SB2026052546 - Ubuntu update for ngtcp2
Published: May 25, 2026
Security Bulletin ID
SB2026052546
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Buffer overflow (CVE-ID: CVE-2026-40170)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to memory corruption in thirdparty ngtcp2 when processing network traffic. A remote attacker can send specially crafted network traffic to execute arbitrary code.
Remediation
Install update from vendor's website.