# CVE-2026-4645: Github.com/antchfx/xpath: xpath: denial of service via crafted boolean xpath expressions

CVE-2026-4645 is fixed in golang-github-antchfx-xpath on 1 platform by DEBIAN-CVE-2026-4645 (version 1.3.6-1), released March 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-4645
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: n/a
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 23, 2026
- Weakness: Loop with Unreachable Exit Condition ('Infinite Loop')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4645

## Description

A flaw was found in the `github.com/antchfx/xpath` component. A remote attacker could exploit this vulnerability by submitting crafted Boolean XPath expressions that evaluate to true. This can cause an infinite loop in the `logicalQuery.Select` function, leading to 100% CPU utilization and a Denial of Service (DoS) condition for the affected system.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | golang-github-antchfx-xpath Debian 14 | 1.3.6-1 | [DEBIAN-CVE-2026-4645](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4645.md) | Mar 23, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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