CVE-2026-55446

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% 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, secondary
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
24.0%
KEV
Not listed

Published

June 19, 2026

Last Modified

June 24, 2026

Advisory Details (2)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github.
github Patch Available🟡 PoC Available

Unauthenticated DoS through multipart form boundary file upload · Advisory · langflow-ai/langflow · GitHub

https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9
github_pr

fix: security file upload

Fix merged in langflow-ai/langflow PR #3923 on 2024-09-30 — awaiting tagged release

https://github.com/langflow-ai/langflow/pull/3923

Vendor Advisories for CVE-2026-55446(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
langflow0.0.31 ... 1.0.9 (243 versions)1.0.19—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 52× 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.

  1. 2026-07-07 00:07 UTCEG score recompute
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 11:41 UTCEG score recompute
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 23:10 UTCEG score recompute
  8. 2026-07-05 10:37 UTCEG score recompute
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 22:09 UTCEG score recompute
  12. 2026-07-04 09:43 UTCEG score recompute
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 21:17 UTCEG score recompute
  16. 2026-07-03 08:51 UTCEG score recompute
  17. 2026-07-02 20:25 UTCEG score recompute
  18. 2026-07-02 08:00 UTCEG score recompute
  19. 2026-07-01 19:33 UTCEG score recompute
  20. 2026-07-01 15:07 UTCEPSS rescore
  21. 2026-07-01 07:07 UTCEG score recompute
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 18:41 UTCEG score recompute
  24. 2026-06-30 06:15 UTCEG score recompute
  25. 2026-06-29 17:50 UTCEG score recompute
Show 27 more
  1. 2026-06-29 14:06 UTCEPSS rescore
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-29 05:24 UTCEG score recompute
  4. 2026-06-28 16:52 UTCEG score recompute
  5. 2026-06-28 14:07 UTCEPSS rescore
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-28 04:56 UTCEPSS rescore
  8. 2026-06-28 04:26 UTCEG score recompute
  9. 2026-06-27 16:00 UTCEG score recompute
  10. 2026-06-27 03:32 UTCEG score recompute
  11. 2026-06-27 03:08 UTCEPSS rescore
  12. 2026-06-26 15:05 UTCEG score recompute
  13. 2026-06-26 02:39 UTCEG score recompute
  14. 2026-06-25 14:13 UTCEG score recompute
  15. 2026-06-25 13:49 UTCEPSS rescore
  16. 2026-06-25 01:47 UTCEG score recompute
  17. 2026-06-24 14:05 UTCEPSS rescore
  18. 2026-06-24 13:22 UTCEG score recompute
  19. 2026-06-24 00:56 UTCEG score recompute
  20. 2026-06-23 12:30 UTCEG score recompute
  21. 2026-06-23 00:00 UTCEG score recompute
  22. 2026-06-22 11:34 UTCEG score recompute
  23. 2026-06-21 23:09 UTCEG score recompute
  24. 2026-06-21 10:43 UTCEG score recompute
  25. 2026-06-20 22:17 UTCEG score recompute
  26. 2026-06-20 09:51 UTCEG score recompute
  27. 2026-06-19 21:23 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-55446?
CVE-2026-55446 is a high vulnerability published on June 19, 2026. Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an…
When was CVE-2026-55446 disclosed?
CVE-2026-55446 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55446 actively exploited?
CVE-2026-55446 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55446?
CVE-2026-55446 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-55446?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55446, 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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