CVE-2026-33471 | nimiq core-rs-albatross up to 1.2.x SkipBlockProof::verify input validation (GHSA-6973-8887-87ff)

VDB-359059 · CVE-2026-33471 · GHSA-6973-8887-87FF NIMIQ CORE-RS-ALBATROSS UP TO 1.2.X SKIPBLOCKPROOF::VERIFY INPUT VALIDATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.4 $0-$5k 3.75+ Summaryinfo A vulnerability, which was classified as problematic, has been found in nimiq core-rs-albatross up to 1.2.x. This affects the function SkipBlockProof::verify. This manipulation causes input validation. The identification of this vulnerability is CVE-2026-33471. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component. Detailsinfo A vulnerability has been found in nimiq core-rs-albatross up to 1.2.x and classified as problematic. Affected by this vulnerability is the function SkipBlockProof::verify. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity, and availability. The summary by CVE is: nimiq/core-rs-albatross is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) for slot lookup. Prior to version 1.3.0, if an attacker can get a `SkipBlockProof` verified where `MultiSignature.signers` contains out-of-range indices spaced by 65536, these indices inflate `len()` but collide onto the same in-range `u16` slot during aggregation. This makes it possible for a malicious validator with far fewer than `2f+1` real signer slots to pass skip block proof verification by multiplying a single BLS signature by the same factor. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-33471 since 03/20/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 1.3.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch d02059053181ed8ddad6b59a0adfd661ef5cd823 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Vendor nimiq Name core-rs-albatross Version 1.0 1.1 1.2 License open-source Website Product: https://github.com/nimiq/core-rs-albatross/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.5 VulDB Meta Temp Score: 7.4 VulDB Base Score: 5.4 VulDB Temp Score: 5.2 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 9.6 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Input validation CWE: CWE-20 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: core-rs-albatross 1.3.0 Patch: d02059053181ed8ddad6b59a0adfd661ef5cd823 Timelineinfo 03/20/2026 CVE reserved 04/22/2026 +32 days Advisory disclosed 04/22/2026 +0 days VulDB entry created 04/22/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-6973-8887-87ff Status: Confirmed CVE: CVE-2026-33471 (🔒) GCVE (CVE): GCVE-0-2026-33471 GCVE (VulDB): GCVE-100-359059 Entryinfo Created: 04/22/2026 22:31 Changes: 04/22/2026 22:31 (67) Complete: 🔍 Cache ID: 99:42C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸