SB2026110979 - Uncontrolled Recursion in CBOR2

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Main Vulnerability Database SB2026110979

SB2026110979 - Uncontrolled Recursion in CBOR2

Published: November 9, 2026

Security Bulletin ID SB2026110979
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • 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: 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 an unauthenticated remote attacker to crash a service decoding untrusted CBOR data.

The vulnerability exists due to missing recursion guards in CBOR2's Rust CBORTag hashing when value-sharing references create a cyclic tag used as a map key or set element. An unauthenticated remote attacker can submit a crafted CBOR payload that exhausts the stack during decoding under default settings, terminating the worker process with a segmentation fault.


Remediation

Install update from vendor's website.

References