CVE-2025-13470
The vulnerability affects only public key encryption (PKESK packets).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.30%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.7 HIGHCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.30% probability · 23th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-330
- Source
- 6504adb2-f5e9-4c9b-9eda-5e19c93bd9b3
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.