Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allows building public flows without requiring authentication. When the optional data parameter is supplied, the endpoint uses attacker-controlled flow data (containing arbitrary Python code in node definitions) instead of the stored flow data from the database. This code is passed to exec() with zero sandboxing, resulting in unauthenticated remote code execution. This is distinct from CVE-2025-3248, which fixed /api/v1/validate/code by adding authentication. The build_public_tmp endpoint is designed to be unauthenticated (for public flows) but incorrectly accepts attacker-supplied flow data containing arbitrary executable code. This issue has been fixed in version 1.9.0.
CVE-2026-33017
“—” beside the score: it is equal to NVD's CVSS score.
Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-03-25), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.
- Actively exploited in the wild (CISA-KEV) — the reason this is sooner than the SSVC decision on this page at low mission impact
A fix is available — apply it.
- CVSS v3
- 9.8
- EG Score
- 9.8CRITICALhigh confidence
- EG Risk
- 99EG Risk 99/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity98% × 45%Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation100% × 40%Fixed at 100% for a CISA KEV listing: EchelonGraph's rule.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Attend at low mission impact; Act at medium or high.Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high. - EPSS PROB
- 25%
- EPSS %ILE
- 97th
- KEV
- ⚠ Exploited
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 25% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-21). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- CISA KEV and EG-KEV Tier 1 (exploited in the wild)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Act at medium mission impactAttend at low mission impact; Act at medium or high.CISA BOD 26-04: 3 days & forensic triage if the affected system is publicly exposed; 3 days & forensic triage if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Attend at low mission impact; Act at medium or high.
A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)3 days & forensic triage if the affected system is publicly exposed; 3 days & forensic triage if it is not.
In CISA KEV yes (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
CISA required action“Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”
Quoted verbatim from CISA's Known Exploited Vulnerabilities catalog. CISA directs it at US federal civilian executive branch agencies under Binding Operational Directive (BOD) 26-04, which replaced BOD 22-01 on 10 June 2026; it is not EchelonGraph's advice. CISA's notes: https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx · https://nvd.nist.gov/vuln/detail/CVE-2026-33017
Published
March 20, 2026
Last Modified
June 17, 2026
Advisory Details (6)
Auto-updated Oct 19, 2026CVE-2026-33017: How attackers compromised Langflow AI pipelines in 20 hours | Sysdig
https://www.sysdig.com/blog/cve-2026-33017-how-attackers-compromised-langflow-ai-pipelines-in-20-hoursKnown Exploited Vulnerabilities Catalog | CISA
Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33017Unauthenticated Remote Code Execution in Langflow via Public Flow Build Endpoint · Advisory · langflow-ai/langflow · GitHub
https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvxcommit 73b6612e3ef2 (langflow-ai/langflow)
Fix landed in langflow-ai/langflow commit 73b6612e3ef2 — awaiting tagged release
https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0Langflow Unauth RCE · CVE-2025-3248 · GitHub Advisory Database · GitHub
https://github.com/advisories/GHSA-rvqx-wpfh-mfx7Release 1.8.2 · langflow-ai/langflow · GitHub
https://github.com/langflow-ai/langflow/releases/tag/1.8.2Vendor Advisories for CVE-2026-33017(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(1)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| pip | langflow | — | ghsa |
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)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| langflow | 0.0.31 ... 1.8.4 (293 versions) |
| — |
Weakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 15× in last 7d / 60× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 96 of 257 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 161 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-21 18:56 UTCEG score recompute
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-20 20:56 UTCEG score recompute
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-19 22:56 UTCEG score recompute
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-19 00:55 UTCEG score recompute
- 2026-10-18 03:47 UTCEG score recompute
- 2026-10-18 02:55 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-17 04:54 UTCEG score recompute
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-16 06:55 UTCEG score recompute
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-15 08:55 UTCEG score recompute
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-14 10:55 UTCEG score recompute
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-13 12:52 UTCEG score recompute
- 2026-10-12 14:50 UTCEG score recompute
- 2026-10-11 19:56 UTCEG score recompute
- 2026-10-11 17:09 UTCEG score recompute
- 2026-10-11 14:17 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-10 23:34 UTCEG score recompute
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- 2026-10-10 20:00 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-09 21:48 UTCEG score recompute
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-08 20:01 UTCEG score recompute
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-08 01:35 UTCEG score recompute
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-06 16:32 UTCEG score recompute
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-05 18:30 UTCEG score recompute
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-03 15:02 UTCEG score recompute
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-10-02 16:55 UTCEG score recompute
- 2026-10-01 22:31 UTCEG score recompute
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-09-30 17:07 UTCEG score recompute
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-09-29 15:21 UTCEG score recompute
- 2026-09-29 00:39 UTCEG score recompute
- 2026-09-28 17:18 UTCEG score recompute
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-09-27 21:51 UTCCISA KEV update
- 2026-09-27 15:37 UTCEG score recompute
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-09-26 17:34 UTCEG score recompute
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-09-26 02:51 UTCEG score recompute
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 25% · 97th percentile
- 2026-09-25 19:35 UTCCISA KEV update
- 2026-09-25 14:55 UTCCISA KEV update
- 2026-09-24 19:31 UTCCISA KEV update
- 2026-09-24 14:09 UTCEG score recompute
- 2026-09-22 19:36 UTCCISA KEV update
- 2026-09-22 18:08 UTCEG score recompute
- 2026-09-21 23:45 UTCEG score recompute
- 2026-09-21 19:09 UTCCISA KEV update
- 2026-09-18 22:16 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-09-18 19:20 UTCCISA KEV update
- 2026-09-18 14:15 UTCCISA KEV update
- 2026-09-16 14:10 UTCCISA KEV update
- 2026-09-14 19:24 UTCCISA KEV update
- 2026-09-11 18:49 UTCCISA KEV update
- 2026-09-11 17:07 UTCEG score recompute
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-09-10 19:28 UTCCISA KEV update
- 2026-09-09 19:08 UTCCISA KEV update
- 2026-09-08 18:54 UTCCISA KEV update
- 2026-09-06 15:41 UTCEG score recompute
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-09-05 17:39 UTCEG score recompute
- 2026-09-04 17:38 UTCCISA KEV update
- 2026-09-02 17:33 UTCCISA KEV update
- 2026-09-01 06:45 UTCEG score recompute
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-08-31 14:19 UTCCISA KEV update
- 2026-08-30 21:35 UTCEG score recompute
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-08-28 21:44 UTCEG score recompute
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-08-27 17:22 UTCCISA KEV update
- 2026-08-26 17:41 UTCCISA KEV update
- 2026-08-24 18:52 UTCCISA KEV update
- 2026-08-24 14:54 UTCEG score recompute
- 2026-08-24 14:17 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-08-24 11:14 UTCEG score recompute
- 2026-08-21 16:49 UTCCISA KEV update
- 2026-08-21 02:31 UTCEG score recompute
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 96% · 99th percentile
- 2026-08-20 17:06 UTCCISA KEV update
Publicly available exploits
(8 references)Public exploit code is referenced for this CVE (1 Metasploit module, 1 Exploit-DB entry, 5 GitHub PoCs), as is 1 Nuclei detection template. A detection template checks whether a system is affected; it is not necessarily exploit code. Defenders should treat patch urgency accordingly.
- Metasploitexploit/multi/http/langflow_unauth_rce_cve_2026_33017✓ verifiedPublished Aug 11, 2026
Langflow Unauth RCE
Open source ↗ - GitHub PoCCerberusMrXi/Langflow-cve-2026-33017-exploitPublished Jul 19, 2026
CVE-2026-33017 exploitation tool for Langflow <1.9.0. Features reverse shells, command execution, file operations, persistence, and automated testing. Validates critical RCE vulnerability impact. For authorized security assessments only.
Open source ↗ - Exploit-DBEDB-52627Published Jul 8, 2026
Langflow 1.9.0 - RCE
Open source ↗ - GitHub PoCc0gnit00/CVE-2026-33017Published Jul 2, 2026
Python POC, Exploit for CVE-2026-33017
Open source ↗ - Nucleihttp/cves/2026/CVE-2026-33017.yamlPublished Apr 30, 2026
Langflow < 1.9.0 - Remote Code Execution
Open source ↗ - GitHub PoCEQSTLab/CVE-2026-33017Published Mar 31, 2026
Langflow RCE
Open source ↗ - GitHub PoCz4yd3/PoC-CVE-2026-33017Published Mar 27, 2026
CVE-2026-33017: Unauthenticated RCE in Langflow
Open source ↗ - GitHub PoCMaxMnMl/langflow-CVE-2026-33017-pocPublished Mar 21, 2026
CVE-2026-33017 - An unauthenticated remote code execution in Langflow <= 1.8.1 via Public Flow Build Endpoint
Open source ↗
Related CVEs(same product + same CWE)
Same product
10 shownPyPI:langflow
- CVE-2026-10561EG 10.0CRITICAL
- CVE-2026-105697EG 9.9CRITICAL
- CVE-2026-33873EG 9.9CRITICAL
- CVE-2026-33309EG 9.9CRITICAL
- CVE-2026-51886EG 9.8CRITICAL
- CVE-2026-9205EG 9.8CRITICAL
- CVE-2026-8505EG 9.8CRITICAL
- CVE-2026-27966EG 9.8CRITICAL
- CVE-2026-0770EG 9.8 KEVEPSS p99CRITICAL
- CVE-2025-3248EG 9.8 KEVEPSS p100CRITICAL
Same CWE
10 shownCWE-306 · CWE-94
Frequently asked(6)
What is CVE-2026-33017?
When was the CVE record for CVE-2026-33017 published?
Is CVE-2026-33017 actively exploited?
What is the CVSS score of CVE-2026-33017?
Which products are affected by CVE-2026-33017?
How do I remediate CVE-2026-33017?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-33017
Is Your Infrastructure Affected by CVE-2026-33017?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.