CVE-2026-16632 Details
Description
A flaw has been found in boazsegev facil.io up to 0.7.4. Affected is the function websocket_on_protocol_error in the library lib/facil/http/parsers/websocket_parser.h of the component WebSocket Frame Parser. This manipulation of the argument on_message causes improper input validation. The attack can be initiated remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
A vulnerability exists in facil.io versions through 0.7.4 within the WebSocket frame parser. The issue arises in the 'websocket_on_protocol_error' function, where unmasked client frames are improperly handled. Although the parser detects the protocol error, it fails to halt processing, allowing invalid frame payloads to be delivered to the application's 'on_message' callback before the connection is closed. This flaw enables remote attackers to execute one application-level action per connection using frames that should have been rejected.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 23, 2026CISA-ADP
Assessed Jul 23, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://vuldb.com/submit/860585 | CISA-ADP | Issue TrackingPermission Required |
| https://github.com/boazsegev/facil.io/ | [email protected] | Vendor |
| https://github.com/boazsegev/facil.io/issues/169 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://vuldb.com/cve/CVE-2026-16632 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/860585 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/382382 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/382382/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| boazsegev facil.io | <= 0.7.4 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Modified | CISA-ADP |
| Jul 23, 2026 | New CVE Received | [email protected] |