PYSEC-2026-1807

    Dashboard / Vulnerabilities / PYSEC-2026-1807

    PYSEC-2026-1807

    Published: 7 Jul 2026Last Modified: 7 Jul 2026

    Summary: pubnub Insufficient Entropy vulnerability

    Details: Versions of the package pubnub before 7.4.0; all versions of the package com.pubnub:pubnub; versions of the package pubnub before 6.19.0; all versions of the package github.com/pubnub/go; versions of the package github.com/pubnub/go/v7 before 7.2.0; versions of the package pubnub before 7.3.0; versions of the package pubnub/pubnub before 6.1.0; versions of the package pubnub before 5.3.0; versions of the package pubnub before 0.4.0; versions of the package pubnub/c-core before 4.5.0; versions of the package com.pubnub:pubnub-kotlin before 7.7.0; versions of the package pubnub/swift before 6.2.0; versions of the package pubnub before 5.2.0; versions of the package pubnub before 4.3.0 are vulnerable to Insufficient Entropy via the getKey function, due to inefficient implementation of the AES-256-CBC cryptographic algorithm. The provided encrypt function is less secure when hex encoding and trimming are applied, leaving half of the bits in the key always the same for every encoded message or file. **Note:** In order to exploit this vulnerability, the attacker needs to invest resources in preparing the attack and brute-force the encryption.

    References: https://nvd.nist.gov/vuln/detail/CVE-2023-26154, https://github.com/pubnub/go/commit/428517fef5b901db7275d9f5a75eda89a4c28e08, https://github.com/pubnub/javascript/commit/fb6cd0417cbb4ba87ea2d5d86a9c94774447e119, https://security.snyk.io/vuln/SNYK-UNMANAGED-PUBNUBCCORE-6098379, https://security.snyk.io/vuln/SNYK-SWIFT-PUBNUBSWIFT-6098381, https://security.snyk.io/vuln/SNYK-RUST-PUBNUB-6098378, https://security.snyk.io/vuln/SNYK-RUBY-PUBNUB-6098377, https://security.snyk.io/vuln/SNYK-PYTHON-PUBNUB-6098375, https://security.snyk.io/vuln/SNYK-PUB-PUBNUB-6098385, https://security.snyk.io/vuln/SNYK-PHP-PUBNUBPUBNUB-6098376, https://security.snyk.io/vuln/SNYK-JS-PUBNUB-5840690, https://security.snyk.io/vuln/SNYK-JAVA-COMPUBNUB-6098380, https://security.snyk.io/vuln/SNYK-JAVA-COMPUBNUB-6098371, https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPUBNUBGOV7-6098374, https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPUBNUBGO-6098373, https://security.snyk.io/vuln/SNYK-DOTNET-PUBNUB-6098372, https://security.snyk.io/vuln/SNYK-COCOAPODS-PUBNUB-6098384, https://github.com/rubysec/ruby-advisory-db/blob/master/gems/pubnub/CVE-2023-26154.yml, https://github.com/pubnub/javascript/blob/master/src/crypto/modules/web.js#L70, https://github.com/pubnub/javascript, https://github.com/advisories/GHSA-5844-q3fc-56rh, https://gist.github.com/vargad/20237094fce7a0a28f0723d7ce395bb0, https://pypi.org/project/pubnub

    Affected packages

    Package

    Name: pubnub

    Purl: pkg:pypi/pubnub

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -7.3.0

    Affected versions

    3.3
    3.3.1
    3.3.2
    3.3.4
    3.3.5

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    PYSEC-2026-1807 | CVE-DB