GHSA-fxc9-7j2w-vx54 — critical GitHub Advisory in rust/mpp

Description

Impact

Multiple vulnerabilities were discovered which allowed for undesirable behaviors, including:
- Performing free tempo/charge requests
- Replaying existing tempo/charge requests
- Performing free tempo/session requests
- Piggybacking off existing tempo/session channels
- Griefing existing tempo/session channels
- Manipulate the fee payer of a tempo/charge or tempo/session handler into paying for requests
- Replaying existing stripe/charge requests

Patches

The issues are patched in 0.8.0

Workarounds

There are no workarounds available for these vulnerabilities

Basic information

Type: reviewed
Severity: critical
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2026-03-29 15:20:45 UTC
Updated: 2026-04-01 09:10:43 UTC
GitHub reviewed: 2026-03-29 15:20:45 UTC

CVSS Scores

Base score	Version	Severity	Vector
9.3	4.0	—	`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` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:N) No additional preconditions are required beyond normal reachability. Privileges required (PR:N) No privileges are required. User interaction (UI:N) No user interaction is required. Vulnerable system confidentiality impact (VC:N) No confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:H) High integrity impact on the vulnerable system. Vulnerable system availability impact (VA:N) No availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:H) High confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:H) High integrity impact on subsequent systems. Subsequent system availability impact (SA:N) No availability impact on subsequent systems.

Identifiers

Type	Value
GHSA	GHSA-fxc9-7j2w-vx54 ↗

CWEs

CWE id	Name
CWE-288	Authentication Bypass Using an Alternate Path or Channel
CWE-294	Authentication Bypass by Capture-replay
CWE-345	Insufficient Verification of Data Authenticity

Credits

samczsun (finder)
veria-labs (finder)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
rust	mpp	< 0.8.0	0.8.0	—

mpp has multiple payment bypass and griefing vulnerabilities