7.5

CVE-2026-54283: encode starlette

CVSS: 7.5v3.1HighAnalyzed
AliasesGHSA-82w8-qh3p-5jfqPYSEC-2026-249UBUNTU-CVE-2026-54283
Published 22-06-2026Last modified 23-06-2026
Open JSON

Vulnerability summary

CVE-2026-54283 is a high (CVSS 7.5) vulnerability in encode starlette. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 40.1% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.48%
0%100%
Low · +0.08 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
MGASA-2026-0413OPENSUSE-SU-2026:21053-1SUSE-SU-2026:22360-1CGA-M8X7-8623-6G8W

Timeline

  1. 22-06-2026
    PublishedVulnerability first disclosed.
  2. 23-06-2026
    Last modifiedVulnerability information updated.

Description

Starlette is a lightweight ASGI framework/toolkit. From 0.4.1 until 1.3.1, request.form() accepts max_fields and max_part_size to bound resource consumption while parsing form data. These limits are enforced for multipart/form-data, but silently ignored for application/x-www-form-urlencoded. An unauthenticated attacker can therefore send a urlencoded body with an arbitrarily large number of fields or an arbitrarily large field, even when the application configured limits it believed would apply. This vulnerability is fixed in 1.3.1.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

+0.08 pp

From 0.40% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.48%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard25 products
  • airflow-3< 3.2.2-r6
  • airflow-core-3< 3.2.2-r4
  • airflow-postgres-fips-3< 3.2.2-r2
  • keep-apiAll versions (No fix recorded)
  • keep-api-fipsAll versions (No fix recorded)
Wolfi6 products
  • airflow-3< 3.2.2-r6
  • kserve< 0.20.0-r7
  • kserve-localmodel< 0.20.0-r7
  • kserve-storage-controllerAll versions (No fix recorded) | < 0.20.0-r4
  • mlflow< 3.13.0-r1 | < 3.16.0-r0
Debian1 product
  • starlette< 0.26.1-1+deb12u2 | < 0.46.1-3+deb13u3 | < 1.3.1-1
Encode1 product
Kludex1 product
PyPI1 product
  • starlette≥ 0.4.1, < 1.3.1
Ubuntu1 product
  • starletteAll versions (No fix recorded)

7 vendors · 36 products

References

8 links