SB20261111161 - Inefficient Algorithmic Complexity in System.Formats.Cbor
Published: November 11, 2026
Security Bulletin ID
SB20261111161
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Inefficient Algorithmic Complexity (CVE-ID: CVE-2026-118747)
CWE-ID: CWE-407 - Inefficient Algorithmic Complexity
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.