CVE-2026-41508CWE-693CWE-755

CVE-2026-41508

Medium · published October 13, 2026

CVSS v3.1
5.8
EPSS
0%
Percentile
41.5
In the wild
Unconfirmed
What it is

OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.4.0 until 3.8.0, the multipart processor in internal/bodyprocessors/multipart.go treats io.ErrUnexpectedEOF as nonfatal without setting MULTIPART_STRICT_ERROR. A remote attacker can submit a truncated multipart body that produces io.ErrUnexpectedEOF, causing parsing to stop without raising the strict-error signal used by the recommended defensive rule. Rules 200002 and 200003 do not fire, allowing multipart parser-disagreement payloads to reach a backend that interprets the truncated body differently. This issue is fixed in version 3.8.0.

The record
Technical detail
CVSS v3.1
5.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00494 · 41.5th percentile
Weaknesses
CWE-693 · Protection Mechanism Failure; CWE-755 · Improper Handling of Exceptional Conditions
Published
2026-10-13T01:17Z
References (3)
https://github.com/corazawaf/coraza/commit/f94c81bec209f658120c418448d0590a549b71df · [email protected]https://github.com/corazawaf/coraza/releases/tag/v3.8.0 · [email protected]https://github.com/corazawaf/coraza/security/advisories/GHSA-r3rm-qphw-hh76 · [email protected]
EPSS history
Timeline
  • 14 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 12 OCT 20:01Z
    OWASP Coraza WAF: Truncated multipart body bypasses MULTIPART_STRICT_ERROR (rule 200003) via silent io.ErrUnexpectedEOF handling
    cvelistv5
  • 12 OCT 20:01Z
    OWASP Coraza WAF: Truncated multipart body bypasses MULTIPART_STRICT_ERROR (rule 200003) via silent io.ErrUnexpectedEOF handling
    cvelistv5