PT-2026-63433 · Red Hat · Red Hat Enterprise Linux 10

CVE-2026-16615 · Published 2026-07-22 · Updated 2026-07-22

Mitre

CVSS v3.1

6.8

Medium

Base vector

AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

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.

Fix

Weakness Enumeration

CWE-338

Related Identifiers

CVE-2026-16615

Affected Products

Red Hat Enterprise Linux 10

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-16615 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2504432 · Note
• https://gitlab.gnome.org/GNOME/librest/-/issues/25 · Note
• https://access.redhat.com/security/cve/CVE-2026-16615 · Note