PT-2026-49822 · Serverco · Getssl

Remy + 1 · Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-10303

Mitre

CVSS v3.1

7.4

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Fix

Weakness Enumeration

CWE-73

Related Identifiers

CVE-2026-10303

Affected Products

Getssl

References · 6

• https://cve.org/CVERecord?id=CVE-2023-38198 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-10303 · Security Note
• https://github.com/srvrco/getssl/releases/tag/v2.50 · Note
• https://github.com/srvrco/getssl/pull/896 · Note
• https://remyhax.xyz/posts/reproducing-lawful-tls-wiretapping · Note
• https://runzero.com/advisories/serverco-getssl-acme-cmd-injection-cve-2026-10303 · Note