How severe is CVE-2023-30798?

CVE-2023-30798 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-30798 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-30798?

CVE-2023-30798 affects Encode Starlette. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-30798?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-30798 published?

CVE-2023-30798 was published on 2023-04-21 and last updated on 2026-06-17.

CVE-2023-30798

CVE-2023-30798 is a high-severity vulnerability in Encode Starlette with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Encode Starlette
Published: 2023-04-21
Last modified: 2026-06-17

Description

There MultipartParser usage in Encode's Starlette python framework before versions 0.25.0 allows an unauthenticated and remote attacker to specify any number of form fields or files which can cause excessive memory usage resulting in denial of service of the HTTP service.

Frequently asked questions

What is CVE-2023-30798?: There MultipartParser usage in Encode's Starlette python framework before versions 0.25.0 allows an unauthenticated and remote attacker to specify any number of form fields or files which can cause excessive memory usage resulting in denial of service of the HTTP service.
How severe is CVE-2023-30798?: CVE-2023-30798 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-30798 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-30798?: CVE-2023-30798 affects Encode Starlette. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-30798?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-30798 published?: CVE-2023-30798 was published on 2023-04-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:*

More vulnerabilities in Encode Starlette

CVE-2026-54283 — High (CVSS 7.5): Starlette is a lightweight ASGI framework/toolkit. From 0.4.1 until 1.3.1, request.form() accepts max_fields and…
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CVE-2023-29159 — High (CVSS 7.5): Directory traversal vulnerability in Starlette versions 0.13.5 and later and prior to 0.27.0 allows a remote…
CVE-2026-48710 — Medium (CVSS 6.5): Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not…
CVE-2026-48817 — Medium (CVSS 5.3): Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and below, when dispatching a request,…
CVE-2026-54282 — 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…

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