CVE-2026-45756
Symfony JsonPath regex DoS via catastrophic backtracking causing CPU exhaustion
Is CVE-2026-45756 being exploited?
Not confirmed. CVE-2026-45756 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 0.63% probability of exploitation in the next 30 days.
How severe is CVE-2026-45756?
CVE-2026-45756 is rated High with a CVSS score of 8.2. 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-2026-45756?
Yes. A fix has been recorded for CVE-2026-45756. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-45756 affect?
CVE-2026-45756 affects Symfony JsonPath >=7.3.0-BETA1 and <7.4.12, Symfony JsonPath >=8.0.0 and <8.0.12, Web apps using Symfony JsonPath component. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-45756?
Upgrade to JsonPath 7.4.12 or 8.0.12; validate inputs and rate-limit requests.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker-supplied JsonPath filters compile into preg_match causing catastrophic backtracking, enabling remote CPU exhaustion and denial of service.
Patch when possible
- affected>= 7.3.0-BETA1 and < 7.4.12
- affected>= 8.0.0-BETA1 and < 8.0.12
- affected>= 7.3.0-BETA1 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.