---
title: "Security digest: April 23, 2026"
url: https://erroneo.us/security/2026-04-23/
description: "April 23, 2026 vulnerability digest: 1 CISA KEV addition (Marimo); 5 critical advisories (RubyGems, Go, PyPI, NuGet). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2026-04-23
date_modified: 2026-04-23
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: April 23, 2026

1 known exploited (cisa kev) addition and 5 critical advisories.

## Take stock

- Do you run any of these? Marimo Marimo. They are being exploited in the wild (CISA KEV). Patch or mitigate if you do; CISA’s federal deadline is 2026-05-07.
- RubyGems: 2 critical advisories ( openc3 ). Check with bundle audit check --update .
- Go: 1 critical advisory ( heckel.io/ntfy/v2 ). Check with govulncheck ./... .
- PyPI: 1 critical advisory ( pipecat-ai ). Check with pip-audit (or: pip show <package>) .
- NuGet: 1 critical advisory ( Microsoft.AspNetCore.DataProtection ). Check with dotnet list package --vulnerable --include-transitive .
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Known exploited (CISA KEV)

- [CVE-2026-39987](https://erroneo.us/security/cve/CVE-2026-39987/index.md) Marimo Marimo: Marimo Remote Code Execution Vulnerability (CISA due 2026-05-07)

## Critical advisories

- [CVE-2026-42087](https://erroneo.us/security/cve/CVE-2026-42087/index.md) OpenC3 COSMOS has SQL Injection in QuestDB Time-Series Database — RubyGems openc3 >= 6.7.0, < 7.0.0-rc3 → 7.0.0-rc3
- [CVE-2026-39087](https://erroneo.us/security/cve/CVE-2026-39087/index.md) ntfy.sh allows a remote attacker to execute arbitrary code via the parseActions function — Go heckel.io/ntfy/v2 < 2.22.0 → 2.22.0
- [CVE-2025-62373](https://erroneo.us/security/cve/CVE-2025-62373/index.md) Pipecat: Remote Code Execution by Pickle Deserialization Through LivekitFrameSerializer — PyPI pipecat-ai >= 0.0.41, < 0.0.94 → 0.0.94
- [CVE-2026-40372](https://erroneo.us/security/cve/CVE-2026-40372/index.md) Microsoft Security Advisory CVE-2026-40372 – ASP.NET Core Elevation of Privilege — NuGet Microsoft.AspNetCore.DataProtection >= 10.0.0, <= 10.0.6 → 10.0.7
- [GHSA-2wvh-87g2-89hr](https://erroneo.us/security/ghsa/GHSA-2wvh-87g2-89hr/index.md) OpenC3 COSMOS: Permissions Bypass Provides User Access to Unassigned Administrative Actions via Script Runner Tool — RubyGems openc3 < 7.0.0-rc3 → 7.0.0-rc3

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Source page: https://erroneo.us/security/2026-04-23/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt