# CVE-2026-41082: opam: In OCaml opam before 2.5.1, a .install field containing a destination filepath can use ../ to reach a parent directory.

CVE-2026-41082 is fixed in 2 products on 1 platform, first by opam 2.5.0-1ubuntu0.1~esm1, released April 16, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-41082
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 16, 2026

## Description

In OCaml opam before 2.5.1, a .install field containing a destination filepath can use ../ to reach a parent directory.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | opam Debian 12.15 (bookworm) | 2.1.2-1+deb12u1 | [DEBIAN-CVE-2026-41082](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41082.md) | May 15, 2026 |
| Linux | opam Debian 13.5 (trixie) | 2.3.0-1+deb13u1 | [DEBIAN-CVE-2026-41082](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41082.md) | May 15, 2026 |
| Linux | opam Debian 14 | 2.5.1-1 | [DEBIAN-CVE-2026-41082](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41082.md) | May 15, 2026 |
| Linux | opam Ubuntu 20.04 LTS (focal) | 2.0.5-1ubuntu1+esm1 | [opam 2.0.5-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-opam-2.0.5-1ubuntu1-esm1.md) | May 15, 2026 |
| Linux | opam Ubuntu 22.04.1 LTS (jammy) | 2.1.2-1+deb12u1build0.22.04.1 | [opam 2.1.2-1+deb12u1build0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-opam-2.1.2-1-deb12u1build0.22.04.1.md) | May 15, 2026 |
| Linux | opam Ubuntu 24.04.5 LTS (noble) | 2.1.5-1ubuntu0.1~esm2 | [opam 2.1.5-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-opam-2.1.5-1ubuntu0.1-esm2.md) | May 15, 2026 |
| Linux | opam Ubuntu 25.10 (questing) | 2.3.0-1+deb13u1build0.25.10.1 | [opam 2.3.0-1+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-opam-2.3.0-1-deb13u1build0.25.10.1.md) | May 15, 2026 |
| Linux | opam Ubuntu 26.04.1 LTS (resolute) | 2.5.0-1ubuntu0.1~esm1 | [opam 2.5.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-opam-2.5.0-1ubuntu0.1-esm1.md) | Apr 16, 2026 |
| Linux | opam opensuse-leap 16.0 | 2.5.2-bp160.1.1 | [OPENSUSE-SU-2026:21380-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21380-1.md) | Jul 18, 2026 |
| Linux | opam-installer Ubuntu 20.04 LTS (focal) | 2.0.5-1ubuntu1+esm1 | [opam-installer 2.0.5-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-opam-installer-2.0.5-1ubuntu1-esm1.md) | May 15, 2026 |
| Linux | opam-installer Ubuntu 22.04.1 LTS (jammy) | 2.1.2-1+deb12u1build0.22.04.1 | [opam-installer 2.1.2-1+deb12u1build0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-opam-installer-2.1.2-1-deb12u1build0.22.04.1.md) | May 15, 2026 |
| Linux | opam-installer Ubuntu 24.04.5 LTS (noble) | 2.1.5-1ubuntu0.1~esm2 | [opam-installer 2.1.5-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-opam-installer-2.1.5-1ubuntu0.1-esm2.md) | May 15, 2026 |
| Linux | opam-installer Ubuntu 25.10 (questing) | 2.3.0-1+deb13u1build0.25.10.1 | [opam-installer 2.3.0-1+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-opam-installer-2.3.0-1-deb13u1build0.25.10.1.md) | May 15, 2026 |
| Linux | opam-installer Ubuntu 26.04.1 LTS (resolute) | 2.5.0-1ubuntu0.1~esm1 | [opam-installer 2.5.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-opam-installer-2.5.0-1ubuntu0.1-esm1.md) | Apr 16, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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