CVE-2026-34872
Critical RCE in Mbed TLS/TF-PSA-Crypto due to improper FFDH input validation.
Is CVE-2026-34872 being exploited?
Not confirmed. CVE-2026-34872 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 0.20% probability of exploitation in the next 30 days.
How severe is CVE-2026-34872?
CVE-2026-34872 is rated Critical with a CVSS score of 9.1. 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-2026-34872?
Yes. A fix has been recorded for CVE-2026-34872. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-34872 affect?
CVE-2026-34872 affects Mbed TLS 3.5.x, Mbed TLS 3.6.x (up to 3.6.5), TF-PSA-Crypto 1.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-34872?
Upgrade to fixed versions; apply vendor patches promptly.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Peer/MITM can force DH shared secret into a small set via FFDH, enabling remote code execution or protocol abuse.
Patch when possible