CVE-2026-19558: Chromium: CVE-2026-19558 Use after free in Extensions
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.
CSIRTS triage
- What
- Use-after-free vulnerability in Extensions engine inherited from Chromium.
- Who is affected
- Microsoft Edge users with extensions enabled, running affected Chromium-based versions.
- Urgency
- Moderate to high; use-after-free in extensions can lead to code execution.
- Action
- Update Microsoft Edge to a version that includes the latest Chromium security patch.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-19558
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-195580.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-19558 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownMicrosoft Edge Multiple Vulnerabilitieshkcert
- high[NEW] [high] Google Chrome: Multiple Vulnerabilities Enable Unspecified Attackcert-bund
- unknownDSA-6436-1 chromium - security updatedebian
- unknownGoogle Chrome Multiple Vulnerabilitieshkcert
- unknownMultiple vulnerabilities in Google Chrome (August 12, 2026)cert-fr-avis
- highCVE-2026-19558: Use after free in Extensions in Google Chrome prior to 151.0.7922.137 allowed an attacker who …nvd
Recent advisories for Chromium
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-72970: Heap-based buffer overflow in Microsoft Edge (Chromium-based) allows an unauthorized attacker …nvd · 2026-08-14
- unknownDSA-6436-1 chromium - security updatedebian · 2026-08-13
- highPAN-SA-2026-0011 Chromium: Monthly Vulnerability Update (August 2026) (Severity: HIGH)paloalto · 2026-08-12
- highCVE-2026-19560: Use after free in Blink in Google Chrome prior to 151.0.7922.137 allowed a remote attacker to …nvd · 2026-08-11
- highCVE-2026-19559: Use after free in HTML in Google Chrome prior to 151.0.7922.137 allowed a remote attacker to e…nvd · 2026-08-11
- highCVE-2026-19556: Use after free in V8 in Google Chrome prior to 151.0.7922.137 allowed a remote attacker to exe…nvd · 2026-08-11
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