SB2026111218 - Uncontrolled Recursion in CBOR2
Published: November 12, 2026
Security Bulletin ID
SB2026111218
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Uncontrolled Recursion (CVE-ID: N/A)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service by terminating the Python process.
The vulnerability exists due to uncontrolled recursion in cbor2.dumps() when encoding deeply nested Python containers. A remote attacker can supply deeply nested data to an application that serializes attacker-influenced objects to exhaust the native stack and trigger a process-terminating SIGSEGV instead of a catchable Python exception.
Remediation
Install update from vendor's website.