Description
Buffer Overflow in the URI parser of CivetWeb 1.14 through 1.16 (latest) allows a remote attacker to achieve remote code execution via a crafted HTTP request. This vulnerability is triggered during request processing and may allow an attacker to corrupt heap memory, potentially leading to denial of service or arbitrary code execution.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | civetweb | 1.16+dfsg-3 | — |
| Debian 13 | civetweb | 1.16+dfsg-2+deb13u1 | — |
| Debian 12 | civetweb | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | civetweb | 1.16+dfsg-3 | — |
| Ubuntu 26.04 LTS | civetweb | 1.16+dfsg-3 | USN-8749-1 |
| Ubuntu 25.10 | civetweb | No fix yet | — |
| Ubuntu 24.04 LTS | civetweb | 1.16+dfsg-1ubuntu0.1 | USN-8749-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | civetweb | 1.15+dfsg-3ubuntu0.1~esm1 | USN-8749-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | civetweb | 1.6+git1776611085.588860e3-1.1 | openSUSE-SU-2026:10818-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
krispybyte/CVE-2025-55763 ★ 5 · Aug 29, 2025
Heap overflow PoC for CivetWeb CVE-2025-55763
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- USN-8749-1 civetweb vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- openSUSE-SU-2026:10818-1 civetweb-1.6+git1776611085.588860e3-1.1 on GA media SUSE / openSUSE Security Updates · May 21, 2026