USN-8549-1: idna vulnerability
It was discovered that idna did not properly reject oversized inputs before performing expensive processing. An attacker could possibly use this issue to cause idna to consume significant resources, leading to a denial of service.
CSIRTS triage
- What
- idna did not properly handle oversized inputs, leading to potential denial of service.
- Who is affected
- Users of idna that process inputs.
- Urgency
- Remediation is necessary to avoid service disruption.
- Action
- Users should update idna to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch idna
Get an email when a new idna advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://ubuntu.com/security/notices/USN-8549-1
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 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.
More from Ubuntu Security Notices
- highUSN-8620-4: Linux kernel (Intel IoTG) vulnerabilities2026-07-31
- highUSN-8620-3: Linux kernel (Intel IoTG) vulnerabilities2026-07-31
- unknownUSN-8625-1: OpenSSL vulnerability2026-07-30
- unknownUSN-8624-1: Sinatra vulnerability2026-07-29
- unknownUSN-8623-1: Linux kernel (NVIDIA) vulnerabilities2026-07-29