pubnub Insufficient Entropy vulnerability

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.9 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

• CVE-2023-26154: 0.96% estimated exploitation activity in the next 30 days; percentile 61.70 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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…

Published by the source

7 Jul 2026, 11:45 UTC

Last modified by the source

7 Jul 2026, 17:56 UTC

Source last checked

26 Oct 2026, 12:37 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-5844-q3fc-56rh

2. Revision 1 · created · 24 Oct 2026

   Published from osv record PYSEC-2026-1807

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# Patch Next advisory brief: CVE-2023-26154

Advisory: pubnub Insufficient Entropy vulnerability
IDs: CVE-2023-26154, GHSA-5844-q3fc-56rh
Record: https://patchnext.com/advisories/cve-2023-26154 (revision 2, source checked 26 Oct 2026, 12:37 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: pubnub 7.4.0; com.pubnub:pubnub-kotlin 7.7.0; pubnub/pubnub 6.1.0; github.com/pubnub/go/v6 6.1.1-0.20231016150651-428517fef5b9; github.com/pubnub/go/v7 7.2.0; pubnub 5.3.0; github.com/pubnub/go/v5 5.0.4-0.20231016150651-428517fef5b9; pubnub 0.4.0; pubnub 6.19.0; pubnub 7.3.0; github.com/pubnub/go 0.0.0-20231016150651-428517fef5b9. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm pubnub: affected < 7.4.0; fixed in 7.4.0
- Maven com.pubnub:pubnub: affected <= 4.6.5
- Maven com.pubnub:pubnub-kotlin: affected < 7.7.0; fixed in 7.7.0
- Packagist pubnub/pubnub: affected < 6.1.0; fixed in 6.1.0
- Go github.com/pubnub/go/v6: affected < 6.1.1-0.20231016150651-428517fef5b9; fixed in 6.1.1-0.20231016150651-428517fef5b9
- Go github.com/pubnub/go/v7: affected < 7.2.0; fixed in 7.2.0
- RubyGems pubnub: affected < 5.3.0; fixed in 5.3.0
- Go github.com/pubnub/go/v5: affected < 5.0.4-0.20231016150651-428517fef5b9; fixed in 5.0.4-0.20231016150651-428517fef5b9
- crates.io pubnub: affected < 0.4.0; fixed in 0.4.0
- NuGet pubnub: affected < 6.19.0; fixed in 6.19.0
- PyPI pubnub: affected < 7.3.0; fixed in 7.3.0
- Go github.com/pubnub/go: affected < 0.0.0-20231016150651-428517fef5b9; fixed in 0.0.0-20231016150651-428517fef5b9

## Suggested inspection (read-only)
- `npm ls pubnub --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- Maven com.pubnub:pubnub: check the installed version with your package manager.
- Maven com.pubnub:pubnub-kotlin: check the installed version with your package manager.
- Packagist pubnub/pubnub: check the installed version with your package manager.
- Go github.com/pubnub/go/v6: check the installed version with your package manager.
- Go github.com/pubnub/go/v7: check the installed version with your package manager.
- RubyGems pubnub: check the installed version with your package manager.
- Go github.com/pubnub/go/v5: check the installed version with your package manager.
- crates.io pubnub: check the installed version with your package manager.
- NuGet pubnub: check the installed version with your package manager.
- `python -m pip show pubnub`: prints the installed version. Run with the environment that serves production active.
- Go github.com/pubnub/go: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pubnub, com.pubnub:pubnub, com.pubnub:pubnub-kotlin, pubnub/pubnub, github.com/pubnub/go/v6, github.com/pubnub/go/v7, github.com/pubnub/go/v5, github.com/pubnub/go.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/PYSEC-2026-1807 (OSV record PYSEC-2026-1807 lists affected ranges: PyPI pubnub >=0 <7.3.0 (fixed))
- Verified: https://github.com/advisories/GHSA-5844-q3fc-56rh (GitHub-reviewed advisory GHSA-5844-q3fc-56rh lists affected ranges: npm pubnub >=0 =0 =0 =0 =0 =0 =0 =0 =0 =0 =0 <6.1.1-0.20231016150651-428517fef5b9; Go…)

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