CVE-2026-30923

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Source
https://cve.org/CVERecord?id=CVE-2026-30923
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-30923.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-30923
Aliases
Downstream
Related
Published
2026-05-05T18:46:03.201Z
Modified
2026-05-28T03:53:52.768352612Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
libModSecurity3 denial of service via segfault when using t:hexDecode on single-character query strings
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30923.json",
    "cwe_ids": [
        "CWE-125"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/owasp-modsecurity/modsecurity

Affected ranges

Type
GIT
Repo
https://github.com/owasp-modsecurity/modsecurity
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0fb4aff98b4980cf6426697d5605c424e3d5bb60

Affected versions

v2.*
v2.7.4
v2.9.0
v2.9.0-rc1
v2.9.0-rc2
v3.*
v3.0.0
v3.0.0-rc1
v3.0.1
v3.0.10
v3.0.11
v3.0.12
v3.0.13
v3.0.14
v3.0.2
v3.0.3
v3.0.4
v3.0.5
v3.0.6
v3.0.7
v3.0.8
v3.0.9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-30923.json"