Home/CVE/A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_f
CVE
CVE-2026-6596
A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_f
A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_file of the file src/backend/base/Langflow/api/v1/endpoints.py of the component API Endpoint. The manipulation results in unrestricted upload.
It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
HIGH · CVSS 7.3
EPSS 0.00054
EPSS exploitation odds0.05% · top 82%
Schedule remediation
- CVSS base score ≥ 7.0
No Sigma yet — build one →
YARA rules0
Look this up elsewhere - one-click external pivots
▸
How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2026-6596, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
EPSS exploitation probability
0.05%
Top 82%odds of exploitation in the next 30 days
CVSS metric silhouette
shape grows toward worst-case
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Tech impact
partial
CVSS vector breakdown
Exploitability - how they get in
Attack Vector
Network
Adjacent
Local
Physical
Attack Complexity
Low
High
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Impact - what breaks
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:LLifecycle
- 20 Apr 2026Published to NVD
- 29 Apr 2026Last modified
Every entry is a recorded date - NVD publish/modify, CISA KEV add, public exploit disclosure. No inferred events.
◆
ATT&CK techniques
1Techniques this CVE enables - linked via CWE → CAPEC → ATT&CK. Pills with a solid outline are named directly in ATT&CK or Nuclei templates (high confidence); the others are linked through weakness mappings.
▤ Build a SIEM detection for these techniques▤
CAPEC attack patterns
12Attack patterns this CVE enables - the bridge from weakness to ATT&CK technique.
CAPEC-CAPEC-1 · Accessing Functionality Not Properly Constrained by ACLs CAPEC-CAPEC-19 · Embedding Scripts within Scripts CAPEC-CAPEC-441 · Malicious Logic Insertion CAPEC-CAPEC-478 · Modification of Windows Service Configuration CAPEC-CAPEC-479 · Malicious Root Certificate CAPEC-CAPEC-502 · Intent Spoof CAPEC-CAPEC-503 · WebView Exposure CAPEC-CAPEC-536 · Data Injected During Configuration CAPEC-CAPEC-546 · Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-CAPEC-550 · Install New Service CAPEC-CAPEC-551 · Modify Existing Service CAPEC-CAPEC-552 · Install Rootkit
⬡
Weakness Classification
▤
Affected Packages
1Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI
langflow-base
MEDIUM
fixed in 0.9.1
▤
Related CVEs
8CVEs linked to this one by a shared weakness (CWE) or affected product - joins on data already in the engine, with the reason shown per row. Not a guess.
CVE-2001-0781
Buffer overflow in SpoonFTP 1.0.0.12 allows remote attackers to execute arbitrar...
same CWE-284
CVE-2008-2947
Cross-domain vulnerability in Microsoft Internet Explorer 5.01 SP4, 6, and 7 all...
same CWE-284
CVE-2009-2092
IBM WebSphere Application Server (WAS) 7.0 before 7.0.0.5 does not properly read...
same CWE-284
CVE-2009-2631
Multiple clientless SSL VPN products that run in web browsers, including Stoneso...
same CWE-284
CVE-1999-0036
IRIX login program with a nonzero LOCKOUT parameter allows creation or damage to...
same CWE-434
HIGH
CVE-2001-0340
An interaction between the Outlook Web Access (OWA) service in Microsoft Exchang...
same CWE-434
CVE-2001-1099
The default configuration of Norton AntiVirus for Microsoft Exchange 2000 2.x al...
same CWE-434
CVE-2001-0901
Hypermail allows remote attackers to execute arbitrary commands on a server supp...
same CWE-434
🔗
References & Sources
4Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.