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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-10303 Detail

Description

In ServerCo getssl version 2.49 and prior, the ACME challenge token returned to the client was not strictly validated against RFC 8555 before being used in challenge-file handling, allowing a maliciously crafted token to influence local path/filename usage during validation. An attacker who can supply ACME challenge responses to getssl (for example, a malicious or compromised CA endpoint, or an on-path adversary able to tamper with that response path) could exploit this to achieve unauthorized file write/path traversal effects, usually with elevated privileges, ultimately allowing for remote command injection. This issue appears related in spirit to CVE-2023-38198, and is an instance of CWE-73, "External control of file name or path." Other ACME shell script handlers may be affected by similar issues.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/srvrco/getssl/pull/896 runZero
https://github.com/srvrco/getssl/releases/tag/v2.50 runZero
https://remyhax.xyz/posts/reproducing-lawful-tls-wiretapping/ runZero
https://www.cve.org/CVERecord?id=CVE-2023-38198 runZero
https://www.runzero.com/advisories/serverco-getssl-acme-cmd-injection-cve-2026-10303/ runZero

Weakness Enumeration

CWE-ID CWE Name Source
CWE-73 External Control of File Name or Path runZero  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-10303
NVD Published Date:
06/16/2026
NVD Last Modified:
06/16/2026
Source:
runZero