PHP 8.5.12 Patch May Be Incomplete

Researchers warn PHP 8.5.12 security patch might not fully fix critical vulnerabilities.

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Oct 21, 2026

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PHP 8.5.12 Patch May Be Incomplete

Researchers warn PHP 8.5.12 security patch might not fully fix critical vulnerabilities.

In brief

Researchers warn PHP 8.5.12 security patch might not fully fix critical vulnerabilities. Elise Boyd reported a double-free crash in PHP 8.5.12 that does not prove remote exploitability of newly patched vulnerabilities. Originally reported by RuntimeWire.

Elise Boyd reports PHP crash

Elise Boyd reported a double-free crash in PHP 8.5.12 on October 21st.

“Elise Boyd reported a double-free crash in PHP 8.5.12 on October 21st”

Local CLI crash not remote exploit

Her Mastodon post shows a locally built PHP command-line binary aborting during proof-of-concept run.

Patch may not fully address issues

Patch may not fully address issues

The crash does not prove remote exploitability or show that PHP's two critical fixes failed.

The key point

Elise Boyd reported a double-free crash in PHP 8.5.12 that does not prove remote exploitability of newly patched vulnerabilities.

Read the original on RuntimeWire

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