# CVE-2026-40339: libgphoto2-6: libgphoto2 is a camera access and control library

CVE-2026-40339 is fixed in 6 products on 1 platform, first by libgphoto2-6 2.5.27-1ubuntu0.1, released April 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-40339
- Priority: Routine
- CVSS: 5.2 (Medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 17, 2026

## Description

libgphoto2 is a camera access and control library. Versions up to and including 2.5.33 have an out-of-bounds read in `ptp_unpack_Sony_DPD()` in `camlibs/ptp2/ptp-pack.c` (line 842). The function reads the FormFlag byte via `dtoh8o(data, *poffset)` without a prior bounds check. The standard `ptp_unpack_DPD()` at lines 686–687 correctly validates `*offset + sizeof(uint8_t) > dpdlen` before this same read, but the Sony variant omits this check entirely. Commit 09f8a940b1e418b5693f5c11e3016a1ad2cea62d fixes the issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libgphoto2 Debian 14 | 2.5.34-1 | [DEBIAN-CVE-2026-40339](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40339.md) | Apr 18, 2026 |
| Linux | libgphoto2-6 Ubuntu 22.04.1 LTS (jammy) | 2.5.27-1ubuntu0.1 | [libgphoto2-6 2.5.27-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libgphoto2-6-2.5.27-1ubuntu0.1.md) | Apr 17, 2026 |
| Linux | libgphoto2-6t64 Ubuntu 24.04.5 LTS (noble) | 2.5.31-2.1ubuntu1.1 | [libgphoto2-6t64 2.5.31-2.1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libgphoto2-6t64-2.5.31-2.1ubuntu1.1.md) | Apr 17, 2026 |
| Linux | libgphoto2-6t64 Ubuntu 26.04.1 LTS (resolute) | 2.5.33-1ubuntu1.1 | [libgphoto2-6t64 2.5.33-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libgphoto2-6t64-2.5.33-1ubuntu1.1.md) | Apr 17, 2026 |
| Linux | libgphoto2-l10n Ubuntu 22.04.1 LTS (jammy) | 2.5.27-1ubuntu0.1 | [libgphoto2-l10n 2.5.27-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libgphoto2-l10n-2.5.27-1ubuntu0.1.md) | Apr 17, 2026 |
| Linux | libgphoto2-l10n Ubuntu 24.04.5 LTS (noble) | 2.5.31-2.1ubuntu1.1 | [libgphoto2-l10n 2.5.31-2.1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libgphoto2-l10n-2.5.31-2.1ubuntu1.1.md) | Apr 17, 2026 |
| Linux | libgphoto2-l10n Ubuntu 26.04.1 LTS (resolute) | 2.5.33-1ubuntu1.1 | [libgphoto2-l10n 2.5.33-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libgphoto2-l10n-2.5.33-1ubuntu1.1.md) | Apr 17, 2026 |
| Linux | libgphoto2-port12 Ubuntu 22.04.1 LTS (jammy) | 2.5.27-1ubuntu0.1 | [libgphoto2-port12 2.5.27-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libgphoto2-port12-2.5.27-1ubuntu0.1.md) | Apr 17, 2026 |
| Linux | libgphoto2-port12t64 Ubuntu 24.04.5 LTS (noble) | 2.5.31-2.1ubuntu1.1 | [libgphoto2-port12t64 2.5.31-2.1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libgphoto2-port12t64-2.5.31-2.1ubuntu1.1.md) | Apr 17, 2026 |
| Linux | libgphoto2-port12t64 Ubuntu 26.04.1 LTS (resolute) | 2.5.33-1ubuntu1.1 | [libgphoto2-port12t64 2.5.33-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libgphoto2-port12t64-2.5.33-1ubuntu1.1.md) | Apr 17, 2026 |

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Data as of 2026-11-08T06:59:42Z 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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