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nimiq-libp2p request/response codec reads entire stream before size validation

Moderate
jsdanielh published GHSA-gh7r-qh4p-q4fr Apr 22, 2026

Package

cargo network-libp2p (Rust)

Affected versions

<=v1.2.2

Patched versions

v1.3.0

Description

Impact

MessageCodec::read_request and read_response call read_to_end() on inbound substreams, so a remote peer can send only a partial frame and keep the substream open. because Behaviour::new also sets with_max_concurrent_streams(1000), the node exposes a much larger stalled-slot budget than the library default.

Patches

The patch for this vulnerability is formally released as part of v1.3.0.

Workarounds

No known workarounds.

References

See PR.

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVE ID

CVE-2026-34062

Weaknesses

Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. Learn more on MITRE.

Credits