[NEW] [medium] Red Hat Enterprise Linux (python-idna): Vulnerability Enables Denial of Service
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
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.
- Low exploitation riskCVE-2026-454090.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-45409 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedMultiple vulnerabilities in IBM products (August 14, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in IBM products (July 24, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in IBM products (July 17, 2026)cert-fr-avis
- unknownUSN-8549-1: idna vulnerabilityubuntu
- mediumGHSA-65pc-fj4g-8rjx: Internationalized Domain Names in Applications (IDNA): Specially crafted inputs to idna.e…ghsa
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.
- medium[NEW] [medium] Red Hat Enterprise Linux (yelp, dracut): Multiple vulnerabilitiescert-bund · 2026-08-14
- high[UPDATE] [high] Red Hat Enterprise Linux (Flatpak): Multiple vulnerabilitiescert-bund · 2026-08-14
- high[NEW] [high] Red Hat Enterprise Linux (nodejs:24): Multiple vulnerabilitiescert-bund · 2026-08-14
- medium[NEW] [medium] Red Hat Enterprise Linux (brace-expansion): Vulnerability allows denial of servicecert-bund · 2026-08-14
- medium[UPDATE] [medium] Red Hat Enterprise Linux (p11-kit): Vulnerability allows denial of servicecert-bund · 2026-08-14
- high[NEW] [high] Red Hat Enterprise Linux (python-pip): Vulnerability allows code executioncert-bund · 2026-08-14
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