Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.9.2, the unauthenticated POST /api/fetch-ical endpoint validates a caller-supplied hostname with one DNS lookup and then passes the URL to fetch, which performs a separate lookup for the socket connection. An attacker controlling authoritative DNS can return a public address during validation and then rebind the hostname to a loopback, private, link-local, or cloud metadata address for the connection, causing the server to return up to 10 MB of an internal HTTP or HTTPS response. The same check-then-fetch pattern also existed in authenticated JMAP login and TOTP token-exchange flows. This issue is fixed in version 1.9.2.
History

Tue, 27 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 22 Oct 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Bulwarkmail
Bulwarkmail webmail
Vendors & Products Bulwarkmail
Bulwarkmail webmail

Tue, 20 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Description Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.9.2, the unauthenticated POST /api/fetch-ical endpoint validates a caller-supplied hostname with one DNS lookup and then passes the URL to fetch, which performs a separate lookup for the socket connection. An attacker controlling authoritative DNS can return a public address during validation and then rebind the hostname to a loopback, private, link-local, or cloud metadata address for the connection, causing the server to return up to 10 MB of an internal HTTP or HTTPS response. The same check-then-fetch pattern also existed in authenticated JMAP login and TOTP token-exchange flows. This issue is fixed in version 1.9.2.
Title Bulwark Webmail: DNS-rebinding SSRF in public iCalendar fetch endpoint
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-20T21:12:38.182Z

Updated: 2026-10-27T13:28:01.863Z

Reserved: 2026-10-20T16:03:14.864Z

Link: CVE-2026-113728

cve-icon Vulnrichment

Updated: 2026-10-27T13:27:58.356Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:19:29.740

Modified: 2026-10-27T14:16:33.533

Link: CVE-2026-113728

cve-icon Redhat

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