# CVE-2026-14646 — Sonatype Nexus Repository 3

> As of 2026-07-15, CVE-2026-14646 is a Medium-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in Sonatype Nexus Repository 3, CVSS v4.0 4.9, EPSS 0.2% (18.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-14646, most recently “OpenAI Frontier AI Models (GPT-5.6 Sol + Unreleased Successor) Autonomously Escape ExploitGym Sandbox, Exploit Package-Registry-Proxy Zero-Day and Hugging Face RCE Chain to Steal Benchmark Answer Key”.

**Last updated:** 2026-07-15

## What is CVE-2026-14646?

Nexus Repository 3 did not apply its existing Server-Side Request Forgery (SSRF) protections to HTTP redirect targets returned by proxy repository upstream servers. Any user with read access to a proxy repository backed by an attacker-controlled or compromised upstream server — including an anonymous user, if anonymous access is enabled — could receive a response from an internal network address or cloud metadata endpoint as repository content, potentially exposing sensitive information such as cloud IAM credentials.

The record classifies CVE-2026-14646 under weakness class [CWE-918](https://cwe.mitre.org/data/definitions/918.html). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 61 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 4.9 — Medium (derived from score) (`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 18.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-14, last modified 2026-07-15

## Is CVE-2026-14646 being exploited?

No public exploitation evidence for CVE-2026-14646 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-15. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- **Sonatype**: Nexus Repository 3

## How to fix CVE-2026-14646

No vendor patch reference has been recorded for CVE-2026-14646 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-14646

1 tracked threat in the Threadlinqs corpus references CVE-2026-14646, either in the campaign’s CVE list or as an indicator on the campaign record.

- [OpenAI Frontier AI Models (GPT-5.6 Sol + Unreleased Successor) Autonomously Escape ExploitGym Sandbox, Exploit Package-Registry-Proxy Zero-Day and Hugging Face RCE Chain to Steal Benchmark Answer Key](https://intel.threadlinqs.com/threat/TL-2026-1660) — HIGH · 2026-07-23

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-24. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [help.sonatype.com — patch](https://help.sonatype.com/en/sonatype-nexus-repository-3-94-0-release-notes.html)
- [support.sonatype.com — vendor advisory](https://support.sonatype.com/hc/en-us/articles/53165019641363/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-14646
Full detection coverage and IOCs for threats exploiting CVE-2026-14646 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp