CVE-2025-13470
Severity CVSS v4.0:
HIGH
Type:
CWE-330
Use of Insufficiently Random Value
Publication date:
21/11/2025
Last modified:
21/11/2025
Description
In RNP version 0.18.0 a refactoring regression causes the symmetric <br />
session key used for Public-Key Encrypted Session Key (PKESK) packets to<br />
be left uninitialized except for zeroing, resulting in it always being <br />
an all-zero byte array.<br />
<br />
Any data encrypted using public-key encryption <br />
in this release can be decrypted trivially by supplying an all-zero <br />
session key, fully compromising confidentiality.<br />
<br />
The vulnerability affects only public key encryption (PKESK packets). Passphrase-based encryption (SKESK packets) is not affected.<br />
<br />
Root cause: Vulnerable session key buffer used in PKESK packet generation.<br />
<br />
<br />
<br />
The defect was introduced in commit `7bd9a8dc356aae756b40755be76d36205b6b161a` where initialization <br />
logic inside `encrypted_build_skesk()` only randomized the key for the <br />
SKESK path and omitted it for the PKESK path.
Impact
Base Score 4.0
7.70
Severity 4.0
HIGH
Base Score 3.x
7.50
Severity 3.x
HIGH
References to Advisories, Solutions, and Tools
- https://access.redhat.com/security/cve/cve-2025-13402
- https://aur.archlinux.org/packages/rnp
- https://bugzilla.redhat.com/show_bug.cgi?id=2415863
- https://github.com/rnpgp/rnp/commit/7bd9a8dc356aae756b40755be76d36205b6b161a
- https://github.com/rnpgp/rnp/releases/tag/v0.18.1
- https://launchpad.net/ubuntu/+source/rnp
- https://open.ribose.com/advisories/ra-2025-11-20/
- https://packages.gentoo.org/packages/dev-util/librnp