CVE catalog
CVE-2026-30923
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the ModSecurity v3 project. A segmentation fault occur
- Severity
- High · CVSS 8.2
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.43% · Oct 25, 2026
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the ModSecurity v3 project. A segmentation fault occurs when a rule using the t:hexDecode transformation inspects a query string parameter containing a single character. An attacker can exploit this to crash worker processes, causing a denial of service. Service resumes once the attack stops as worker processes recover from the segfault. All versions before 3.0.15 of libModSecurity3 are affected. This has been patched in version 3.0.15.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | modsecurity | sid | 3.0.16-1 | fixed |
| Debian | modsecurity | forky | 3.0.16-1 | fixed |
| Debian | modsecurity | trixie | 3.0.14-1+deb13u1 | fixed |
| Debian | modsecurity | bookworm | 3.0.9-1+deb12u2 | fixed |
| Cpe | modsecurity | Not reported | 3.0.15 | fixed |
| Opensuse | modsecurity | tumbleweed | 3.0.15-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | modsecurity | source | sid | 3.0.15-1 | not yet assigned | Not reported | Not reported |
| Debian | modsecurity | source | forky | 3.0.15-1 | not yet assigned | Not reported | Not reported |
| Debian | modsecurity | source | trixie | 3.0.14-1+deb13u1 | not yet assigned | Not reported | Not reported |
| Debian | modsecurity | source | bookworm | 3.0.9-1+deb12u2 | not yet assigned | Not reported | Not reported |
| Cpe | modsecurity | cpe | Not reported | 3.0.15 | Not reported | Not reported | Not reported |
| Opensuse | modsecurity | rpm | tumbleweed | 3.0.15-1.1 | Not reported | OPENSUSE-SU-2026:10732-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [libmodsecurity3]Unknown
Source package: [modsecurity]
Details (1)
3.0.15-2.3· x86_64 · tumbleweedUnknown · Fixed:
3.0.15-1.1Version impact unknown
nvd · modsecurity · opensuse · tumbleweed
- [modsecurity-devel]Unknown
Source package: [modsecurity]
Details (1)
3.0.15-2.3· x86_64 · tumbleweedUnknown · Fixed:
3.0.15-1.1Version impact unknown
nvd · modsecurity · opensuse · tumbleweed
- [modsecurity]Fixed
Source package: [modsecurity]
Details (1)
3.0.15-2.3· x86_64 · tumbleweedFixed · Fixed:
3.0.15-1.1nvd · modsecurity · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [libmodsecurity3]Fixed
Source package: [modsecurity]
Details (2)
3.0.9-1+deb12u2· amd64 · bookwormFixed · Fixed:
3.0.9-1+deb12u2nvd · modsecurity · debian · bookworm; nvd · modsecurity · debian · 12
3.0.9-1+deb12u2· arm64 · bookwormFixed · Fixed:
3.0.9-1+deb12u2nvd · modsecurity · debian · bookworm; nvd · modsecurity · debian · 12
- [libmodsecurity-dev]Fixed
Source package: [modsecurity]
Details (2)
3.0.9-1+deb12u2· amd64 · bookwormFixed · Fixed:
3.0.9-1+deb12u2nvd · modsecurity · debian · bookworm; nvd · modsecurity · debian · 12
3.0.9-1+deb12u2· arm64 · bookwormFixed · Fixed:
3.0.9-1+deb12u2nvd · modsecurity · debian · bookworm; nvd · modsecurity · debian · 12
[Debian 13 (Trixie)]
- [libmodsecurity3t64]Fixed
Source package: [modsecurity]
Details (2)
3.0.14-1+deb13u1· amd64 · trixieFixed · Fixed:
3.0.14-1+deb13u1nvd · modsecurity · debian · 13
3.0.14-1+deb13u1· arm64 · trixieFixed · Fixed:
3.0.14-1+deb13u1nvd · modsecurity · debian · 13
- [libmodsecurity-dev]Fixed
Source package: [modsecurity]
Details (2)
3.0.14-1+deb13u1· amd64 · trixieFixed · Fixed:
3.0.14-1+deb13u1nvd · modsecurity · debian · 13
3.0.14-1+deb13u1· arm64 · trixieFixed · Fixed:
3.0.14-1+deb13u1nvd · modsecurity · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10732-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-30923]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-30923]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10732-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-30923]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-30923.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1308.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]