CVE-2026-73136

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Source

https://cve.org/CVERecord?id=CVE-2026-73136

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73136.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-73136

Aliases

EEF-CVE-2026-73136
GHSA-34g7-vx6g-82mq

Published

2026-08-19T17:19:52Z

Modified

2026-08-22T03:31:06Z

Severity

8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Static memo configuration in mpp Tempo disables per-challenge attribution binding, enabling third-party replay

Details

Authentication Bypass by Capture-replay in ZenHive mpp allows an unauthenticated third party to obtain paid resources by replaying a transfer settled by an unrelated payer.

MPP.Methods.Tempo normally binds a settled TIP-20 TransferWithMemo to the specific challenge under verification through an attribution nonce carried in the memo. When a static "memo" is configured in method_config, check_matched_memo_binding/3 returns the match unconditionally and that binding is skipped, leaving only token, recipient, amount and the static memo value to match on. The static memo is echoed in every unauthenticated 402 response and Tempo transfers are public, so an attacker can take any matching transfer paid by a legitimate customer, request a fresh challenge for the same route, and present that transaction hash as a type="hash" credential. The hash path performs no sender or signature check tying the presenter to the wallet that broadcast the transfer.

This issue affects mpp: from 0.6.1 before 0.6.4.

Database specific

{
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-294"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73136.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "542a525563c2fcedd670b593437deca81c6797a4"
                },
                {
                    "fixed": "2207d7f456ae14c1d3fcacc6f635bf4f8cee1a34"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}

References

Affected packages

Git / github.com/zenhive/mpp

Affected ranges

Type

GIT

Repo

https://github.com/zenhive/mpp

Events

Introduced

542a525563c2fcedd670b593437deca81c6797a4

Fixed

80932c5174ad7cedbb92ceba1873bda57c546337

Fixed

2207d7f456ae14c1d3fcacc6f635bf4f8cee1a34

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0.6.1"
        },
        {
            "fixed": "0.6.4"
        }
    ],
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

v0.*

v0.6.1

v0.6.3

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73136.json"