# 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.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Oct 2026
- **Updated:** 13 Oct 2026
- **Also known as:** GHSA-rp9v-7xv3-r6g3, GO-2026-6697

## 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.

Weakness: CWE-772 (Missing Release of Resource after Effective Lifetime), CWE-400 (Uncontrolled Resource Consumption)

## 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 | Ecosystem | 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.

## Is CVE-2026-107834 being exploited?

There is no known exploitation of CVE-2026-107834 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-107834 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-107834 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/corazawaf/coraza/v3 (Go): affected from 3.0.0; fixed in 3.8.0
- github.com/corazawaf/coraza/v3 (Go): affected from 3.0.0; fixed in 3.8.0
- github.com/corazawaf/coraza/v3 (Go): affected from 3.0.0; fixed in 3.8.0
- github.com/corazawaf/coraza (Go): affected all versions; no fix listed
- github.com/corazawaf/coraza/v2 (Go): affected all versions; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-107834/ (Markdown: https://insights.sbomify.com/CVE-2026-107834/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-107834
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107834
- OSV: https://osv.dev/vulnerability/CVE-2026-107834

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-107834/
Summaries are generated and may contain mistakes; the official description above is the record.