CVE-2026-47767
Symfony parsing flaw lets crafted query alter APP_ENV/APP_DEBUG via argv flags.
Is CVE-2026-47767 being exploited?
Not confirmed. CVE-2026-47767 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 0.72% probability of exploitation in the next 30 days.
How severe is CVE-2026-47767?
CVE-2026-47767 is rated High with a CVSS score of 8.3. 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-2026-47767?
Yes. A fix has been recorded for CVE-2026-47767. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-47767 affect?
CVE-2026-47767 affects Symfony < 5.4.52, Symfony < 6.4.40, Symfony < 7.4.12, Symfony < 8.0.12. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-47767?
Upgrade to 5.4.52, 6.4.40, 7.4.12, or 8.0.12; block suspicious query strings if you cannot patch.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can inject --env/--no-debug via query string to change APP_ENV/APP_DEBUG, enabling debug mode, info disclosure and increasing RCE risk.
Patch when possible
- affected>= 5.4.46 and < 5.4.52
- affected>= 6.4.14 and < 6.4.40
- affected>= 7.1.7 and < 7.4.12
- affected>= 8.0.0-BETA1 and < 8.0.12
- affected>= 5.4.46 and < 5.4.52
- affected>= 6.4.14 and < 6.4.40
- affected>= 7.1.7 and < 7.4.12
- affected>= 8.0.0-BETA1 and < 8.0.12
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.