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Back to active CVEs
Medium · CVSS 6.8CVE-2026-16615

Librest: weak random number generation in pkce implementationCVE-2026-16615

Answer in brief

CVE-2026-16615 records a Medium severity (CVSS 6.8) vulnerability in Librest: weak random number generation in pkce implementation. The current sources do not mark it as known exploited. The current feed maps GNOME/librest (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 22, 2026Updated Sep 1, 2026Source checked Oct 16, 2026First seen by HOL Sep 1, 2026Material review Sep 1, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps GNOME/librest (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
GNOME/librestgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for GNOME/librest.
  2. 2Review the reported fix. Source-reported workaround: 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.

Evidence timeline and material changes

  1. Published upstream

    Jul 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 1, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencegitlab.gnome.org
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

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  • JavaCV: Integer Overflow in IPCameraFrameGrabber Causes Infinite-Loop DoSSame generic ecosystem
  • IBM i is Affected By An Improper Privilege Management VulnerabilitySame generic ecosystem
  • LoopX serve-status permissive CORS policy exposes control-plane state and private Markdown filesSame generic ecosystem
  • ERPNext: Unauthorised access to financial data due to missing validationSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-338
Source
CVE List V5
Source checked
Oct 16, 2026
References
5 linked sources
Open source record