome-cve-admin@googlehttps://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
chrome-cve-admin@googlehttps://issues.chromium.org/issues/504557432

Vendor Advisories for CVE-2026-9959(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

GHSA-fpq5-2g76-9w95
GitHub Security AdvisoriesLow
Race in WebRTC in Google Chrome on Windows prior to 148.0.7778.216 allowed a remote attacker to...

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

Data Freshness Timeline

(refreshed 6× in last 7d / 6× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-01 00:55 UTCEG score recompute▲ 3.10
2026-06-01 00:55 UTCGHSA enrichment
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 22:51 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-9959?

CVE-2026-9959 is a low vulnerability published on May 28, 2026. Race in WebRTC in Google Chrome on Windows prior to 148.0.7778.216 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

When was CVE-2026-9959 disclosed?

CVE-2026-9959 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on May 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-9959 actively exploited?

CVE-2026-9959 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-9959?

CVE-2026-9959 has a CVSS v3 base score of 3.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.

How do I remediate CVE-2026-9959?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9959, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-9959

📅 Published

🔄 Last Modified

🔗 References (2)

📣 Vendor Advisories for CVE-2026-9959(1)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)