CVE-2026-31835

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Source

https://cve.org/CVERecord?id=CVE-2026-31835

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31835.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-31835

Aliases

GHSA-x7g7-cgx5-jhx2

Published

2026-05-05T18:51:35Z

Modified

2026-08-12T03:51:33Z

Severity

5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator

Summary

Vaultwarden WebAuthn credential metadata tampered before signature verification

Details

Vaultwarden is a Bitwarden-compatible server written in Rust. In versions 1.35.4 and earlier, the WebAuthn authentication flow in validate_webauthn_login() updates persistent credential metadata (1backup_eligible1 and 1backup_state flags1) based on unverified authenticatorData before signature validation is performed. An attacker who knows a user's password but cannot produce a valid WebAuthn signature can permanently modify the stored backup flags for that user's credential. If signature verification fails, the database update is not rolled back. This can result in a persistent denial of service of WebAuthn two-factor authentication for affected credentials. This issue has been fixed in version 1.35.5.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-345"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31835.json"
}

References

Affected packages

Git / github.com/dani-garcia/vaultwarden

Affected ranges

Type

GIT

Repo

https://github.com/dani-garcia/vaultwarden

Events

Introduced

Fixed

39954af96aff8eb70eb4d26969abc1458bc4804f

Database specific

Show details

{
    "cpe": "cpe:2.3:a:dani-garcia:vaultwarden:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.35.5"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

0.*

0.10.0

0.11.0

0.12.0

0.13.0

1.*

1.0.0

1.1.0

1.10.0

1.11.0

1.12.0

1.13.0

1.13.1

1.14

1.14.1

1.14.2

1.15.0

1.15.1

1.16.0

1.16.1

1.16.2

1.16.3

1.17.0

1.18.0

1.19.0

1.2.0

1.20.0

1.21.0

1.22.0

1.22.1

1.22.2

1.23.0

1.23.1

1.24.0

1.25.0

1.25.1

1.25.2

1.26.0

1.27.0

1.28.0

1.28.1

1.29.0

1.29.1

1.29.2

1.3.0

1.30.0

1.30.1

1.30.2

1.30.3

1.30.4

1.30.5

1.31.0

1.32.0

1.32.1

1.32.2

1.32.3

1.32.4

1.32.5

1.32.6

1.32.7

1.33.0

1.33.1

1.33.2

1.34.0

1.34.1

1.34.2

1.34.3

1.35.0

1.35.1

1.35.2

1.35.3

1.35.4

1.4.0

1.5.0

1.6.0

1.6.1

1.7.0

1.8.0

1.9.0

1.9.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31835.json"