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CVE-2026-79742 IBM CVE debrief

IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to execute arbitrary code due to an incomplete environment variable blocklist. This vulnerability exists in IBM Langflow OSS deployments, potentially impacting systems with remote authenticated access. Defenders should assess exposure, verify blocklist completeness, restrict user access, and monitor logs for suspicious activity. The CVE record was published on 2026-09-10T22:17:00.780Z and has not been modified since then.

Vendor
IBM
Product
Langflow OSS
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-10
Original CVE updated
2026-09-11
Advisory published
2026-09-10
Advisory updated
2026-09-11

Who should care

Defenders responsible for IBM Langflow OSS deployments, security teams managing authenticated user access, and administrators monitoring system logs should assess exposure and prioritize verification and mitigation.

Why it matters

CVE-2026-79742 allows remote authenticated attackers to execute arbitrary code in IBM Langflow OSS 1.0.0-1.11.5 due to an incomplete environment variable blocklist. Defenders should verify blocklist completeness, restrict user access, monitor logs, and prioritize patching.

  • Remote authenticated attackers could execute arbitrary code
  • Defenders must verify blocklist completeness and user access controls
  • System logs should be monitored for suspicious activity
  • Patch or update priority is high for Langflow OSS systems

Technical summary

IBM Langflow OSS 1.0.0 through 1.11.5 contains an incomplete environment variable blocklist, potentially allowing remote authenticated attackers to execute arbitrary code. This issue arises from the blocklist's inability to fully restrict environment variables, which could be exploited by attackers with authenticated access. Defenders should prioritize verifying the blocklist completeness and restricting authenticated user access to mitigate this vulnerability.

Defensive priority

Defenders should prioritize verifying the blocklist completeness and restricting authenticated user access.

Recommended defensive actions

  • Verify the environment variable blocklist completeness in IBM Langflow OSS 1.0.0 through 1.11.5
  • Restrict authenticated user access to Langflow OSS systems
  • Monitor Langflow OSS logs for suspicious activity
  • Apply vendor-provided patches or updates when available

Evidence notes

The CVE description notes an incomplete environment variable blocklist in IBM Langflow OSS 1.0.0 through 1.11.5, which could allow remote authenticated attackers to execute arbitrary code.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-79742 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-79742

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-79742 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-79742

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.