Google · Memory corruption
Chromium CVE-2026-126885: Use after free
At a glance
~0.4% estimated chance of attack in 30 days. Exploitation not confirmed.
Low rather than Medium: UK relevance is 40 of 100, little UK-specific signal so far.
Briefing
- IT leaders should verify if Chromium-based browsers are in their estate and monitor for updates related to CVE-2026-126885.
Questions to ask IT
- Do we run Microsoft Edge and Google Chrome, and is every instance on version 157.0.8103.78 or later?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 13 Dec?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-126885- 9.6 · CriticalExploitable over the network without any account, but only if a user takes an action, such as opening a file or link. High impact on confidentiality, integrity and availability, and it can reach beyond the vulnerable system.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- Not listed
- ~0.4% estimated chance of attack in 30 days
- Before 157.0.8103.78
- 157.0.8103.78
Versions are as the CVE record states them; check the vendor advisory before planning a fix.
- Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Further details can be found in the Google Chrome Releases blog post.
Next steps
- Review the advisory against your asset inventory and patch cadence
Summary
- Chromium CVE-2026-126885 is a use-after-free vulnerability that affects Chromium-based browsers, including Microsoft Edge, according to a probable claim.
- The vulnerability is identified as CVE-2026-126885 and has been confirmed by the provided evidence.
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Products and services involved
- Microsoft Edge98% match confidence · CVE-2026-126885
- Google Chrome98% match confidence · CVE-2026-126885
Pulse
Last change 2h ago · Next recheck 14 Nov 2026, 23:11 UK time
- Story13 Nov 2026, 23:11 UK time · 2h ago
Linked reporting from Microsoft Security Update Guide RSS (vendor psirt).
Read source (Microsoft Security Update Guide RSS)
1 entry so far. The timeline chart appears once this story has more history.
Sources
Chromium CVE-2026-126885: Use after free
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Chromium CVE-2026-126885: Use after free
- ProbableSummary fact75% confidence
Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see [Google Chrome Releases](https://chromereleases.googleblog.com/2026) for more information.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-126885
- ConfirmedEstimated attack likelihood95% confidence
CVE-2026-126885 has an estimated ~0.4% chance of attack in 30 days (31.9th percentile) as of 2026-11-13 — probability signal, not confirmed exploitation