CVE-2026-54282: Starlette is a lightweight ASGI framework/toolkit

Routine

LOW 3.7REMOTEUPGRADE

CVE-2026-54282 is a low-severity flaw (CVSS 3.7) 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. Prior to 1.3.0, the HTTP request path is not validated before being used to reconstruct request.url. Because request.url is rebuilt by concatenating {scheme}://{host}{path} and re-parsing the result, a path that does not begin with / (for example @google.com) moves the authority boundary during re-parsing, so request.url.hostname and request.url.netloc become attacker-controlled. Code that reads

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-706
Published	2026-06-22
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

2026-06-22 18:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

encode starlette UPGRADE

Affected: < 1.3.0

Fixed in: 1.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show starlette

2. UPGRADE to 1.3.0

pip install --upgrade "starlette>=1.3.0"

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-2026-54282?

starlette: upgrade to 1.3.0. Exact commands for each OS are on this page.

Is CVE-2026-54282 being exploited?

CVE-2026-54282 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-2026-54282 affect?

CVE-2026-54282 affects starlette. Severity is low (CVSS 3.7). Starlette is a lightweight ASGI framework/toolkit. Prior to 1.3.0, the HTTP request path is not validated before being used to reconstruct request.url. Because request.url is rebuilt by concatenating {scheme}://{host}{path} and re-parsing t

How urgent is CVE-2026-54282?

Priority 23/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-54283 HIGH 7.5 UPGRADE Starlette is a lightweight ASGI framework/toolkit
CVE-2026-48817 MEDIUM 5.3 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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