Medium [CVE-2026-16615] weak random number generation in pkce implementation
This medium-severity Red Hat Linux advisory covers CVE-2026-16615 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat package: rest.
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Summary
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.
This allows the attacker to hold a valid access token and impersonate the user, access their protected data and perform actions on their behalf. Due to these reasons, this vulnerability has been rated with an important severity.
Red Hat severity: Important — CVSS 6.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N). Weakness: CWE-338.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat fixing advisory: RHSA-2026:47085, RHSA-2026:62222.
Affected products named by the advisory: Red Hat package: rest.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
- rest-0:0.9.1-11.el10_2.1
- rest-0:0.9.1-11.el10_0.1
- RHSA-2026:47085
- RHSA-2026:62222
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation checklist
- Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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