SB20261110296 - Uncontrolled Recursion in brace-expansion

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Main Vulnerability Database SB20261110296

SB20261110296 - Uncontrolled Recursion in brace-expansion

Published: November 10, 2026

Security Bulletin ID SB20261110296
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: CVE-2026-102278)

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 a remote attacker to cause a denial of service by crashing applications using brace-expansion.

The vulnerability exists due to uncontrolled recursion in brace-expansion's expand_() function when expanding nested comma alternatives or single-part brace sets. A remote attacker can supply strings generated by '{a,'.repeat(4000) + 'z' + '}'.repeat(4000) or '{'.repeat(3200) + 'a,b' + '}'.repeat(3200) to expand(), directly or through user-supplied minimatch/glob patterns, to exhaust the stack and terminate the process if the resulting exception is uncaught.


Remediation

Install update from vendor's website.

References