CVE-2026-61619
HIGH
MEDIUM
Priority: 0.05
BB Relevance:
78/100
Published: 2026-11-11
Modified: 2026-11-12
First seen: 2026-11-11
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
X
AT:
None
VC:
None
VI:
Low
VA:
High
Description
The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.10, 4.25.1, and 4.28.0, regular-expression denial of service (ReDoS) affects a shared regex-assembly include used to build 12 Unix RCE detection rules in CRS v4, and the same ambiguous pattern was present in the manually-assembled regexes in 4 rules in CRS v3.3. With a single, unauthenticated, crafted request, the generated pattern drives PCRE2 past its backtracking limit. When PCRE2 exceeds that limit, the @rx operator returns an error rather than a match result, which results in detection bypass and CPU denial of service. This issue has been patched in versions 3.3.10, 4.25.1, and 4.28.0.
Weakness Classification (1)
Affected Software (6)
| Vendor | Product | Version |
|---|---|---|
| coreruleset | coreruleset | < 3.3.10 |
| coreruleset | coreruleset | < 4.25.1 |
| coreruleset | coreruleset | < 4.28.0 |
| coreruleset | coreruleset | < 3.3.10 |
| coreruleset | coreruleset | < 4.25.1 |
| coreruleset | coreruleset | < 4.28.0 |
References & Advisories (4)
x_refsource_MISC
x_refsource_MISC
x_refsource_MISC
x_refsource_CONFIRM