Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-4746

Severity CVSS v4.0:
CRITICAL
Type:
CWE-787 Out-of-bounds Write
Publication date:
24/03/2026
Last modified:
24/03/2026

Description

Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is associated with program files inflate.C.<br /> <br /> This issue affects proton: before 1.6.16.

Impact

Vector 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/S:N/AU:Y/R:U/V:C/RE:L/U:Amber CVSS v4.0 Severity and Metrics:

Base Score: 10.00 CRITICAL
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/S:N/AU:Y/R:U/V:C/RE:L/U:Amber

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): High
Integrity (VI): High
Availability (VA): High
Confidentiality (SC): High
Integrity (SI): High
Availability (SA): High
Safety (S): Negligible
Automatable (AU): Yes
Recovery (R): User
Value Density (V): Concentrated
Vulnerability Response Effort (RE): Low
Provider Urgency (U): Amber
Exploit Maturity (E): Attacked

Base Score 4.0
10.00
Severity 4.0
CRITICAL

References to Advisories, Solutions, and Tools