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TI-2026-28921 Aliases CVE-2026-40093GHSA-49xc-52mp-cc9j

nimiq-blockchain is missing a wall-clock upper bound on block timestamps

Priority LOW 35CWE-1284Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In 1.3.0 and earlier, block timestamp validation enforces that timestamp >= parent.timestamp for non-skip blocks and timestamp == parent.timestamp + MIN_PRODUCER_TIMEOUT for skip blocks, but there is no visible upper bound check against the wall clock. A malicious block-producing validator can set block timestamps arbitrarily far in the future. This directly affects reward calculations via Policy::supply_at() and batch_delay() in blockchain/src/reward.rs, inflating the monetary supply beyond the intended emission schedule.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00326 25th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nimiqcore-rs-albatrossup to 1.3.0—No fix listedCNA
—nimiq-blockchain (crates.io)up to 1.3.0—No fix listedGHSA-49xc-52mp-cc9j
  • core-rs-albatross Vendornimiq Affected up to 1.3.0 Fixed in — No fix listed CNA
  • nimiq-blockchain (crates.io) Vendor— Affected up to 1.3.0 Fixed in — No fix listed GHSA-49xc-52mp-cc9j

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*before 1.3.0Vulnerablenimiq
  • cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:* Versions before 1.3.0 Vulnerable ·nimiq

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40093
  2. 2026-10-03 Alias added: GHSA-49xc-52mp-cc9j

References

Advisory 1

Other 2

  • TI-2026-26389 nimiq-account: Vesting insufficient funds error can panic CVSS 3.1HIGH 8.2
  • TI-2026-25867 nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation CVSS 3.1CRITICAL 9.6
  • TI-2026-27598 nimiq/core-rs-albatross: Panic in history index request handlers when a full node runs without the history index CVSS 3.1HIGH 7.5
  • TI-2026-26390 nimiq-primitives: Node crash due to missing interlink validation in election macro block proposals CVSS 3.1HIGH 7.5
  • TI-2026-26388 network-libp2p: Peer can crash the node by opening discovery protocol substream twice CVSS 3.1HIGH 7.5
  • TI-2026-25612 nimiq/core-rs-albatross: Discovery handshake limit could underflow and later provoke a deterministic overflow panic CVSS 3.1HIGH 7.5
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences