Inefficient Algorithmic Complexity in System.Formats.Cbor - CVE-2026-118747
Published: November 11, 2026
Vulnerability identifier: #VU165845
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-118747
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient algorithmic complexity in System.Formats.Cbor when processing untrusted input received over a network. A remote attacker can supply specially crafted input to trigger excessive computational work and cause a denial of service.
Affected software
System.Formats.Cbor
How to mitigate CVE-2026-118747
Install security update from vendor's website.
System.Formats.Cbor - addressed in versions 8.0.2, 9.0.24, 10.0.15, 11.0.0