CVE-2026-16632 — boazsegev facil.io WebSocket Frame websocket_parser.h websocket_on_protocol_error input validation

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MEDIUM

boazsegev facil.io WebSocket Frame websocket_parser.h websocket_on_protocol_error input validation

Published Jul 22, 2026

6.9

MEDIUM

CVSS 4.0

EPSS 0.52%

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.

Affected products

Vendor Boazsegev Product Facil.io Default
n/a
- Version
  0.7.0
  Status
  affected
  Constraints
  -
- Version
  0.7.1
  Status
  affected
  Constraints
  -
- Version
  0.7.2
  Status
  affected
  Constraints
  -
- Version
  0.7.3
  Status
  affected
  Constraints
  -
- Version
  0.7.4
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Boazsegev

Facil.io

n/a

Version	Status	Constraints
0.7.0	affected	-
0.7.1	affected	-
0.7.2	affected	-
0.7.3	affected	-
0.7.4	affected	-

Remediation

No remediation recorded yet.

Metrics

0.52% 0.00522

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00522

Score over time

Jul–Oct 2026

EPSS v5

Percentile over time

EPSS v5

Table of values (2 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.52% (0.00522)	42.19th	v5 (v2026.06.15)
Jul 23, 2026	0.52% (0.00522)	41.16th	v5 (v2026.06.15)

Weaknesses (1)

CWE-20

Improper Input Validation

References (6)

https://github.com/boazsegev/facil.io/
product
https://github.com/boazsegev/facil.io/issues/169
exploitissue-tracking
https://vuldb.com/cve/CVE-2026-16632
third-party-advisory
https://vuldb.com/submit/860585
exploitthird-party-advisory
https://vuldb.com/vuln/382382
vdb-entrytechnical-description
https://vuldb.com/vuln/382382/cti
signaturepermissions-required

Link	Providers	Tags
https://github.com/boazsegev/facil.io/		product
https://github.com/boazsegev/facil.io/issues/169		exploitissue-tracking
https://vuldb.com/cve/CVE-2026-16632		third-party-advisory
https://vuldb.com/submit/860585		exploitthird-party-advisory
https://vuldb.com/vuln/382382		vdb-entrytechnical-description
https://vuldb.com/vuln/382382/cti		signaturepermissions-required