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.
Metrics
Affected Vendors & Products
References
History
Wed, 22 Jul 2026 17:30:00 +0000
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ssvc
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Wed, 22 Jul 2026 16:30:00 +0000
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| 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. | |
| Title | Librest: weak random number generation in pkce implementation | |
| First Time appeared |
Redhat
Redhat enterprise Linux |
|
| Weaknesses | CWE-338 | |
| CPEs | cpe:/o:redhat:enterprise_linux:10 | |
| Vendors & Products |
Redhat
Redhat enterprise Linux |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-07-22T16:43:38.173Z
Reserved: 2026-07-22T14:38:37.901Z
Link: CVE-2026-16615
Updated: 2026-07-22T16:43:31.917Z
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OpenCVE Enrichment
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