Denial of Service in CivetWeb
CVE-2025-9648 is fixed in 2 products on 1 platform, first by civetweb 1.15+dfsg-3ubuntu0.1~esm1, released September 29, 2025. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| civetweb · Debian 13.5 (trixie) | 1.16+dfsg-2+deb13u1 | DEBIAN-CVE-2025-9648 | Sep 29, 2025 |
| civetweb · Debian 14 | 1.16+dfsg-4 | DEBIAN-CVE-2025-9648 | Sep 29, 2025 |
| civetweb · Ubuntu 22.04.1 LTS (jammy) | 1.15+dfsg-3ubuntu0.1~esm1 | civetweb 1.15+dfsg-3ubuntu0.1~esm1 | Sep 29, 2025 |
| civetweb · Ubuntu 24.04.5 LTS (noble) | 1.16+dfsg-1ubuntu0.1 | civetweb 1.16+dfsg-1ubuntu0.1 | Sep 29, 2025 |
| civetweb · Ubuntu 26.04.1 LTS (resolute) | 1.16+dfsg-3ubuntu0.1 | civetweb 1.16+dfsg-3ubuntu0.1 | Sep 29, 2025 |
| libcivetweb1 · Ubuntu 22.04.1 LTS (jammy) | 1.15+dfsg-3ubuntu0.1~esm1 | libcivetweb1 1.15+dfsg-3ubuntu0.1~esm1 | Sep 29, 2025 |
| libcivetweb1 · Ubuntu 24.04.5 LTS (noble) | 1.16+dfsg-1ubuntu0.1 | libcivetweb1 1.16+dfsg-1ubuntu0.1 | Sep 29, 2025 |
| libcivetweb1 · Ubuntu 26.04.1 LTS (resolute) | 1.16+dfsg-3ubuntu0.1 | libcivetweb1 1.16+dfsg-3ubuntu0.1 | Sep 29, 2025 |
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