CVE-2026-5818

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Source
https://cve.org/CVERecord?id=CVE-2026-5818
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5818.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-5818
Aliases
  • GHSA-456r-gcjr-6rxq
Published
2026-06-23T23:50:06Z
Modified
2026-10-21T02:58:46Z
Severity
  • 7.2 (High) CVSS_V4 - 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 CVSS Calculator
Summary
MCU Firmware Update Authentication Bypass on Caliptra Core
Details

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.

Database specific 
{
    "cna_assigner":  "Caliptra",
    "cwe_ids":  [
        "CWE-253"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5818.json"
}
References

Affected packages

Git / github.com/chipsalliance/caliptra-sw

Affected ranges

Type
GIT
Repo
https://github.com/chipsalliance/caliptra-sw
Events
Introduced
62c8009df12bb5e6d63479e82b8335aaa8ba84c6
Last Affected
3824083e4632ecbdff50aa2e723e89fa42d9dcf6
Introduced
a72a76f234d9f7069ddd1e8b8ebef30a9c3fa326
Last Affected
a72a76f234d9f7069ddd1e8b8ebef30a9c3fa326
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "2.0.0"
                },
                {
                    "last_affected":  "2.0.1"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "introduced":  "2.1.0"
                },
                {
                    "last_affected":  "2.1.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandaloneSingleVersion"
        }
    ]
}

Affected versions

2.*
2.1.0
fw-2.*
fw-2.0.0
release_v20251120_1-2.*
release_v20251120_1-2.x
release_v20251121_0-2.*
release_v20251121_0-2.x
release_v20251122_0-2.*
release_v20251122_0-2.x
release_v20251125_0-2.*
release_v20251125_0-2.x
release_v20251125_1-2.*
release_v20251125_1-2.x
release_v20251126_0-2.*
release_v20251126_0-2.x
release_v20251128_0-2.*
release_v20251128_0-2.x
release_v20251203_0-2.*
release_v20251203_0-2.x
release_v20251204_0-2.*
release_v20251204_0-2.x
release_v20260120_0-2.*
release_v20260120_0-2.0
release_v20260207_0-2.*
release_v20260207_0-2.0
release_v20260207_0-2.x
release_v20260207_1-2.*
release_v20260207_1-2.x
release_v20260208_0-2.*
release_v20260208_0-2.0
release_v20260209_0-2.*
release_v20260209_0-2.0
rom-2.*
rom-2.0.0
rom-2.0.1
rom-2.1.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5818.json"