🛡️ GHSA-8x4m-qw58-3pcx — mppx

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-288 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

mppx has multiple payment bypass and griefing vulnerabilities

Impact

Multiple vulnerabilities were discovered in tempo/charge and tempo/session which allowed for undesirable behaviors, including:

  • Replaying tempo/charge transaction hashes across push/pull modes, across charge/session endpoints, and via concurrent requests
  • Performing free tempo/charge requests due to missing transfer log verification in pull-mode
  • Replaying tempo/charge credentials across routes via cross-route scope confusion (memo/splits not included in scope binding)
  • Manipulating the fee payer of a tempo/charge handler into paying for requests (missing sender signature before co-signing)
  • Bypassing tempo/session voucher signature verification
  • Piggybacking off existing tempo/session channels via settle voucher reuse and weak channel ID binding
  • Performing free tempo/session requests by exploiting channel reopen without on-chain settled state
  • Accepting deductions on finalized tempo/session channels
  • Bypassing payment on free routes via method-mismatch fallback
  • Griefing tempo/session channels via force-close detection bypass (closeRequestedAt not persisted)

Patches

Fixed in 0.4.8.

Workarounds

There are no workarounds available for these vulnerabilities.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity high, availability none.

Weakness class

GHSA-8x4m-qw58-3pcx is classified as CWE-288: Authentication Bypass Using an Alternate Path. A secondary route into the application skips the authentication that the primary route enforces.

Affected software

GHSA-8x4m-qw58-3pcx is recorded against 1 package.

  • mppx

Timeline and source

Published on 29 March 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N
CWE CWE-288
Public Exploit ✅ No
Source OSV
Published 2026-03-29
Updated 2026-08-20
Modified 2026-03-29
Fix URL N/A

Affected Packages

Software From version Fixed in
mppx — —

Similar Threats

Exploit Protection

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GHSA-8x4m-qw58-3pcx carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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