CVE-2026-73857
HIGH
MEDIUM
Priority: 0.03
BB Relevance:
75/100
Published: 2026-11-09
Modified: 2026-11-12
First seen: 2026-11-09
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
Description
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.15 until 3.0.17, XML request body processing with SecParseXmlIntoArgs set to On or OnlyArgs can leave XMLNodes::parsing_ctx_arg uninitialized in the SAX end-element callback. A single crafted unauthenticated HTTP request can make a worker dereference the pointer, resulting in a constant-value write to an attacker-controlled address. The resulting memory corruption can terminate the worker and may disclose memory or redirect execution. Earlier 3.0.x releases and ModSecurity 2.x do not use the affected path. This issue is fixed in version 3.0.17.
Weakness Classification (2)
Affected Software (2)
| Vendor | Product | Version |
|---|---|---|
| owasp-modsecurity | ModSecurity | >= 3.0.15, < 3.0.17 |
| owasp-modsecurity | ModSecurity | >= 3.0.15, < 3.0.17 |
References & Advisories (3)
x_refsource_MISC
x_refsource_MISC
x_refsource_CONFIRM