Medium severity · published Oct 9, 2026
CVE-2026-107834
OWASP Coraza WAF: Resource exhaustion via deferred file handle accumulation in multipart body processor
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
coraza · corazawaf
>= 3.0.0, < 3.8.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107834
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107834
x_refsource_CONFIRM
https://github.com/corazawaf/coraza/security/advisories/GHSA-rp9v-7xv3-r6g3
x_refsource_MISC
https://github.com/corazawaf/coraza/commit/1bc39036e99c88e7de60cf8e6bb55ee4c311223c
x_refsource_MISC
https://github.com/corazawaf/coraza/releases/tag/v3.8.0
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