CVE-2025-6554
CVE-2025-6554 is a security flaw in Chrome and other Chromium browsers, the JavaScript engine inside Chrome, Edge, Brave, Opera and other Chromium browsers. A booby-trapped web page can corrupt memory in Chrome and other Chromium browsers, which attackers use to take it over. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 2 Jul 2025.[1]
Chrome and other Chromium browsers is in things households have, such as phones, computers, browsers and everyday apps, so the fix matters at home as much as at work. Fixed in version 138.0.7204.96 of Chrome.
Description
CISA calls it a type confusion in Google Chromium V8. In its words: “Google Chromium V8 contains a type confusion vulnerability that could allow a remote attacker to perform arbitrary read/write via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.”[1]
The underlying weakness is type confusion (CWE-843), in MITRE’s list of common software weaknesses.[2]
It scores 8.1 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by the organisation that published the CVE using CVSS 3.1.[2]
Affected versions
NVD’s record lists one fixed version: everything before it is affected.[2]
| Product | Fixed in |
|---|---|
| Chrome | 138.0.7204.96 |
Every device with Chrome and other Chromium browsers needs the update.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 2 Jul 2025, 2 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 23 Jul 2025 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 14%. That’s in the top 4% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
Google has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Update Chrome and other Chromium browsers now.Chrome updates itself, but only finishes when you restart it: open the menu, choose Help, then About Google Chrome, and click Relaunch. Edge, Brave, Opera and Vivaldi need the same. Then turn on automatic updates, so the next fix arrives on its own.
- Check you’re on 138.0.7204.96 or later.Fixed in version 138.0.7204.96 of Chrome. Anything older is what attackers are going after.
- If there’s no update, stop using it.CISA’s advice when a flaw being used in attacks has no fix is to stop using the product until it does.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 8.1.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 14%.[4] |
See also
Other Chrome and other Chromium browsers flaws
- CVE-2026-87491: out of bounds write ·
- CVE-2026-85046: type confusion ·
- CVE-2026-11645: out-of-bounds read and write ·
- CVE-2026-3910: improper restriction of operations within the bounds of a memory buffer ·
- CVE-2025-13223: type confusion ·
- CVE-2025-10585: type confusion ·
Other type confusion flaws
- CVE-2026-21519, Microsoft Windows: type confusion ·
- CVE-2025-30397, Microsoft Windows: scripting engine type confusion ·
- CVE-2024-38178, Microsoft Windows: scripting engine memory corruption ·
- CVE-2024-23222, Apple devices: webKit type confusion ·
- CVE-2023-32439, Apple devices: webKit type confusion ·
Every Google flaw on CISA’s list · Everything added in July 2025
References
- ^ Cybersecurity and Infrastructure Security Agency. “Google Chromium V8 Type Confusion Vulnerability”. Known Exploited Vulnerabilities Catalog, added 2 Jul 2025.
- ^ National Institute of Standards and Technology. “CVE-2025-6554 Detail”. National Vulnerability Database, published 30 Jun 2025.
- ^ Google. Advisories and fixes: chromereleases.googleblog.com, chromereleases.googleblog.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.141, percentile 96.6, 31 Oct 2026.
- CVE Program. “CVE-2025-6554”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.