# GCHQ vulnerabilities

Source: https://junglewise.ai/threats/vendors/gchq  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/gchq.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in GCHQ: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-57439, was published on 8 July 2026. 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 3 (0 critical, 0 exploited in the wild)

## About GCHQ

Government Communications Headquarters is an intelligence and security organisation responsible for providing signals intelligence and information assurance to the government and armed forces of the United Kingdom.

## Latest GCHQ vulnerabilities

- [CVE-2026-57439: GCHQ CyberChef prototype pollution in Series Chart operation](https://junglewise.ai/threats/cve-2026-57439-gchq-cyberchef-prototype-pollution-in-series-chart-operation) (medium, CVSS 5, published 8 Jul 2026)
- [CVE-2026-42615: GCHQ CyberChef XSS in Show Base64 offsets operation](https://junglewise.ai/threats/cve-2026-42615-gchq-cyberchef-xss-in-show-base64-offsets-operation) (high, CVSS 7.2, published 29 Apr 2026)
- [CVE-2019-15532: CyberChef cross-site scripting in Text Encoding Brute Force](https://junglewise.ai/threats/cve-2019-15532-cyberchef-cross-site-scripting-in-text-encoding-brute-force) (low, CVSS 3, published 27 Aug 2019)

## Most severe GCHQ vulnerabilities

- [CVE-2026-42615: GCHQ CyberChef XSS in Show Base64 offsets operation](https://junglewise.ai/threats/cve-2026-42615-gchq-cyberchef-xss-in-show-base64-offsets-operation) (high, CVSS 7.2, published 29 Apr 2026)
- [CVE-2026-57439: GCHQ CyberChef prototype pollution in Series Chart operation](https://junglewise.ai/threats/cve-2026-57439-gchq-cyberchef-prototype-pollution-in-series-chart-operation) (medium, CVSS 5, published 8 Jul 2026)
- [CVE-2019-15532: CyberChef cross-site scripting in Text Encoding Brute Force](https://junglewise.ai/threats/cve-2019-15532-cyberchef-cross-site-scripting-in-text-encoding-brute-force) (low, CVSS 3, published 27 Aug 2019)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## GCHQ technologies

- [GCHQ CyberChef](https://junglewise.ai/threats/technologies/cyberchef): 3 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "GCHQ vulnerabilities", https://junglewise.ai/threats/vendors/gchq, 9 November 2026.