# Http4k-Core vulnerabilities

Source: https://junglewise.ai/threats/technologies/http4k-core  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/http4k-core.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 6 vulnerabilities in Http4k-Core: 0 in the last 7 days and 3 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-100725, was published on 27 September 2026. Nothing in the last four weeks, down from 3 vulnerabilities in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 3
- All time: 6 (0 critical, 0 exploited in the wild)

## About Http4k-Core

Kotlin HTTP server library with support for routing, middleware, and request/response handling.

## Latest Http4k-Core vulnerabilities

- [CVE-2026-100725: http4k cookie storage domain scoping bypass](https://junglewise.ai/threats/cve-2026-100725-http4k-maven-artifact-org-http4k-http4k-core-before-6-48-0-0-5) (medium, CVSS 6.5, published 27 Sep 2026)
- [CVE-2026-100724: http4k reverse proxy host header substring matching bypass](https://junglewise.ai/threats/cve-2026-100724-http4k-maven-package-org-http4k-http4k-core-before-6-49-0-0-5-42) (medium, CVSS 5.4, published 27 Sep 2026)
- [CVE-2026-53659: http4k unbounded gzip decompression denial of service](https://junglewise.ai/threats/cve-2026-53659-http4k-unbounded-gzip-decompression-denial-of-service) (high, CVSS 7.5, published 14 Sep 2026)
- [http4k information exposure via improper cookie scoping in BasicCookieStorage](https://junglewise.ai/threats/http4k-information-exposure-via-improper-cookie-scoping-in-24a5c491) (medium, CVSS 6.9, published 19 Jun 2026)
- [http4k misleading HmacSha256.hash naming leads to unkeyed digest usage](https://junglewise.ai/threats/http4k-misleading-hmacsha256-hash-naming-leads-to-unkeyed-digest-usage-d5026b8c) (high, CVSS 8.2, published 19 Jun 2026)
- [http4k auth bypass via loose Host matching in reverseProxy](https://junglewise.ai/threats/http4k-auth-bypass-via-loose-host-matching-in-reverseproxy-bcd046a3) (medium, CVSS 6.3, published 19 Jun 2026)

## Most severe Http4k-Core vulnerabilities

- [http4k misleading HmacSha256.hash naming leads to unkeyed digest usage](https://junglewise.ai/threats/http4k-misleading-hmacsha256-hash-naming-leads-to-unkeyed-digest-usage-d5026b8c) (high, CVSS 8.2, published 19 Jun 2026)
- [CVE-2026-53659: http4k unbounded gzip decompression denial of service](https://junglewise.ai/threats/cve-2026-53659-http4k-unbounded-gzip-decompression-denial-of-service) (high, CVSS 7.5, published 14 Sep 2026)
- [http4k information exposure via improper cookie scoping in BasicCookieStorage](https://junglewise.ai/threats/http4k-information-exposure-via-improper-cookie-scoping-in-24a5c491) (medium, CVSS 6.9, published 19 Jun 2026)
- [CVE-2026-100725: http4k cookie storage domain scoping bypass](https://junglewise.ai/threats/cve-2026-100725-http4k-maven-artifact-org-http4k-http4k-core-before-6-48-0-0-5) (medium, CVSS 6.5, published 27 Sep 2026)
- [http4k auth bypass via loose Host matching in reverseProxy](https://junglewise.ai/threats/http4k-auth-bypass-via-loose-host-matching-in-reverseproxy-bcd046a3) (medium, CVSS 6.3, published 19 Jun 2026)
- [CVE-2026-100724: http4k reverse proxy host header substring matching bypass](https://junglewise.ai/threats/cve-2026-100724-http4k-maven-package-org-http4k-http4k-core-before-6-49-0-0-5-42) (medium, CVSS 5.4, published 27 Sep 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 3 vulnerabilities in the four before.

| 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 | 1 | 0 | 0 |
| 21 Sep 2026 | 2 | 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 |

## Other Http4k technologies

- [Http4k-Security-Digest](https://junglewise.ai/threats/technologies/http4k-security-digest): 4 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, "Http4k-Core vulnerabilities", https://junglewise.ai/threats/technologies/http4k-core, 9 November 2026.