CVE-2026-12940

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-30. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

IBM Langflow OSS 1.0.0 through 1.10.1  are vulnerable to unauthenticated remote code execution via environment variable injection in the MCP (Model Context Protocol) stdio launcher. The vulnerability exists in src/lfx/src/lfx/base/mcp/util.py where the DANGEROUS_ENV_VARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

July 30, 2026

Last Modified

July 31, 2026

Advisory Details (1)

Auto-updated Jul 31, 2026
No patch confirmed yet.
generic

Security Bulletin: Langflow is affected by remote code execution, denial of service, path traversal, and exposed credentials due to multiple unauthenticated and insufficiently authorized API endpoints

https://www.ibm.com/support/pages/node/7279995

Vendor Advisories for CVE-2026-12940(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 20× 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. 2026-08-01 04:15 UTCEPSS rescore
  2. 2026-08-01 03:07 UTCGHSA enrichment
  3. 2026-07-31 23:19 UTCGHSA enrichment
  4. 2026-07-31 19:29 UTCGHSA enrichment
  5. 2026-07-31 15:38 UTCGHSA enrichment
  6. 2026-07-31 11:52 UTCGHSA enrichment
  7. 2026-07-31 08:05 UTCGHSA enrichment
  8. 2026-07-31 04:18 UTCEG score recompute
  9. 2026-07-31 04:18 UTCGHSA enrichment
  10. 2026-07-31 04:07 UTCEG score recompute
  11. 2026-07-31 04:07 UTCGHSA enrichment
  12. 2026-07-31 03:04 UTCGHSA enrichment
  13. 2026-07-30 23:17 UTCGHSA enrichment
  14. 2026-07-30 19:30 UTCGHSA enrichment
  15. 2026-07-30 19:09 UTCEG score recompute
  16. 2026-07-30 19:09 UTCGHSA enrichment
  17. 2026-07-30 18:30 UTCEG score recompute
  18. 2026-07-30 17:24 UTCEG score recompute
  19. 2026-07-30 16:48 UTCEG score recompute
  20. 2026-07-30 16:46 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12940?
CVE-2026-12940 is a critical vulnerability published on July 30, 2026. IBM Langflow OSS 1.0.0 through 1.10.1 are vulnerable to unauthenticated remote code execution via environment variable injection in the MCP (Model Context Protocol) stdio launcher. The vulnerability exists in src/lfx/src/lfx/base/mcp/util.py where the DANGEROUSENVVARS blocklist fails to include…
When was CVE-2026-12940 disclosed?
CVE-2026-12940 was first published in the National Vulnerability Database on July 30, 2026, with the most recent update on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12940 actively exploited?
CVE-2026-12940 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.3% of all scored CVEs.
What is the CVSS score of CVE-2026-12940?
CVE-2026-12940 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-12940?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12940, 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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