boringproxy up to 0.10.0 Tunnel Creation domain injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in boringproxy up to 0.10.0. Affected by this issue is some unknown functionality of the component Tunnel Creation. The manipulation of the argument domain leads to injection. This vulnerability is uniquely identified as CVE-2026-70615. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in boringproxy up to 0.10.0. It has been rated as critical. This issue affects an unknown functionality of the component Tunnel Creation. The manipulation of the argument domain with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-70615 since 08/04/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/05/2026). The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Firewall Software

Name

• boringproxy

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Entryinfo

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