CVE-2026-13507 Overview
CVE-2026-13507 is a low-severity vulnerability in volcengine OpenViking versions up to 0.3.21. The flaw exists in the str_to_uint64 function located in openviking/storage/vectordb/utils/str_to_uint64.py, part of the Local VectorDB Primary-key Label Handler component. Manipulation of the ID argument results in insufficient verification of data authenticity [CWE-345]. The issue is exploitable remotely, but successful attacks require high complexity and low-privilege access. A pull request addressing the flaw is pending acceptance at the time of publication.
Critical Impact
Attackers with low-level privileges can remotely manipulate primary-key label handling in the local vector database, compromising the authenticity of stored records with limited impact to confidentiality, integrity, and availability.
Affected Products
- volcengine OpenViking versions up to and including 0.3.21
- Component: Local VectorDB Primary-key Label Handler
- File: openviking/storage/vectordb/utils/str_to_uint64.py
Discovery Timeline
- 2026-06-28 - CVE-2026-13507 published to NVD
- 2026-06-29 - Last updated in NVD database
Technical Details for CVE-2026-13507
Vulnerability Analysis
The vulnerability resides in the str_to_uint64 utility function within OpenViking's vector database storage module. This function converts string identifiers into unsigned 64-bit integer values used as primary-key labels within the local vector database. The conversion process fails to sufficiently verify the authenticity of input data supplied through the ID argument.
Because primary-key labels drive record identity within the vector database, an attacker who can influence the ID value can produce label collisions or forged identifiers. The flaw is classified under [CWE-345] Insufficient Verification of Data Authenticity. Exploitation is remote but described as highly complex, requiring specific preconditions to achieve a measurable impact.
Root Cause
The root cause is the absence of authenticity checks on the string-to-integer transformation performed by str_to_uint64. The function trusts caller-supplied identifiers without validating provenance or ensuring uniqueness at the label layer. When two distinct source strings map to the same or predictable 64-bit output, record integrity within the vector database can be undermined.
Attack Vector
The attack vector is network-based. An authenticated attacker with low privileges submits crafted ID values through interfaces that invoke the str_to_uint64 function. Successful exploitation requires overcoming high attack complexity, which reduces the practical exploitability of this issue. The vulnerability manifests entirely within the primary-key label handling path of the local vector database and does not produce cross-component or subsequent-system impact. Refer to the GitHub OpenViking Issue #2263 for the reported technical details.
Detection Methods for CVE-2026-13507
Indicators of Compromise
- Unexpected duplicate primary-key labels within the OpenViking local vector database
- Anomalous input patterns targeting endpoints that invoke str_to_uint64
- Record integrity mismatches between source identifiers and stored uint64 labels
Detection Strategies
- Audit calls into openviking/storage/vectordb/utils/str_to_uint64.py and log all ID argument values passed to the function
- Correlate string identifiers with their resulting uint64 labels to detect collisions or forged mappings
- Review vector database writes for records sharing identical primary-key labels but originating from distinct sources
Monitoring Recommendations
- Enable verbose logging on the Local VectorDB Primary-key Label Handler component during triage
- Monitor authentication logs for low-privilege accounts issuing repeated ID-manipulation requests
- Track integrity metrics on vector database primary-key uniqueness and alert on divergence
How to Mitigate CVE-2026-13507
Immediate Actions Required
- Inventory all deployments running volcengine OpenViking at version 0.3.21 or earlier
- Restrict network access to OpenViking interfaces so only trusted, authenticated clients can invoke label-handling operations
- Review and tighten privileges of accounts that can submit ID values to the vector database
Patch Information
A fix has been proposed in GitHub OpenViking Pull Request #2268, which is pending acceptance at the time of publication. Administrators should track the GitHub OpenViking Repository for merge status and apply the update once released. Additional context is available in the VulDB CVE-2026-13507 entry.
Workarounds
- Enforce strict input validation on any ID values before they reach str_to_uint64
- Add a wrapper that verifies uniqueness of generated uint64 labels prior to insertion
- Limit exposure of the Local VectorDB Primary-key Label Handler to internal, authenticated services only
# Restrict access to OpenViking service to trusted internal subnets
# Example iptables rule (adapt to your environment)
iptables -A INPUT -p tcp --dport <openviking-port> -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport <openviking-port> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
