CVE-2026-48824

Mailpit versions before 1.30.1 expose a pre-auth memory-exhaustion DoS via unbounded JSON bodies on four endpoints: PUT /api/v1/messages, DELETE /api/v1/messages, PUT /api/v1/tags, and POST /api/v1/message/{id}/release. The root cause is json.NewDecoder(r.Body) used without a body-size cap, unlik...

CVE-2026-45709

Mailpit’s CVE-2026-45709 vulnerability stems from an incomplete fix for GHSA-6jxm. While v1.28.3 hardened CSS download with size cap, content-type check, and login-info stripping, the internal htmlcheck CSS downloader (internal/htmlcheck/css.go) did not implement an IP-filtering dialer. The safeD...

CVE-2026-45711

CVE-2026-45711 (Mailpit) describes a path traversal and arbitrary file write in the mailpit dump --http workflow. The vulnerability arises when Mailpit downloads messages from a remote server and constructs the output file path using the message ID from the JSON response via path.Join; the functi...

CVE-2026-23845

Mailpit (github.com/axllent/mailpit) is affected by SSRF via the HTML Check API. The HTMLCheck flow processes HTML emails by inlining external CSS files through inlineRemoteCSS(), which fetches URLs found in tags. Root cause: insufficient URL validation and unrestricted external fetching in isUR...

CVE-2026-45712

CVE-2026-45712 concerns Mailpit's proxy CSS rewriter exposing a race condition: an unsynchronized read of a package-level assets map occurs concurrently with writes under the assetsMutex, causing a runtime panic (concurrent map read and map write) and a full Mailpit process crash, taking SMTP/POP...

CVE-2026-45713

Mailpit suffers an unauthenticated remote memory-exhaustion DoS due to missing limits on SMTP DATA and the /api/v1/send body. Before v1.30.0, Server.MaxSize is not assigned, allowing unbounded data growth and RAM/disk pressure as messages are processed and stored. Multiple sources (CVE-2026-45713...

CVE-2026-21859

Mailpit is vulnerable to Server-Side Request Forgery (SSRF) in the /proxy endpoint for versions 1.28.0 and earlier. The endpoint validates http:// and https:// but does not block internal IPs, enabling an attacker to access internal resources via crafted HTTP GET requests with minimal headers. Th...

CVE-2026-23829

CVE-2026-23829 — Mailpit SMTP header injection via regex bypass. Mailpit’s SMTP server (prior to v1.28.3) fails to properly filter control characters in RCPT TO/MAIL FROM addresses due to a regex with an incomplete character class, allowing CR/LF bypass and header injection. The flaw stems from G...

CVE-2026-27808

CVE-2026-27808 affects Mailpit’s Link Check API (/api/v1/message/{ID}/link-check). Prior to v1.29.2, the server performs HTTP HEAD requests on all URLs found in emails without validating target hosts or filtering private/internal IP ranges, enabling remote SSRF with no authentication. The vulnera...

CVE-2026-22689

Mailpit prior to v1.28.2 is vulnerable to Cross-Site WebSocket Hijacking (CSWSH) because the WebSocket upgrader accepts connections from any origin (CheckOrigin always true). This enables a malicious site to create a WebSocket to ws://localhost:8025 and receive real-time data such as email conten...