SB20261001153 - Ubuntu update for civetweb

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Main Vulnerability Database SB20261001153

SB20261001153 - Ubuntu update for civetweb

Published: October 1, 2026

Security Bulletin ID SB20261001153
CSH Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Medium 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Stack-based buffer overflow (CVE-ID: CVE-2025-55763)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 9.3 [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]


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when handling HTTP requests. A remote unauthenticated attacker can send a specially crafted HTTP request, trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


2) Resource exhaustion (CVE-ID: CVE-2025-9648)

CWE-ID: CWE-400 - Resource exhaustion

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 perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when handling HTTP POST requests with a null byte in the payload within the mg_handle_form_request() function. A remote attacker can send a specially crafted HTTP request to the application and consume all available CPU resources, leading to a denial of service. 


Remediation

Install update from vendor's website.

References