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OSEC-2026-24

HighCVSS 7.3 / 10
Published Oct 23, 2026·Last modified Oct 23, 2026
Affected Components(22)
ocaml/ocaml
4.14.1-rc1
ocaml/ocaml
5.5.0-beta1
ocaml/ocaml
5.5.1
1 / 8
Description

ANT-2026-R7FKP7RG Win32 quote_cmd_filename misses pipe/redirect metacharacters

ANT-2026-SRZZ62SD Windows batch-file argument injection via maybe_quote/make_cmdline

ANT-2026-JPEWMPAB Win32 argument quoting leaves embedded CR/LF unescaped

Also includes the fix for OSEC-2026-05

Filename.quote_command returns a quoted command line, suitable for use as an argument to Sys.command, Unix.system, and the Unix.open_process functions. However on Windows certain characters weren't properly escaped.

Unix.create_process can invoke .bat or .cmd programs on Windows, and certain characters were accepted that cannot be quoted safely.

Fix

Filename.quote_command has been updated to correctly quote arguments. Unix.create_process* has been updated to reject arguments that cannot be safely quoted by raising Failure:

if the program [prog] is a [.bat] or [.cmd] script and either [prog] or [args] contain characters that cannot be securely passed to a script, such as [" | & , ; < = > ^ % "]. If you really need to pass these characters to a script, consider using {!Unix.system} instead.

Am I affected?

If you use Filename.quote_command on Windows with user supplied arguments. If you use Unix.create_process* or Unix.open_process* on Windows with .bat or .cmd programs, and user supplied arguments.

Timeline

  • 2026-08-24: vulnerability was found
  • 2026-08-27: forwarded report to security@ocaml.org
  • 2029-09-05: fix merged to trunk
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Risk Scores
Base Score
7.3

The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
6.1

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-41083
    Alias

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High severity
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