CVE-2026-16615

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.

Score
CVSS 3.1 6.8 Medium
Status
Awaiting Analysis - secalert@redhat.com
Published
2026-07-22
Last modified
2026-09-01
Weaknesses
CWE-338

Affected products

References

 
 
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