CVE-2026-16615: Librest: weak random number generation in pkce implementation

mediumCVSS 6.8CVE-2026-16615

CSIRTS triage

vendor: Librest product: librestOther

What: There is a weak random number generation issue in the PKCE implementation.
Who is affected: Deployments of librest are affected.
Urgency: Remediation is medium urgency due to the potential security risks associated with weak random number generation.
Action: Update to the latest version of librest to mitigate this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 6.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-16615

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-166150.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-16615	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Librest

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] Red Hat Enterprise Linux (librest, pipewire): Multiple vulnerabilitiescert-bund · 2026-07-30
mediumCVE-2026-16615: A flaw was found in librest. The PKCE implementation for OAuth authorization uses the GRand fu…nvd · 2026-07-22