CVE-2026-11835

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Source
https://cve.org/CVERecord?id=CVE-2026-11835
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11835.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-11835
Aliases
  • GHSA-49mm-5gq5-v97f
Published
2026-08-04T00:03:23.278Z
Modified
2026-08-07T11:48:51.667703935Z
Severity
  • 5.7 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Caliptra Update-Reset Secure-Boot Bypass via Attacker-Chosen AXI Staging Address (TOCTOU)
Details

Time-of-check time-of-use (TOCTOU) vulnerability combined with missing input validation in Caliptra Core ROM (UpdateResetFlow::run()) in subsystem mode allows a compromised local attacker to silently bypass secure boot by supplying an AXI staging address that is not validated against the strap-configured SSEXTERNALSTAGINGAREABASE_ADDR, enabling firmware to be modified between verification and loading into ICCM. Attestation continues to report the originally verified image digest, masking the compromise. Exploitation requires a compromised MCU firmware with AXI manager access to unprotected SRAM reachable by Caliptra.

This issue affects Core ROM: 2.1.0 through 2.1.1.

Database specific 
{
    "cwe_ids": [
        "CWE-20",
        "CWE-367"
    ],
    "cna_assigner": "Caliptra",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11835.json"
}
References

Affected packages

Git / github.com/chipsalliance/caliptra-sw

Affected ranges

Type
GIT
Repo
https://github.com/chipsalliance/caliptra-sw
Events
Introduced
a72a76f234d9f7069ddd1e8b8ebef30a9c3fa326
Fixed
510a23adbc911e8e72708799daba964ec045ef25
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ],
    "extracted_events": [
        {
            "introduced": "2.1.0"
        },
        {
            "last_affected": "2.1.1"
        },
        {
            "fixed": "2.1.1"
        }
    ]
}

Affected versions

fw-2.*
fw-2.1.0
release_v20260207_0-2.*
release_v20260207_0-2.x
release_v20260207_1-2.*
release_v20260207_1-2.x
release_v20260214_0-2.*
release_v20260214_0-2.x
release_v20260217_0-2.*
release_v20260217_0-2.x
release_v20260218_0-2.*
release_v20260218_0-2.x
release_v20260310_0-2.*
release_v20260310_0-2.x
release_v20260310_1-2.*
release_v20260310_1-2.x
release_v20260312_0-2.*
release_v20260312_0-2.x
release_v20260317_0-2.*
release_v20260317_0-2.x
release_v20260319_0-2.*
release_v20260319_0-2.x
rom-2.*
rom-2.1.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11835.json"