# CVE-2025-13470: rnp: In RNP version 0.18.0 a refactoring regression causes the symmetric  session key used for Public-Key Encrypted Sessio...

CVE-2025-13470 is fixed in 6 products on 1 platform, first by FEDORA-2025-A96CCC98CA, released November 21, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-13470
- Priority: High
- CVSS: n/a (important)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 21, 2025

## Description

In RNP version 0.18.0 a refactoring regression causes the symmetric  session key used for Public-Key Encrypted Session Key (PKESK) packets to  be left uninitialized except for zeroing, resulting in it always being  an all-zero byte array.  Any data encrypted using public-key encryption  in this release can be decrypted trivially by supplying an all-zero  session key, fully compromising confidentiality.  The vulnerability affects only public key encryption (PKESK packets).  Passphrase-based encryption (SKESK packets) is not affected.  Root cause: Vulnerable session key buffer used in PKESK packet generation.    The defect was introduced in commit `7bd9a8dc356aae756b40755be76d36205b6b161a` where initialization  logic inside `encrypted_build_skesk()` only randomized the key for the  SKESK path and omitted it for the PKESK path.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | librnp Fedora 43 | 0.18.1-1.fc43 | [FEDORA-2025-A96CCC98CA](https://patchblox.com/security/data/fix/linux/fedora-2025-a96ccc98ca.md) | Nov 21, 2025 |
| Linux | librnp-debuginfo Fedora 43 | 0.18.1-1.fc43 | [FEDORA-2025-A96CCC98CA](https://patchblox.com/security/data/fix/linux/fedora-2025-a96ccc98ca.md) | Nov 21, 2025 |
| Linux | librnp-devel Fedora 43 | 0.18.1-1.fc43 | [FEDORA-2025-A96CCC98CA](https://patchblox.com/security/data/fix/linux/fedora-2025-a96ccc98ca.md) | Nov 21, 2025 |
| Linux | rnp Debian 14 | 0.18.1-1 | [DEBIAN-CVE-2025-13470](https://patchblox.com/security/data/fix/linux/debian-cve-2025-13470.md) | Nov 21, 2025 |
| Linux | rnp Fedora 43 | 0.18.1-1.fc43 | [FEDORA-2025-A96CCC98CA](https://patchblox.com/security/data/fix/linux/fedora-2025-a96ccc98ca.md) | Nov 21, 2025 |
| Linux | rnp opensuse-leap 16.0 | 0.18.1-bp160.1.1 | [OPENSUSE-SU-2025:20116-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20116-1.md) | Nov 27, 2025 |
| Linux | rnp-debuginfo Fedora 43 | 0.18.1-1.fc43 | [FEDORA-2025-A96CCC98CA](https://patchblox.com/security/data/fix/linux/fedora-2025-a96ccc98ca.md) | Nov 21, 2025 |
| Linux | rnp-debugsource Fedora 43 | 0.18.1-1.fc43 | [FEDORA-2025-A96CCC98CA](https://patchblox.com/security/data/fix/linux/fedora-2025-a96ccc98ca.md) | Nov 21, 2025 |

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Data as of 2026-11-08T19:12:23Z 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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