Vulnerability · Published Mar 24, 2026 · Assigned by GovTech CSG
CVE-2026-4746Heap Buffer Over-Write Vulenrabilty in timeplus-io/proton
Critical 10.0
In plain English
A critical-severity out-of-bounds write in proton from timeplus-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).
Severity (CVSS 4.0)10.0Critical
Exploit odds (30 days)0.3%top 81.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src modules). This vulnerability is associated with program files inflate.C. This issue affects proton: before 1.6.16.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| timeplus-io | proton | 0 – before 1.6.16 |
Weakness: CWE-787 · 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