CVE-2026-16615

Public on 2026-07-22
Modified on 2026-07-27
Description
A flaw was found in librest. The PKCE implementation for OAuth authorization uses the GRand function from the GLib API, a cryptographically insecure pseudo-random number generator. Because the generated "code verifier" lacks sufficient cryptographic entropy, a malicious actor can reverse-engineer the pseudo-random number generator (PRNG) seed to predict or reconstruct the code verifier string, allowing an attacker to bypass PKCE protections and successfully impersonate the client during the OAuth 2.0 authorization flow.
Severity
Medium severity
Medium
See what this means
CVSS v3 Base Score
6.8
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2 - Core rest Not Affected
Amazon Linux 2023 rest Pending Fix
Amazon Linux 2023 rest0.7 Not Affected

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N