CVE-2025-3248Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via exposed validation endpoint

Published Apr 7, 2025 · Updated Jul 14, 2026

Code injection in Langflow before 1.3.0 allows remote attackers to execute arbitrary code through the unauthenticated validation API. The validate_code path passes submitted Python to exec while loading a temporary module, so decorators and default-argument expressions run immediately. Network access to the endpoint is sufficient to run commands with the privileges and data access of the Langflow server process.

CVSS severity9.8
Critical
EPSS probability99.99%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Langflow before 1.3.0 allows remote attackers to execute arbitrary code through the unauthenticated validation API. The validate_code path passes submitted Python to exec while loading a temporary module, so decorators and default-argument expressions run immediately. Network access to the endpoint is sufficient to run commands with the privileges and data access of the Langflow server process.

The record

CVE
CVE-2025-3248
Published
Apr 7, 2025
Updated
Jul 14, 2026
Vendor
Langflow
Product
Langflow
Classifications
CWE-94, CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2025CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry
  3. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Langflow · Langflowversion=0 <1.3.0

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsShadowserver observations through Sep 15, 2026. Gaps indicate unavailable data.
Sep 9, 2026Sep 15, 2026
View daily counts
Reporting dayUnique IPs
Sep 9, 2026Unavailable
Sep 10, 2026Unavailable
Sep 11, 2026Unavailable
Sep 12, 2026Unavailable
Sep 13, 2026Unavailable
Sep 14, 202617
Sep 15, 202620
Latest reporting daySep 15, 2026
Latest daily unique IPs20
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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