OSEC-2026-03

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Import Source
https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-03.json
JSON Data
https://api.osv.dev/v1/vulns/OSEC-2026-03
Aliases
Published
2026-04-15T22:00:00Z
Modified
2026-11-06T13:45:04Z
Severity
  • 5.7 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
Summary
opam install sandbox escape
Details

Summary

.install files do not validate whether they are inside the package area, and so can bypass sandboxing.

Exploit

In a package.install file, this installs a file as ``~/.bashrc`:

bin: [
  "payload.sh" {"../../../.bashrc"}
]

Timeline

  • 2026-04-11: Anil forwarded the issue from Andrew Nesbitt to the OCaml security team
  • 2026-04-11: Kate developed a fix
  • 2026-04-15: opam 2.5.1 was released with the fix
Database specific 
{
    "cwe": [
        "CWE-693"
    ],
    "human_link": "https://github.com/ocaml/security-advisories/tree/main/advisories/2026/OSEC-2026-03.md",
    "osv": "https://github.com/ocaml/security-advisories/tree/generated-osv/2026/OSEC-2026-03.json"
}
References
Credits
    • Andrew Nesbitt - REPORTER
    • Kate - REMEDIATION_DEVELOPER
    • Raja Boujbel - REMEDIATION_REVIEWER
    • Hannes Mehnert - COORDINATOR

Affected packages

opam / opam-devel

Package

Name
opam-devel
Purl
pkg:opam/opam-devel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.5.1

Affected versions

2.*
2.0~alpha5
2.0.0~beta
2.0.0~beta3
2.0.0~beta3.1
2.0.0~beta5
2.0.0~rc
2.0.0~rc2
2.0.0~rc3
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.7
2.0.8
2.0.9
2.0.10
2.1.0~beta2
2.1.0~beta4
2.1.0~rc
2.1.0~rc2
2.1.0
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.2.0~alpha
2.2.0~alpha2
2.2.0~alpha3
2.2.0~beta1
2.2.0~beta2
2.2.0~beta3
2.2.0~rc1
2.2.0
2.2.1
2.3.0~alpha1
2.3.0~beta1
2.3.0~beta2
2.3.0~rc1
2.3.0
2.4.0~alpha1
2.4.0~alpha2
2.4.0~beta1
2.4.0~rc1
2.4.0
2.4.1
2.5.0~alpha1
2.5.0~beta1
2.5.0~rc1
2.5.0

Ecosystem specific 

{
    "opam_constraint": "opam-devel {< \"2.5.1\"}"
}

Database specific

source 
"https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-03.json"

Git / github.com/ocaml/opam

Affected ranges

Type
GIT
Repo
https://github.com/ocaml/opam
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d7283e3b5845447ee618794d87cfe224dd980c8f
Type
GIT
Repo
https://github.com/ocaml/opam
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c8fcf65779fe7048f9b5ef59886bfa9c5d102d84

Affected versions

0.*
0.2
0.3
0.3.1
0.4.0
0.5.0
0.6.0
0.7.2
0.7.3
0.7.4
0.7.5
0.7.6
0.7.7
0.8.0
0.8.1
0.9.0
0.9.1
0.9.2
0.9.3
0.9.4
0.9.5
0.9.6
1.*
1.0.0
1.1.0-RC
1.1.0-beta
1.2.0
1.2.0-beta
1.2.0-beta2
1.2.0-beta3
1.2.0-beta4
1.2.0-rc1
1.2.0-rc2
1.2.0-rc3
1.2.0-rc4
1.2.1
1.2.1-beta
1.2.1-beta2
1.2.1-beta3
1.2.1-rc
1.2.1-rc2
2.*
2.0-alpha
2.0-alpha4
2.0-alpha5
2.0.0
2.0.0-beta
2.0.0-beta2
2.0.0-beta3
2.0.0-beta3.1
2.0.0-beta4
2.0.0-beta5
2.0.0-beta6
2.0.0-rc
2.0.0-rc3
2.0.0-rc4
2.1.0-alpha
2.1.0-alpha2
2.1.0-alpha3
2.1.0-beta
2.1.0-beta4
2.1.0-rc
2.2.0-alpha
2.2.0-alpha2
2.2.0-alpha3
2.2.0-beta1
2.2.0-beta2
2.2.0-beta3
2.2.0-rc1
2.3.0-alpha1
2.4.0-alpha1
2.4.0-alpha2
2.4.0-beta1
2.4.0-rc1
2.5.0
2.5.0-alpha1
2.5.0-beta1
2.5.0-rc1

Database specific

source 
"https://github.com/ocaml/security-advisories/blob/generated-osv/2026/OSEC-2026-03.json"