CVE-2026-9205Network attack vectorHinoki check available

Protected-data compromise via weak 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 remote attackers to read or alter Fernet-protected data. IBM identifies ensure_fernet_key() as the affected locus but has not disclosed how the function derives a weak key from untrusted input. Exploitation requires no account or user interaction, but IBM rates the attack as high complexity; successful use compromises protected data without interrupting service.

CVSS severity7.4
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Weak key derivation in IBM Langflow OSS 1.0.0 through 1.10.3 allows remote attackers to read or alter Fernet-protected data. IBM identifies ensure_fernet_key() as the affected locus but has not disclosed how the function derives a weak key from untrusted input. Exploitation requires no account or user interaction, but IBM rates the attack as high complexity; successful use compromises protected data without interrupting service.

The record

CVE
CVE-2026-9205
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-338, 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

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.4IBM CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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 IPsNo honeypot observations are available for this CVE in the selected window.

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-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
T1555Credentials from Password Stores

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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