CVE-2026-42855

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Source

https://cve.org/CVERecord?id=CVE-2026-42855

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42855.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-42855

Aliases

GHSA-28hv-fwm3-rpcq

Published

2026-05-12T21:56:08.490Z

Modified

2026-07-15T01:48:52.440545872Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

Summary

arduino-esp32: Digest authentication URI mismatch bypass in WebServer allows cross-resource replay attack

Details

arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Prior to 3.3.8, the WebServer Digest authentication implementation in arduino-esp32 computes the authentication hash using the URI field from the client's Authorization header, without verifying that it matches the actual requested URI. This allows an attacker who possesses any valid digest response (computed for URI-A) to authenticate requests to a completely different protected URI (URI-B), bypassing per-resource access control. This vulnerability is fixed in 3.3.8.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42855.json",
    "cwe_ids": [
        "CWE-287"
    ],
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/espressif/arduino-esp32

Affected ranges

Type

GIT

Repo

https://github.com/espressif/arduino-esp32

Events

Introduced

Fixed

b4f85baa2d4a251eb435e0f78fcdda1fb193791f

Database specific

{
    "cpe": "cpe:2.3:a:espressif:arduino-esp32:*:-:*:*:*:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.3.8"
        }
    ]
}

Affected versions

1.*

1.0.0

1.0.0-RC0

1.0.0-rc1

1.0.0-rc2

1.0.0-rc3

1.0.0-rc4

1.0.1

1.0.1-rc1

1.0.1-rc2

1.0.1-rc3

1.0.1-rc4

1.0.2

1.0.2-rc1

1.0.2-rc2

1.0.3

1.0.3-rc1

1.0.3-rc2

1.0.3-rc3

1.0.4

1.0.4-rc1

1.0.5

1.0.5-rc1

1.0.5-rc2

1.0.5-rc3

1.0.5-rc4

1.0.5-rc5

1.0.5-rc6

1.0.5-rc7

1.0.6

2.*

2.0.0

2.0.0-alpha1

2.0.0-rc1

2.0.0-rc2

2.0.1

2.0.2

2.0.3

2.0.3-RC1

2.0.4

2.0.5

2.0.6

3.*

3.0.0

3.0.0-alpha1

3.0.0-alpha2

3.0.0-alpha3

3.0.0-rc1

3.0.0-rc2

3.0.0-rc3

3.0.1

3.0.2

3.0.3

3.0.4

3.0.5

3.1.1

3.1.2

3.1.3

3.2.0

3.2.0-RC1

3.2.0-RC2

3.2.1

3.3.0

3.3.1

3.3.2

3.3.3

3.3.4

3.3.5

3.3.6

3.3.6-RC1

3.3.7

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42855.json"