CVE-2025-13470: ribose rnp Use of Insufficiently Random Values

Vulnerability summary

CVE-2025-13470 is a high (CVSS 7.7) Use of Insufficiently Random Values vulnerability in ribose rnp. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21.6% of scored vulnerabilities.

Timeline

1. 21-11-2025
   PublishedVulnerability first disclosed.
2. 21-11-2025
   Last modifiedVulnerability information updated.

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.

• CWE-330Use of Insufficiently Random ValuesThe product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.