What’s Vulnerable › Vulnerabilities

CVE-2026-107834: OWASP Coraza WAF: Resource exhaustion via deferred file handle accumulation in multipart body processor

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-09 · updated 2026-10-16
• Weakness: CWE-400

Description

OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.0.0 until 3.8.0, the multipart loop in internal/bodyprocessors/multipart.go executes defer temp.Close() for every uploaded file part, so each temporary-file descriptor remains open until the complete request returns. An unauthenticated attacker can submit a multipart body containing many minimal file parts and exhaust the process file-descriptor table within the request-body size limit, causing os.CreateTemp failures, MULTIPART_STRICT_ERROR responses, blocked legitimate uploads, and process-wide inability to open files or sockets. This issue is fixed in version 3.8.0.

Affected products

• corazawaf coraza: from 3.0.0, < 3.8.0

References

• https://github.com/corazawaf/coraza/commit/1bc39036e99c88e7de60cf8e6bb55ee4c311223c
• https://github.com/corazawaf/coraza/releases/tag/v3.8.0
• https://github.com/corazawaf/coraza/security/advisories/GHSA-rp9v-7xv3-r6g3

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