# CVE-2026-33155: deepdiff: DeepDiff is a project focused on Deep Difference and search of any Python data

CVE-2026-33155 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-33155, released March 20, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-33155
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 20, 2026

## Description

DeepDiff is a project focused on Deep Difference and search of any Python data. From version 5.0.0 to before version 8.6.2, the pickle unpickler _RestrictedUnpickler validates which classes can be loaded but does not limit their constructor arguments. A few of the types in SAFE_TO_IMPORT have constructors that allocate memory proportional to their input (builtins.bytes, builtins.list, builtins.range). A 40-byte pickle payload can force 10+ GB of memory, which crashes applications that load delta objects or call pickle_load with untrusted data. This issue has been patched in version 8.6.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | deepdiff Debian 13.5 (trixie) | 8.1.1-4+deb13u1 | [DEBIAN-CVE-2026-33155](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33155.md) | Mar 20, 2026 |
| Linux | deepdiff Debian 14 | 9.0.0-1 | [DEBIAN-CVE-2026-33155](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33155.md) | Mar 20, 2026 |
| Linux | python-deepdiff opensuse-leap 15.6 | 6.3.0-150600.3.6.1 | [SUSE-SU-2026:1094-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1094-1.md) | Mar 26, 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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