Bug#1142715: librest: CVE-2026-16615

[Salvatore Bonaccorso]

Source: librest
Version: 0.10.2-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/librest/-/issues/25
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for librest.

CVE-2026-16615[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-16615
    https://www.cve.org/CVERecord?id=CVE-2026-16615
[1] https://gitlab.gnome.org/GNOME/librest/-/issues/25

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore