CVE-2026-128027

frankenphp critical critical vulnerability, CVSS 9.8.

FrankenPHP Docker images before 1.1.11 were rebuilt only when new base image tags were created, so security fixes that Alpine, PHP, and Go applied under existing tags were not propagated. Remote attackers could exploit known flaws in the stale system libraries, such as CVE-2025-15467 in libcrypto3, to execute code.

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9.8CVSS base score: critical, the highest band

0.8%chance of exploitation in the next 30 days (EPSS), 56th percentile

13 Novfirst published, 2026

Not yeton CISA's exploited list, as of 14 November 2026

Vendor and product	php · frankenphp
Type	critical vulnerability
Severity	Critical 9.8 CVSS base score
Affected versions	frankenphp: before 1.1.11
First published	13 November 2026
Weakness	Dependency on Vulnerable Third-Party Component
Exploited	Not confirmed. Critical flaws in php products have been exploited before: php appears on CISA's exploited list.
Advisories	github.com ↗

What to do

Patch before it is exploited

Step 1

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited.

Step 2

If you cannot patch now, restrict network access to the affected product.

Step 3

Check for signs of compromise since the date it was added to the list.

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Questions

CVE-2026-128027 in short

Is CVE-2026-128027 being exploited?

Not confirmed as of 14 November 2026: CISA has not added it to its Known Exploited Vulnerabilities catalogue. Critical flaws in php products are a frequent target, so patch before that changes; this page is updated daily.

How severe is CVE-2026-128027?

NVD rates it critical, with a CVSS base score of 9.8.

Which versions of frankenphp are affected by CVE-2026-128027?

According to the CVE record: frankenphp: before 1.1.11. Check the vendor's advisory for the fixed version.

How do I fix CVE-2026-128027?

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited. If you cannot patch now, restrict network access to the affected product. Check for signs of compromise since the date it was added to the list.

Sources: NVD, the CVE record, FIRST EPSS and the CISA Known Exploited Vulnerabilities catalogue. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 14 November 2026.