CVE-2026-70615Public exploitNetwork attack vector

Server-account shell access via authorized_keys newline injection

Published Aug 5, 2026 · Updated Aug 5, 2026

CRLF injection in boringproxy through 0.10.0 allows remote authenticated users to gain a server-account shell via tunnel creation. The tunnel-creation path checks the domain parameter only for emptiness, then formats it into a line appended to the server account's authorized_keys file without rejecting embedded newlines. A low-privileged token that permits tunnel creation is sufficient to add an unrestricted key, retain shell access across service restarts, and read stored tokens, tunnel keys, and TLS certificates.

CVSS severity8.5
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CRLF injection in boringproxy through 0.10.0 allows remote authenticated users to gain a server-account shell via tunnel creation. The tunnel-creation path checks the domain parameter only for emptiness, then formats it into a line appended to the server account's authorized_keys file without rejecting embedded newlines. A low-privileged token that permits tunnel creation is sufficient to add an unrestricted key, retain shell access across service restarts, and read stored tokens, tunnel keys, and TLS certificates.

The record

CVE
CVE-2026-70615
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
boringproxy
Product
boringproxy
Classifications
CWE-93, T1098.004, T1552.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

boringproxy · boringproxyversion=0 <=0.10.0

Published CVSS scores

8.5VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H
9.9VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
T1098.004SSH Authorized Keys
T1552.001Credentials In Files

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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