CVE-2026-16615Librest: weak random number generation in pkce implementation
Updated under an hour ago ()
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It affects GNOME librest and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-338
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
GNOME librest gnome:librest (from the name) | All versions | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:0.9.1-11.el10_2.1 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:0.9.1-11.el10_0.1 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:47085vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:62222vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-16615vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2504432issue-tracking, x-refsource-redhat
- https://gitlab.gnome.org/GNOME/librest/-/issues/25
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.