DSA-6478-1 starlette - security update

unknownCVE-2026-48817 CVE-2026-54282 CVE-2026-54283

Several vulnerabilities were discovered in starlette, a lightweight ASGI framework/toolkit, which could result in bypass of authorization checks or denial of service. https://security-tracker.debian.org/tracker/DSA-6478-1

CSIRTS triage

vendor: Starlette product: Starlette Authentication bypass Denial of service

What: Authorization checks can be bypassed and denial of service conditions triggered in Starlette.
Who is affected: Deployments running vulnerable versions of Starlette.
Urgency: Moderate urgency; authorization bypass requires prompt patching to prevent access control violations.
Action: Apply the security update from Debian DSA-6478-1 or upgrade to a patched version of Starlette.

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

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Details

Source: Debian Security Advisories (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-30
Exploitation: Not in CISA KEV at last sync

Original advisory: https://lists.debian.org/debian-security-announce/2026/msg00389.html

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-2026-488170.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-542820.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-542830.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-48817	coverage & exploitation status	NVD · CVE.org
CVE-2026-54282	coverage & exploitation status	NVD · CVE.org
CVE-2026-54283	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 28, 2026)cert-fr-avis
unknownMultiple vulnerabilities in IBM products (July 24, 2026)cert-fr-avis
lowGHSA-jp82-jpqv-5vv3: Starlette: Unvalidated request path concatenated into authority poisons request.url.hostn…ghsa
mediumGHSA-x746-7m8f-x49c: Starlette: Arbitrary HTTP method dispatched to `HTTPEndpoint` attributes via `getattr`ghsa