CVE-2026-8470Network attack vector

Credential decryption via deterministic Fernet key derivation

Published Aug 5, 2026 · Updated Aug 5, 2026

Weak key derivation in IBM Langflow OSS 1.0.0 through 1.10.3 allows attackers to reproduce Fernet keys and decrypt stored credentials. The ensure_fernet_key path seeds Python's Mersenne Twister with a secret shorter than 32 characters and uses its output as the 32-byte Fernet key. Exploitation requires that non-default short-secret configuration and access to both the configured secret and encrypted database contents.

CVSS severity7.4
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak key derivation in IBM Langflow OSS 1.0.0 through 1.10.3 allows attackers to reproduce Fernet keys and decrypt stored credentials. The ensure_fernet_key path seeds Python's Mersenne Twister with a secret shorter than 32 characters and uses its output as the 32-byte Fernet key. Exploitation requires that non-default short-secret configuration and access to both the configured secret and encrypted database contents.

The record

CVE
CVE-2026-8470
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-327, T1555
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=1.0.0 <=1.10.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Langflow OSSversion=1.0.0 <=1.10.3

Published CVSS scores

7.4IBM CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1555Credentials from Password Stores

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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