CVE-2026-28356

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.9%, top 25% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

multipart is a fast multipart/form-data parser for python. Prior to 1.2.2, 1.3.1 and 1.4.0-dev, the parse_options_header() function in multipart.py uses a regular expression with an ambiguous alternation, which can cause exponential backtracking (ReDoS) when parsing maliciously crafted HTTP or multipart segment headers. This can be abused for denial of service (DoS) attacks against web applications using this library to parse request headers or multipart/form-data streams. The issue is fixed in 1.2.2, 1.3.1 and 1.4.0-dev.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
44.8%
KEV
Not listed

Published

March 12, 2026

Last Modified

July 10, 2026

Advisory Details (1)

Auto-updated Jun 12, 2026
Patch available. Sources: github.
github Patch Available

Denial of Service via maliciously crafted HTTP or multipart segment headers · Advisory · defnull/multipart · GitHub

https://github.com/defnull/multipart/security/advisories/GHSA-p2m9-wcp5-6qw3

Vendor Advisories for CVE-2026-28356(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-multipart (1.3.0-3ubuntu0.1) @ resolute2026-06-12ubuntu
redhatrhoai/odh-feature-server-rhel9:17763383812026-04-23redhat
redhatrhaiis/model-opt-cuda-rhel9:17745473842026-04-07redhat
redhatrhaiis/vllm-rocm-rhel9:17752525982026-04-07redhat
redhatrhaiis/vllm-cuda-rhel9:17743511442026-03-25redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
multipart0.1 ... 1.2.1 (12 versions)1.2.2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 107 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
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  11. 2026-07-01 15:06 UTCEPSS rescore
  12. 2026-06-30 23:22 UTCEPSS rescore
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  14. 2026-06-29 14:06 UTCEPSS rescore
  15. 2026-06-29 07:02 UTCOSV refresh
  16. 2026-06-28 14:07 UTCEPSS rescore
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  21. 2026-06-25 13:49 UTCEPSS rescore
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  25. 2026-06-23 21:33 UTCEPSS rescore
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  1. 2026-06-23 21:32 UTCEPSS rescore
  2. 2026-06-22 14:25 UTCEPSS rescore
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  4. 2026-06-21 14:56 UTCEPSS rescore
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  6. 2026-06-21 01:59 UTCEPSS rescore
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  8. 2026-06-19 19:25 UTCEPSS rescore
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  10. 2026-06-18 17:52 UTCEPSS rescore
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  19. 2026-06-12 00:15 UTCEG score recompute
  20. 2026-06-12 00:15 UTCVendor advisory
  21. 2026-06-11 14:00 UTCEPSS rescore
  22. 2026-06-10 22:18 UTCEPSS rescore
  23. 2026-06-10 22:18 UTCEPSS rescore
  24. 2026-06-10 18:22 UTCEG score recompute
  25. 2026-06-10 18:22 UTCVendor advisory
  26. 2026-06-10 13:22 UTCEPSS rescore
  27. 2026-06-10 06:06 UTCEG score recompute
  28. 2026-06-10 06:06 UTCVendor advisory
  29. 2026-06-09 16:55 UTCEG score recompute
  30. 2026-06-09 16:55 UTCVendor advisory
  31. 2026-06-08 14:17 UTCEPSS rescore
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  33. 2026-06-08 02:27 UTCEG score recompute
  34. 2026-06-08 02:27 UTCVendor advisory
  35. 2026-06-07 15:25 UTCEPSS rescore
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  37. 2026-06-07 15:25 UTCEPSS rescore
  38. 2026-06-07 14:53 UTCEG score recompute
  39. 2026-06-07 14:53 UTCVendor advisory
  40. 2026-06-06 13:47 UTCEPSS rescore
  41. 2026-06-06 13:47 UTCEPSS rescore
  42. 2026-06-05 22:47 UTCEPSS rescore
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  44. 2026-06-05 06:10 UTCEPSS rescore
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  48. 2026-06-02 20:13 UTCEPSS rescore
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  50. 2026-06-01 13:51 UTCEPSS rescore
  51. 2026-06-01 13:51 UTCEPSS rescore
  52. 2026-06-01 09:43 UTCOSV refresh
  53. 2026-05-31 22:30 UTCEPSS rescore
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  55. 2026-05-31 00:16 UTCEPSS rescore
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  57. 2026-05-29 13:44 UTCEPSS rescore
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  67. 2026-05-26 07:18 UTCEPSS rescore
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  70. 2026-05-24 16:59 UTCEPSS rescore
  71. 2026-05-23 15:21 UTCEPSS rescore
  72. 2026-05-23 00:09 UTCEG score recompute
  73. 2026-05-22 21:16 UTCEPSS rescore
  74. 2026-05-20 22:38 UTCEPSS rescore
  75. 2026-05-20 22:38 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-28356?
CVE-2026-28356 is a high vulnerability published on March 12, 2026. multipart is a fast multipart/form-data parser for python. Prior to 1.2.2, 1.3.1 and 1.4.0-dev, the parseoptionsheader() function in multipart.py uses a regular expression with an ambiguous alternation, which can cause exponential backtracking (ReDoS) when parsing maliciously crafted HTTP or…
When was CVE-2026-28356 disclosed?
CVE-2026-28356 was first published in the National Vulnerability Database on March 12, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28356 actively exploited?
CVE-2026-28356 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-28356?
CVE-2026-28356 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-28356?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28356, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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