CVE-2026-5818
Last modified
CVE-2026-5818 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. Incorrect check of function return value in Caliptra Core Runtime Firmware (ActivateFirmwareCmd::activate_fw modules) allows bypass of Caliptra Core's verification of the MCU FW during a hitless update. This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.. EPSS estimates a 0.15% chance of exploitation in the next 30 days.
Description
Incorrect check of function return value in Caliptra Core Runtime Firmware (ActivateFirmwareCmd::activate_fw modules) allows bypass of Caliptra Core's verification of the MCU FW during a hitless update. This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.
Metrics
CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Caliptra | Core Runtime Firmware | >= 2.0.0, <= 2.0.1; 2.1.0 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-5818?
How severe is CVE-2026-5818?
How do I fix CVE-2026-5818?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-58174Hermes WebUI before 0.51.521 validates the workspace of an i…6.5
- CVE-2026-58175Apache Traffic Server leaks memory when handling HostDB SRV …8.2
- CVE-2026-58176RuoYi-Vue-Plus through 5.6.2, fixed in commit 88d03d9, expos…7.1
- CVE-2026-58177The Apache Traffic Server Cripts framework has out-of-bounds…9.8
- CVE-2026-58178The Apache Traffic Server ESI plugin can recurse without bou…8.2
- CVE-2026-58179The Apache Traffic Server regex_remap plugin overflows the s…9.8
- CVE-2026-58180The Apache Traffic Server txn_box plugin overflows the stack…8.2
- CVE-2026-58181The Apache Traffic Server uri_signing and url_sig plugins ca…8.2
- CVE-2026-58182The Apache Traffic Server ts_lua plugin mishandles initializ…8.6
- CVE-2026-58183The Apache Traffic Server prefetch plugin can crash when pro…7.5
- CVE-2026-58184The Apache Traffic Server header_rewrite plugin can crash or…7.5
- CVE-2026-58185The Apache Traffic Server intercept plugin has a use-after-f…9.8
Are you affected by CVE-2026-5818?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST