Coraza WAF silently drops arguments at ArgumentLimit, enabling rule bypass
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass, Denial of service
- Confidentiality · integrity · availability
- None · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-693 and CWE-770.
Summary
OWASP Coraza WAF, a ModSecurity-compatible web application firewall library for Go, silently drops arguments after SecArgumentsLimit in versions from 3.0.0 before 3.8.1. An unauthenticated attacker who sends more arguments than the limit, or a body that expands past the argument and flattening budgets, causes the excess values to be omitted from ARGS, ARGS_GET, ARGS_NAMES, ARGS_GET_NAMES, ARGS_POST or ARGS_PATH before rules inspect them. This can bypass WAF rules that protect the downstream application, and urlencoded and JSON processing can consume excessive memory, degrading service.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.0.0 until 3.8.1, Coraza silently drops arguments after SecArgumentsLimit in internal/corazawaf/transaction.go, while internal/bodyprocessors/urlencoded.go writes ARGS_POST without enforcing the cap. The flaw is triggered when an unauthenticated attacker sends more arguments than SecArgumentsLimit or supplies bodies that expand beyond the configured argument and flattening budgets. An unauthenticated attacker can flood requests with arguments so excess values are silently omitted from ARGS, ARGS_GET, ARGS_NAMES, ARGS_GET_NAMES, ARGS_POST, or ARGS_PATH before security rules inspect them; affected urlencoded and JSON processing can also consume excessive memory. The omission can bypass WAF rules protecting the downstream application, and unbounded or amplified argument processing can cause memory consumption and service degradation. This issue is fixed in version 3.8.1.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| corazawaf | coraza | 3.0.0 to before 3.8.1 | 3.8.1 | Patch available | CNA |
| — | github.com/corazawaf/coraza/v3 (Go) | 3.0.0 to before 3.8.1 | 3.8.1 | Patch available | GHSA-6r3q-mjv7-xr8m |
- coraza Vendorcorazawaf Affected 3.0.0 to before 3.8.1 Fixed in 3.8.1 Patch available CNA
- github.com/corazawaf/coraza/v3 (Go) Vendor— Affected 3.0.0 to before 3.8.1 Fixed in 3.8.1 Patch available GHSA-6r3q-mjv7-xr8m
Remediation
Upgrade the Go module github.com/corazawaf/coraza/v3 to version 3.8.1, which fixes the issue.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
- Fix · CNA coraza (corazawaf) Fixed in 3.8.1
- Fix · GHSA-6r3q-mjv7-xr8m github.com/corazawaf/coraza/v3 (Go) Fixed in 3.8.1 Advisory →
Timeline
- 2026-10-12 Threatist record created from CVE-2026-41510
- 2026-10-13 Priority changed: MEDIUM → LOW
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: LOW → HIGH
References
Other 6
- https://github.com/corazawaf/coraza/security/advisories/GHSA-6r3q-mjv7-xr8m
- https://github.com/corazawaf/coraza/commit/146c2f79f39ad16f13787e7d67ad400f8d8cb9a3
- https://github.com/corazawaf/coraza/commit/b98359bb7e7606c95100dcc7ad490d2d624e6dea
- https://github.com/corazawaf/coraza/releases/tag/v3.8.1
- https://github.com/corazawaf/coraza/commit/814e1898e083d2ff2ceb644382d0da17e930f93f
- https://github.com/corazawaf/coraza
More corazawaf vulnerabilities
- TI-2026-69592 Uncontrolled recursion in Coraza WAF JSON parsing crashes the process CVSS 3.1HIGH 7.5
- TI-2026-71268 Off-by-one error in OWASP Coraza jsDecode enables WAF rule bypass CVSS 3.1MEDIUM 5.8
- TI-2026-78712 Coraza JSON key collision lets SQL injection evade WAF rules CVSS 4.0MEDIUM 6.9
- TI-2026-78714 Multipart filename* charset handling bypasses Coraza FILES rules CVSS 4.0MEDIUM 6.3
- TI-2026-69596 Uncontrolled recursion in Coraza WAF JSON processing exhausts CPU CVSS 3.1MEDIUM 5.9
- TI-2026-71308 CRLF injection in OWASP Coraza WAF native audit log lets attackers forge lines CVSS 3.1MEDIUM 5.8
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences