Newline Injection Vulnerability in Boringproxy by Boringproxy Team
CVE-2026-70615

8.5HIGH

Key Information:

Vendor

Boringproxy

Status
Boringproxy
Vendor
CVE Published:
5 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-70615?

Boringproxy versions up to 0.10.0 are susceptible to a newline injection vulnerability that allows authenticated low-privileged users with tunnel-creation permissions to inject arbitrary lines into the SSH authorized_keys file of the server account. This can be exploited by supplying a percent-encoded newline character in the domain parameter of the tunnel creation endpoint. Consequently, attackers can insert unauthorized public key entries, gaining persistent shell access. This access may enable them to extract sensitive information such as cleartext credentials, user tokens, tunnel private keys, and TLS certificates from the database file.

Affected Version(s)

boringproxy 0 <= 0.10.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-70615 - Proof of Concept

References

https://github.com/theopaid/Remote-Code-Execution-And-Pri...
technical-descriptionexploit
https://www.vulncheck.com/advisories/boringproxy-ssh-auth...
third-party-advisory

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Theodosis Paidakis
.