Vulnerability · Published Jul 22, 2026 · Assigned by Caliptra

CVE-2026-7328Unverified AXI Address in Subsystem Mode Commands Enables Denial of Service

Medium 6.8

In plain English

A medium-severity missing authorization in Core Runtime Firmware from Caliptra. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 4.0)6.8Medium

Exploit odds (30 days)0.1%top 97.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Missing authorization in Caliptra Core Runtime Firmware (INVOKE_DPE_MLDSA87, CM_AES_GCM_DECRYPT_DMA, EXTERNAL_MAILBOX_CMD commands) in subsystem mode allows a privileged local attacker to cause a denial of service via mailbox commands containing unverified AXI addresses. The security impact beyond availability is integration-specific. This issue affects Core Runtime Firmware: 2.1.0.

Affected products (as reported)

Vendor	Product	Versions
Caliptra	Core Runtime Firmware	2.1.0

Weakness: CWE-862 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:L/SA:N

References

https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-c5v4-q445-wv84