CVE-2024-26329Public exploitNetwork attack vector

Sensitive-data exposure via recoverable PRNG state

Published Apr 5, 2024 · Updated Nov 14, 2024

Insufficient entropy in Chilkat before 9.5.0.98 allows attackers to recover sensitive cryptographic material via observable PRNG outputs. ChilkatRand::randomBytes uses the linear R250 generator for cryptographic operations; after 250 consecutive outputs, its XOR-derived state reveals past and future outputs. Exploitation requires an application path that exposes enough outputs during one process lifetime, after which keys can be recovered and protected data decrypted or altered.

CVSS severity6.2
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient entropy in Chilkat before 9.5.0.98 allows attackers to recover sensitive cryptographic material via observable PRNG outputs. ChilkatRand::randomBytes uses the linear R250 generator for cryptographic operations; after 250 consecutive outputs, its XOR-derived state reveals past and future outputs. Exploitation requires an application path that exposes enough outputs during one process lifetime, after which keys can be recovered and protected data decrypted or altered.

The record

CVE
CVE-2024-26329
Published
Apr 5, 2024
Updated
Nov 14, 2024
Vendor
Chilkat Software, Inc.
Product
Chilkat
Classifications
CWE-331, CWE-330, CWE-338
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 14, 2024Record 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=0 <9.5.0.98

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chilkat Software, Inc. · Chilkatversion=0 <9.5.0.98

Published CVSS scores

7.4X41 D-SecCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
6.2CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-331Insufficient Entropy
CWE-330Use of Insufficiently Random Values
CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Public exploit references

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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