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CVE-2026-114472— Insufficient Resource Pool in hMailServer

Quick assessment

Affected
Progressive Robot Ltd hMailServer
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.

Progressive Robot hMailServer 6.0.0 至 6.3.6 版本中，ACME HTTP-01 挑战响应器的资源池不足，允许远程未认证攻击者导致证书颁发或续期失败。当服务器通过 ACME 协议获取或更新 TLS 证书时，会在 80 端口运行 HTTP-01 挑战响应器，供证书颁发机构（CA）读取挑战令牌；该响应器一次仅处理一个连接：接受一个套接字、最多等待 5 秒接收请求、响应请求，之后才接受下一个连接。若某个客户端建立连接后不发送任何数据，便会独占该唯一工作线程直至超时。因此，在证书验证

CVSS 3.7 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
Progressive Robot Ltd hMailServer 6.0.0≤ 6.3.6 affected
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I. Basic Information for CVE-2026-114472

Vulnerability Information
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Vulnerability Title
Insufficient Resource Pool in hMailServer
Source: CVE Program / CVE List V5
Vulnerability Description
Insufficient resource pool in the ACME HTTP-01 challenge responder of Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a remote unauthenticated attacker to cause a certificate issuance or renewal to fail. When the server obtains or renews a TLS certificate over ACME it runs an HTTP-01 challenge responder on port 80 for the certificate authority to read the challenge token; the responder served one connection at a time, accepting a socket, waiting up to five seconds to receive a request, answering it, and only then accepting the next. A client that connected and sent nothing held the single worker for the whole timeout, so enough idle connections during a validation keep the certificate authority's own request from being answered in time and the validation fails. Sustained across a certificate's renewals this leads to the certificate expiring, after which clients refuse the server's TLS; the mail service itself continues on its current certificate until then. No authentication is required to connect to the responder. Version 6.3.7 serves up to 64 connections at once and closes a connection past that, so that where a handful of idle connections, one after another, sufficed before, a client must keep 64 idle connections open at once throughout a validation to have the certificate authority's connection closed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的资源池
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Progressive Robot Ltd hMailServer 6.0.0 ~ 6.3.6 -

II. Public POCs for CVE-2026-114472

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III. Intelligence Information for CVE-2026-114472

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Vendor Pages for CVE-2026-114472 (1)

Other References for CVE-2026-114472 (1)

Same Patch Batch · Progressive Robot Ltd · 2026-10-21 · 12 CVEs total

CVE-2026-114489 8.1 HIGH Missing Authorization in hMailServer
CVE-2026-114490 7.8 HIGH Incorrect Authorization in hMailServer
CVE-2026-114476 7.5 HIGH Incorrect Authorization in hMailServer
CVE-2026-114475 6.5 MEDIUM Missing Authorization in hMailServer
CVE-2026-114478 5.9 MEDIUM Unintended Proxy or Intermediary ('Confused Deputy') in hMailServer
CVE-2026-114474 5.9 MEDIUM Use of Less Trusted Source in hMailServer
CVE-2026-114479 5.8 MEDIUM Not Failing Securely ('Failing Open') in hMailServer
CVE-2026-114470 5.3 MEDIUM Cross-Site Request Forgery (CSRF) in hMailServer
CVE-2026-114473 5.0 MEDIUM Incorrect Authorization in hMailServer
CVE-2026-114471 4.7 MEDIUM Insertion of Sensitive Information into Log File in hMailServer
CVE-2026-114477 4.3 MEDIUM Missing Authorization in hMailServer

IV. Related Vulnerabilities

Same product: hMailServer
Same vendor: Progressive Robot Ltd
Same weakness: CWE-410

V. Comments for CVE-2026-114472

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