SB20260720383 - Uncaught exception in Granian

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Main Vulnerability Database SB20260720383

SB20260720383 - Uncaught exception in Granian

Published: July 20, 2026

Security Bulletin ID SB20260720383
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) Uncaught Exception (CVE-ID: CVE-2026-42545)

CWE-ID: CWE-248 - Uncaught Exception

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:H/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 perform a denial of service (DoS) attack.

The vulnerability exists due to Granian aborts a worker process if a WSGI application returns an invalid HTTP response header name or value. The WSGI response conversion path uses .unwrap() on both the header name and header value constructors, so malformed output from the application becomes a process abort instead of a handled error. A remote attacker can trigger an uncaught exception and perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References