CVE-2025-13470
Publication date 21 November 2025
Last updated 10 July 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| rnp | 26.04 LTS resolute |
Needs evaluation
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
Severity score breakdown
CVSS version:
Base score
7.7 · High
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/AU:Y/RE:H/U:Red
Base score
7.5 · High
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2025-13470
- https://bugzilla.redhat.com/show_bug.cgi?id=2415863
- https://access.redhat.com/security/cve/cve-2025-13402
- https://aur.archlinux.org/packages/rnp
- https://github.com/rnpgp/rnp/commit/7bd9a8dc356aae756b40755be76d36205b6b161a
- https://github.com/rnpgp/rnp/releases/tag/v0.18.1
- https://open.ribose.com/advisories/ra-2025-11-20/
- https://packages.gentoo.org/packages/dev-util/librnp