PT-2026-27326 · Timeplus Io · Proton

Titan Team · Published 2026-03-24 · Updated 2026-03-24 · CVE-2026-4746

Positive Technologies (AI Summary)

CVSS v4.0

10

Critical

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:U/V:C/RE:L/U:Amber

Name of the Vulnerable Software and Affected Versions timeplus-io proton versions prior to 1.6.16

Description An out-of-bounds write issue exists in the inflate.C file within the base/poco/Foundation/src modules of proton. This flaw is a heap smash, potentially leading to remote code execution. The issue is network-reachable and does not require authentication, potentially allowing for full system compromise.

Recommendations Update to a version of timeplus-io proton version 1.6.16 or later.

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2026-4746

Affected Products

Proton

References · 4

• https://github.com/timeplus-io/proton/pull/943 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-4746 · Security Note
• https://twitter.com/0dayPublishing/status/2036298022229889041 · Twitter Post
• https://twitter.com/ctiwatchcloud/status/2036412716450037971 · Twitter Post