ServerCo getssl ACME shell script path injection

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Summary

CVECVE-2026-10303
StatePUBLISHED
AssignerrunZero
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-16 20:16:26 UTC
Updated2026-06-17 17:16:41 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from 44488dab-36db-4358-99f9-bc116477f914

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.007570000 probability, percentile 0.503180000 (date 2026-06-18)

Problem Types: CWE-73 | CWE-73 CWE-73 External control of file name or path

VersionSourceTypeScoreSeverityVector
3.144488dab-36db-4358-99f9-bc116477f914Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNACVSS7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ServerCo Getssl affected 2.49 custom Not specified

References

ReferenceSourceLinkTags
www.cve.org/CVERecord 44488dab-36db-4358-99f9-bc116477f914 www.cve.org
remyhax.xyz/posts/reproducing-lawful-tls-wiretapping 44488dab-36db-4358-99f9-bc116477f914 remyhax.xyz
www.runzero.com/advisories/serverco-getssl-acme-cmd-injection-cve-2026-10303 44488dab-36db-4358-99f9-bc116477f914 www.runzero.com
github.com/srvrco/getssl/releases/tag/v2.50 44488dab-36db-4358-99f9-bc116477f914 github.com
github.com/srvrco/getssl/pull/896 44488dab-36db-4358-99f9-bc116477f914 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: remy (en)

CNA: Tod Beardsley of runZero (en)

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