CVE-2026-16615
Fixed in a distro release EPSS <1%CVSS 6.8
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.
Products: GNOME librest, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | rest | 0.9.1-11.el10_2.1 |
| AlmaLinux 10 | rest-devel | 0.9.1-11.el10_2.1 |
| Debian 12 | librest | no fix |
| Debian 13 | librest | no fix |
| Debian 14 | librest | no fix |
| Red Hat Enterprise Linux 10.2 | rest | 0:0.9.1-11.el10_2.1 |
| Red Hat Enterprise Linux 10.2 | rest-debuginfo | 0:0.9.1-11.el10_2.1 |
| Red Hat Enterprise Linux 10.2 | rest-debugsource | 0:0.9.1-11.el10_2.1 |
| Red Hat Enterprise Linux 10.2 | rest-demo-debuginfo | 0:0.9.1-11.el10_2.1 |
| Red Hat Enterprise Linux 10.2 | rest-devel | 0:0.9.1-11.el10_2.1 |
| Red Hat Enterprise Linux eus 10.0 | rest | 0:0.9.1-11.el10_0.1 |
| Red Hat Enterprise Linux eus 10.0 | rest-debuginfo | 0:0.9.1-11.el10_0.1 |
| Red Hat Enterprise Linux eus 10.0 | rest-debugsource | 0:0.9.1-11.el10_0.1 |
| Red Hat Enterprise Linux eus 10.0 | rest-demo-debuginfo | 0:0.9.1-11.el10_0.1 |
| Red Hat Enterprise Linux eus 10.0 | rest-devel | 0:0.9.1-11.el10_0.1 |
| Rocky Linux 10 | rest | 0:0.9.1-11.el10_2.1 |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP7 | librest | 0.9.1-150600.3.3.1 |
| SUSE Linux Enterprise Server 16.0 | librest | 0.9.1-160000.3.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | librest | 0.8.0-13.3.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | librest | 0.9.1-160000.3.1 |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | librest0_7 | 0.8.1-150600.4.3.1 |
| Ubuntu 16.04 LTS | librest | no fix |
| Ubuntu 18.04 LTS | librest | no fix |
| Ubuntu 20.04 LTS | librest | no fix |
| Ubuntu 22.04 LTS | librest | no fix |
| Ubuntu 24.04 LTS | librest | no fix |
| Ubuntu 26.04 LTS | librest | no fix |
| Ubuntu 26.10 | librest | no fix |
| openSUSE Leap 16.0 | librest | 0.9.1-160000.3.1 |
| openSUSE Leap 16.0 | librest0_7 | 0.8.1-bp160.2.1 |
| openSUSE Tumbleweed | librest | 0.10.2-2.1 |