nimiq-blockchain: Genesis batch set request

CVE-2026-46543 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Impact

A remote peer can crash any full node by sending a RequestBatchSet message containing the genesis block's hash. The handler calls get_epoch_chunks which iterates backwards through macro blocks using Policy::macro_block_before. When it reaches the genesis block number, macro_block_before panics with "No macro blocks before genesis block".

Patches

The patch for this vulnerability is formally released as part of v1.5.0.

Workarounds

No Workaround, although requesting the genesis batch set is not used during normal operation.

Resources

See PR.

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-05-21 19:46:15 UTC
Updated
2026-06-10 13:41:39 UTC
GitHub reviewed
2026-05-21 19:46:15 UTC
NVD published
2026-06-09

EPSS Score

Score Percentile
0.04% 11.32%

CVSS Scores

Base score Version Severity Vector
5.3 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.

Identifiers

Type Value
GHSA GHSA-vghx-352f-93jm ↗
CVE CVE-2026-46543 ↗

CWEs

CWE id Name
CWE-617 Reachable Assertion

Credits

  • Piravlos (finder)

Affected packages (1)

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

Ecosystem Package Vulnerable range First patched Vulnerable functions
rust nimiq-blockchain < 1.5.0 1.5.0 —

References

cvelogic Threat Intelligence