CVE-2026-48817: Starlette is a lightweight ASGI framework/toolkit

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-48817 is a medium-severity flaw (CVSS 5.3) affecting starlette. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and below, when dispatching a request, HTTPEndpoint selects the handler by lowercasing the HTTP method and looking it up as an attribute with getattr, without restricting the lookup to a known set of HTTP verbs. When an HTTPEndpoint subclass is registered through Route(...) without an explicit methods= argument, the route does not constrain the method and every method reaches th

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-470
Published	2026-06-17
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: encode

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 20:17 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

encode starlette UPGRADE

Affected: < 1.1.0

Fixed in: 1.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show starlette

2. UPGRADE to 1.1.0

pip install --upgrade "starlette>=1.1.0"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-48817?

starlette: upgrade to 1.1.0. Exact commands for each OS are on this page.

Is CVE-2026-48817 being exploited?

CVE-2026-48817 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-48817 affect?

CVE-2026-48817 affects starlette. Severity is medium (CVSS 5.3). Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and below, when dispatching a request, HTTPEndpoint selects the handler by lowercasing the HTTP method and looking it up as an attribute with getattr, without restricting

How urgent is CVE-2026-48817?

Priority 26/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-54283 HIGH 7.5 UPGRADE Starlette is a lightweight ASGI framework/toolkit
CVE-2026-54282 LOW 3.7 UPGRADE Starlette is a lightweight ASGI framework/toolkit
CVE-2026-48710 MEDIUM 6.5 EXPLOITED UPGRADE UPGRADE Kludex Starlette HTTP Request/Response Smuggling Vulnerability

References

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