PT-2026-27134 · Antchfx · Xpath

Athuljayaram · Published 2026-01-01 · Updated 2026-04-08 · CVE-2026-4645

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions github.com/antchfx/xpath (affected versions not specified)

Description A flaw exists in the github.com/antchfx/xpath component that allows a remote attacker to cause a Denial of Service (DoS) condition. This is achieved by submitting crafted Boolean XPath expressions that evaluate to true, triggering an infinite loop within the logicalQuery.Select function. This results in 100% CPU utilization, impacting the affected system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

CVE-2026-4645

Affected Products

Xpath

References · 13

• https://ubuntu.com/security/CVE-2026-4645 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-4645 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-4645 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-4645 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4645 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-4645 · Vendor Advisory
• https://github.com/antchfx/xpath/issues/121 · Note
• https://github.com/antchfx/xpath/commit/afd4762cc342af56345a3fb4002a59281fcab494 · Note
• https://github.com/golang/vulndb/issues/4526 · Note
• https://twitter.com/cyberbivash/status/2036114670218567963 · Twitter Post
• https://t.me/msrcreports/3749 · Telegram Post
• https://access.redhat.com/security/cve/CVE-2026-4645 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2450214 · Note