Chrome V8 Zero-Day Exploited in the Wild Enables Code Execution Inside Sandbox
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- EPSS
- 0%
Key insight
An actively exploited V8 flaw enables code execution within Chrome's sandbox, which could facilitate escalation to system level.
Description
CVE-2026-87491 is an out-of-bounds write in Google's V8 JavaScript engine that allows attackers to execute arbitrary code within Chrome's sandbox via a crafted HTML page. The vulnerability is already being exploited in the wild and was discovered by Jihyeon Jeong of Seoul National University. Google released a patch in Chrome 153.0.8010.36/.37. Chromium-based browsers including Microsoft Edge, Brave, Opera, and Vivaldi are similarly affected and require corresponding updates. Although rated medium severity, active exploitation and sandbox-bypass potential demand immediate attention.
Risk score
- cvss base
- 0.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 15.00
- raw before weight
- 15.00
- industry weight
- 1.10
- freshness factor
- 1.00
- exploitability factor
- 1.00
- days old
- 0.00
- vendor mismatch penalty
- 0.00
- consensus penalty
- -3.00
Path: operational
Consensus check
The pipeline self-checks before delivery. These rules lowered the score:
-
TTP_SKIPPEDTTP mapping skipped (placeholder or aggregation article) −3
- Consensus penalty:
- −3.0
- Total penalty:
- −3.0