---
title: "Security digest: June 25, 2026"
url: https://erroneo.us/security/2026-06-25/
description: "June 25, 2026 vulnerability digest: 2 CISA KEV additions (Cisco, PTC); 10 critical advisories (Go, PyPI, npm). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2026-06-25
date_modified: 2026-06-25
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: June 25, 2026

2 known exploited (cisa kev) additions and 10 critical advisories.

## Take stock

- Do you run any of these? Cisco Unified Communications Manager, PTC Windchill and FlexPLM. They are being exploited in the wild (CISA KEV). Patch or mitigate if you do; CISA’s federal deadline is 2026-06-28.
- Go: 7 critical advisories ( golang.org/x/crypto ). Check with govulncheck ./... .
- npm: 2 critical advisories ( i18next-http-middleware , i18next-fs-backend ). Check with npm audit (or: npm ls <package>) .
- PyPI: 1 critical advisory ( lemur ). Check with pip-audit (or: pip show <package>) .
- 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-2026-20230](https://erroneo.us/security/cve/CVE-2026-20230/index.md) Cisco Unified Communications Manager: Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability (CISA due 2026-06-28)
- [CVE-2026-12569](https://erroneo.us/security/cve/CVE-2026-12569/index.md) PTC Windchill and FlexPLM: PTC Windchill and FlexPLM Improper Input Validation Vulnerability (CISA due 2026-06-28)

## Critical advisories

- [CVE-2026-46595](https://erroneo.us/security/cve/CVE-2026-46595/index.md) golang.org/x/crypto: Invoking VerifiedPublicKeyCallback permissions skip enforcement — Go golang.org/x/crypto < 0.52.0 → 0.52.0
- [CVE-2026-39830](https://erroneo.us/security/cve/CVE-2026-39830/index.md) golang.org/x/crypto: Invoking client can cause server deadlock on unexpected responses — Go golang.org/x/crypto < 0.52.0 → 0.52.0
- [CVE-2026-55166](https://erroneo.us/security/cve/CVE-2026-55166/index.md) Lemur: ACME SSRF + creator-equality IDOR lead to AWS IAM/PKI compromise — PyPI lemur < 1.9.2 → 1.9.2
- [CVE-2026-39834](https://erroneo.us/security/cve/CVE-2026-39834/index.md) golang.org/x/crypto vulnerable to infinite loop on large channel writes — Go golang.org/x/crypto < 0.52.0 → 0.52.0
- [CVE-2026-39833](https://erroneo.us/security/cve/CVE-2026-39833/index.md) golang.org/x/crypto doesn't enforce invoking key constraints — Go golang.org/x/crypto < 0.52.0 → 0.52.0
- [CVE-2026-39832](https://erroneo.us/security/cve/CVE-2026-39832/index.md) golang.org/x/crypto doesn't drop invoking agent constraints when forwarding keys — Go golang.org/x/crypto < 0.52.0 → 0.52.0
- [CVE-2026-48714](https://erroneo.us/security/cve/CVE-2026-48714/index.md) i18next-http-middleware: MissingKeyHandler does not reject keys whose segments contain prototype-polluting names — npm i18next-http-middleware < 3.9.7 → 3.9.7
- [CVE-2026-39831](https://erroneo.us/security/cve/CVE-2026-39831/index.md) golang.org/x/crypto: FIDO/U2F security key physical presence check can be bypassed — Go golang.org/x/crypto < 0.52.0 → 0.52.0
- [CVE-2026-42508](https://erroneo.us/security/cve/CVE-2026-42508/index.md) golang.org/x/crypto vulnerable to auth bypass via unenforced @revoked status — Go golang.org/x/crypto < 0.52.0 → 0.52.0
- [CVE-2026-48713](https://erroneo.us/security/cve/CVE-2026-48713/index.md) i18next-fs-backend vulnerable to prototype pollution via crafted missing-key string — npm i18next-fs-backend < 2.6.6 → 2.6.6

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Source page: https://erroneo.us/security/2026-06-25/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt