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[NEW] [medium] Red Hat Enterprise Linux (python-idna): Vulnerability Enables Denial of Service

mediumCVE-2026-45409
A remote, anonymous attacker can exploit a vulnerability in Red Hat Enterprise Linux (python-idna) to conduct a denial of service attack.

CSIRTS triage

What
A denial of service vulnerability allows remote anonymous attackers to disrupt service availability.
Who is affected
All deployments of python-idna in Red Hat Enterprise Linux are affected.
Urgency
Medium priority; not currently exploited but denials of service can impact availability.
Action
Update python-idna to a patched version when available from Red Hat.

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

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Details

Source
CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity
medium
Published
2026-08-14
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2797

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45409coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Red Hat Enterprise

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.

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