Widely used PHP runtime; use-after-free leads to RCE via SOAP; could disrupt many servers.
CVE-2026-6722
PHP SOAP use-after-free enables remote code execution via crafted SOAP requests.
Is CVE-2026-6722 being exploited?
Not confirmed. CVE-2026-6722 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.89% probability of exploitation in the next 30 days.
How severe is CVE-2026-6722?
CVE-2026-6722 is rated Critical with a CVSS score of 9.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-6722?
Yes. A fix has been recorded for CVE-2026-6722. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-6722 affect?
CVE-2026-6722 affects PHP 8.2.x < 8.2.31, PHP 8.3.x < 8.3.31, PHP 8.4.x < 8.4.21, PHP 8.5.x < 8.5.6. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-6722?
Upgrade to fixed releases (8.2.31+, 8.3.31+, 8.4.21+, 8.5.6+).
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on affected servers via malicious SOAP requests.
Patch immediately
- affected>= 8.2.* and < 8.2.31
- affected>= 8.3.* and < 8.3.31
- affected>= 8.4.* and < 8.4.21
- affected>= 8.5.* and < 8.5.6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.