Bug 2400107 (CVE-2025-9648)

Summary: CVE-2025-9648 civetweb: Denial of Service in CivetWeb
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A denial of service flaw has been discovered in CivetWeb. The mg_handle_form_request function allows attackers to trigger a denial of service (DoS) condition by sending a specially crafted HTTP POST request containing a null byte in the payload. The server enters an infinite loop during form data parsing as a result. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2400162, 2400163, 2400164, 2400165, 2400166    
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Description OSIDB Bzimport 2025-09-29 12:01:21 UTC
A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests.

This issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.