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CVE-2026-48824— Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounded JSON body on /api/v1/messages, /api/v1/tags, and /api/v1/message/{id}/release (incomplete fix of GHSA-fpxj-m5q8-fphw)

Quick assessment

Affected
axllent mailpit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

axllent mailpit是axllent个人开发者开源的一款邮件测试与调试工具。 Ralph Slooten Mailpit 1.30.1之前版本存在资源管理错误漏洞，该漏洞源于对JSON-body API端点设置不当的body-size限制，可能导致未经身份验证的远程攻击者通过发送大量元素造成拒绝服务。

CVSS 5.3 · Medium EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
axllent mailpit < 1.30.1 affected
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I. Basic Information for CVE-2026-48824

Vulnerability Information
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Vulnerability Title
Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounded JSON body on /api/v1/messages, /api/v1/tags, and /api/v1/message/{id}/release (incomplete fix of GHSA-fpxj-m5q8-fphw)
Source: CVE Program / CVE List V5
Vulnerability Description
Mailpit is an email testing tool and API for developers. Prior to version 1.30.1, the fix for GHSA-fpxj-m5q8-fphw (CVE-2026-45710, "Mailpit: Set a default 50MB p/m limit to prevent DoS via unlimited SMTP DATA and /api/v1/send body sizes") wrapped only `POST /api/v1/send` with `http.MaxBytesReader`. The four other Mailpit JSON-body API endpoints `PUT /api/v1/messages` (SetReadStatus), `DELETE /api/v1/messages` (DeleteMessages), `PUT /api/v1/tags` (SetMessageTags), and `POST /api/v1/message/{id}/release` (ReleaseMessage) still call `json.NewDecoder(r.Body)` directly with no body-size cap and remain reachable unauthenticated in the default `docker run axllent/mailpit:latest` deploy. An unauthenticated remote attacker can post a multi-million-element `IDs` slice and drive RSS from ~25 MiB baseline to ~450 MiB per 16 MB request body. Repeating across multiple connections accumulates the same per-request amplification per process. Version 1.30.1 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Ralph Slooten Mailpit 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
axllent mailpit是axllent个人开发者开源的一款邮件测试与调试工具。 Ralph Slooten Mailpit 1.30.1之前版本存在资源管理错误漏洞，该漏洞源于对JSON-body API端点设置不当的body-size限制，可能导致未经身份验证的远程攻击者通过发送大量元素造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
axllent mailpit < 1.30.1 -

II. Public POCs for CVE-2026-48824

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III. Intelligence Information for CVE-2026-48824

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Vendor Advisories for CVE-2026-48824 (1)

Vendor Pages for CVE-2026-48824 (1)

Same Patch Batch · axllent · 2026-07-20 · 5 CVEs total

CVE-2026-45713 7.5 HIGH Mailpit: Unauthenticated remote memory-exhaustion DoS via unlimited SMTP DATA and /api/v1/
CVE-2026-45712 5.9 MEDIUM Mailpit: Concurrent map read & write in proxy CSS rewriter - remote unauth crash (fatal er
CVE-2026-45711 5.9 MEDIUM Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-control
CVE-2026-45709 5.8 MEDIUM Mailpit has an incomplete fix for GHSA-6jxm: HTML check still permits SSRF to private/loop

IV. Related Vulnerabilities

Same product: mailpit
Same vendor: axllent
Same weakness: CWE-770

V. Comments for CVE-2026-48824

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