CVE-2026-107834 OWASP Coraza WAF: Resource exhaustion via deferred file handle accumulation in multipart body processor
An unauthenticated attacker can exhaust file descriptors by submitting multipart requests with many parts, causing denial of service in Coraza WAF.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107834?
CVE-2026-107834 is a medium-severity denial of service vulnerability in corazawaf coraza, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-107834?
5 open source packages ship an affected version, including github.com/corazawaf/coraza/v3, github.com/corazawaf/coraza and github.com/corazawaf/coraza/v2.
| Package | Affected | Fixed in |
|---|---|---|
github.com/corazawaf/coraza/v3 Go | From 3.0.0 | 3.8.0 |
github.com/corazawaf/coraza/v3 Go | From 3.0.0 | 3.8.0 |
github.com/corazawaf/coraza/v3 Go | From 3.0.0 | 3.8.0 |
github.com/corazawaf/coraza Go | All versions | None |
github.com/corazawaf/coraza/v2 Go | All versions | None |
How do I fix CVE-2026-107834?
Upgrade github.com/corazawaf/coraza/v3 to 3.8.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-107834 being exploited?
There is no known exploitation of CVE-2026-107834 in the wild and no public exploit code.
Sources
Also known as GHSA-rp9v-7xv3-r6g3, GO-2026-6697.