Vulnerability in Boringproxy
CVE-2026-70615
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.
Vulnerability class: CRLF Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Boringproxy — versions 0
Weakness classification (CWE)
References
- github.com/theopaid/Remote-Code-Execution-And-Privilege-Escalation-Through-SSH-… (technical-description, exploit)
- www.vulncheck.com/advisories/boringproxy-ssh-authorized-keys-injection-via-tunn… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-70615?
- CVE-2026-70615 is a critical-severity vulnerability in Boringproxy, classified under CRLF Injection. CVSS score: 9.9/10. Published 2026-08-05.
- How severe is CVE-2026-70615?
- Critical severity. CVSS v3 base score is 9.9 out of 10.