Google Chrome: attackers can run their own code
OFFICIAL NAME: Google Chromium Use-After-Free Vulnerability
WHAT IT IS · COMPUTERS, PHONES AND BROWSERSIt runs on staff computers, phones or browsers.
DO THIS FIRSTInstall the latest updates on every device, and turn on automatic updates. Not sure if you use it? Send this page to your IT provider or security lead and ask.
TECHNICAL SUMMARY Use after free in XML in Google Chrome prior to 157.0.8103.50 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)
WHY THIS VERDICT Attacks are confirmed. The vulnerability is new today, so almost nothing is patched yet.
WHY IT RANKS HERE Exploitation is confirmed by an authoritative source. The confirmation is 1 day old.
- HIGHEST CONFIRMED RUNG
- EXPLOITED
- CISA KEV
- LISTED
- EXPLOIT CODE
- PROOF OF CONCEPT
How far has it climbed?
01 TALK
■ CONFIRMEDNEWEST EVIDENCE · 4 INDEPENDENT SOURCESCVE-2026-125350 discussed publicly (CIRCL sighting). CVE-2026-125350 discussed publicly (CIRCL sighting).
- SRC: CIRCL Vulnerability-Lookup sightings: CVE-2026-125350 discussed publicly (CIRCL sighting) · NOV 10
- SRC: The Register (security): Chrome zero-day whack-a-mole continues as 2026 tally hits 8 · NOV 10
- SRC: Security Affairs: Google fixes the eighth actively exploited Chrome zero-day of 2026 · NOV 10
- SRC: The Hacker News: Google Issues Chrome Security Update for Eighth Actively Exploited Zero-Day of 2026 · NOV 9
02 EXPOSED
□ NOT TRACKED YETNO SOURCE FOR THIS STEP YETWe have no source that counts exposed systems yet. Internet scan data needs a partnership we do not have. No evidence here does not mean nothing is exposed.
03 TRIED
■ CONFIRMEDNEWEST EVIDENCE · 3 INDEPENDENT SOURCESAttacks that worked are confirmed (step 4), so attempts count as confirmed too.
- SRC: CIRCL Vulnerability-Lookup sightings: Exploitation of CVE-2026-125350 reported (CIRCL sighting) · NOV 10
- SRC: CVE List V5 and CISA Vulnrichment: CISA Vulnrichment marks CVE-2026-125350 as actively exploited · NOV 10
- SRC: CISA Known Exploited Vulnerabilities: Google Chromium Use-After-Free Vulnerability · NOV 9
04 EXPLOITED
■ CONFIRMEDNEWEST EVIDENCE · 3 INDEPENDENT SOURCESExploitation of CVE-2026-125350 reported (CIRCL sighting). CISA Vulnrichment marks CVE-2026-125350 as actively exploited.
- SRC: CIRCL Vulnerability-Lookup sightings: Exploitation of CVE-2026-125350 reported (CIRCL sighting) · NOV 10
- SRC: CVE List V5 and CISA Vulnrichment: CISA Vulnrichment marks CVE-2026-125350 as actively exploited · NOV 10
- SRC: CISA Known Exploited Vulnerabilities: Google Chromium Use-After-Free Vulnerability · NOV 9
05 DAMAGE
□ NOT TRACKED YETNO SOURCE FOR THIS STEP YETBreach notices and filings rarely name the flaw that was used, so we cannot link them to this event yet. No evidence here does not mean no harm.
When each thing happened
- DISCLOSED
- EXPLOIT CODE PUBLIC
- FIRST ATTACK REPORT
- CISA KEV LISTING
- US FEDERAL DEADLINE
THE FIX
CISA's instruction: apply the vendor's fix, or stop using the product if no fix exists. CISA set Nov 24, 2026 as the deadline for US federal agencies. It is a US government deadline; use it as a guide.
Questions to ask this week
- Do we run Google Chrome? If yes, is it patched or cut off from the internet?
- Who owns fixing it, and by what date?
- Have we checked for signs of attack since the first report, not just since the patch?
How it unfolded
- Attack activity. NOV 9, 2026Google Chromium Use-After-Free Vulnerability
- NOV 9, 2026Google Issues Chrome Security Update for Eighth Actively Exploited Zero-Day of 2026
- Attack activity. NOV 9, 2026Exploitation of CVE-2026-125350 reported (CIRCL sighting) (3 reports, latest NOV 10)
- NOV 10, 2026CVE-2026-125350 discussed publicly (CIRCL sighting) (50 reports)
- NOV 10, 2026Google fixes the eighth actively exploited Chrome zero-day of 2026
- NOV 10, 2026Chrome zero-day whack-a-mole continues as 2026 tally hits 8
- NOV 10, 20261 public GitHub repository claims a proof of concept for CVE-2026-125350
- Attack activity. NOV 10, 2026CISA Vulnrichment marks CVE-2026-125350 as actively exploited
- NOV 10, 2026Public proof of concept for CVE-2026-125350 (CIRCL sighting)
SOURCES
- [1] CIRCL Vulnerability-Lookup sightings: CVE-2026-125350 discussed publicly (CIRCL sighting), NOV 10
- [2] CIRCL Vulnerability-Lookup sightings: Exploitation of CVE-2026-125350 reported (CIRCL sighting), NOV 10
- [3] CIRCL Vulnerability-Lookup sightings: Public proof of concept for CVE-2026-125350 (CIRCL sighting), NOV 10
- [4] CVE List V5 and CISA Vulnrichment: CISA Vulnrichment marks CVE-2026-125350 as actively exploited, NOV 10
- [5] PoC-in-GitHub: 1 public GitHub repository claims a proof of concept for CVE-2026-125350, NOV 10
- [6] The Register (security): Chrome zero-day whack-a-mole continues as 2026 tally hits 8, NOV 10
- [7] Security Affairs: Google fixes the eighth actively exploited Chrome zero-day of 2026, NOV 10
- [8] The Hacker News: Google Issues Chrome Security Update for Eighth Actively Exploited Zero-Day of 2026, NOV 9
- [9] CISA Known Exploited Vulnerabilities: Google Chromium Use-After-Free Vulnerability, NOV 9
- [10] CIRCL Vulnerability-Lookup sightings: 51 more reports