Security readout for executives and security teams
Plain-English summary
A memory-safety flaw in Chrome’s WebSocket handling could let a remote attacker use a malicious webpage to escape the browser sandbox. The supplied CVSS score is 9.6, although Chromium rates the issue Low. User interaction is required, and the sources do not establish active exploitation.
Executive priority
Treat this as an expedited browser update, especially for privileged users and sensitive environments. The potential impact is serious, but Chromium’s Low rating, required interaction, and lack of documented active exploitation do not support declaring an incident solely from this CVE.
Technical view
CVE-2026-17947 is a use-after-free vulnerability (CWE-416) in Chrome WebSockets. A crafted HTML page could potentially trigger a sandbox escape on Chrome versions before 151.0.7922.72. The CVSS vector indicates network reachability, low complexity, no privileges, required user interaction, changed scope, and high potential impact.
Likely exposure
Endpoints running Chrome earlier than 151.0.7922.72 are potentially exposed when users encounter attacker-controlled HTML. Actual organizational exposure depends on browser versions, update enforcement, and browsing controls. The supplied affected-version field is inconsistent with the description and should be verified against Google’s advisory.
Exploitation context
The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation. Exploitation requires user interaction with crafted HTML. Public exploit availability, attack prevalence, and reliable exploitation conditions are not established by the supplied sources.
Researcher notes
The severity evidence conflicts: CVSS is critical at 9.6, while Chromium labels the vulnerability Low. The bundle also lists 151.0.7922.72 as affected despite describing versions prior to it as vulnerable. Validate release semantics with Google before building detection or compliance logic.
Mitigation direction
- Update Chrome to 151.0.7922.72 or later following Google’s guidance.
- Prioritize internet-facing user workstations and systems handling sensitive data.
- Enforce browser auto-updates and investigate devices that cannot receive the fixed release.
- Apply organizational web-filtering controls while delayed systems await remediation.
Validation and detection
- Inventory Chrome versions and identify installations earlier than 151.0.7922.72.
- Confirm managed devices successfully restarted Chrome after receiving the update.
- Verify update policies are enforced and detect endpoints with stalled update channels.
- Review Google’s advisory for revised affected-version or mitigation information.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-17947 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H2.86CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://chromereleases.googleblog.com/2026/07/stable-channel-update-for-desktop_0887107924.htmlCVE reference, Chrome
- https://issues.chromium.org/issues/515438256CVE reference, Chrome
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.