by Kastro
Paper/Archive/CVE-2026-70615

CVE-2026-70615

boringproxy boringproxy — boringproxy 0.10.0 SSH authorized_keys Injection via Tunnel Creation

EPSS 0.4%public exploitCVSS 9.9
critical.is priorityof 100
46
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 28.8.288 × 205.8Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
boringproxy≤ 0.10.0–CNA

Scores by source

VulnCheck (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
VulnCheck (CNA)8.5CVSS: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 ADPSSVCExploitation: poc · Automatable: no · Technical impact: partial

References

exploitgithub.com/theopaid/Remote-Code-Execution-And-Privilege-Escalation-Through-SSH-Authorized-Keys-Injection-boringproxy-/blob/master/README.mdwriteupvulncheck.com/advisories/boringproxy-ssh-authorized-keys-injection-via-tunnel-creation