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CVE-2026-72757— Routinator HTTP server becomes unavailable with many unclosed connections

Quick assessment

Affected
NLnet Labs Routinator
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.

当大量连接被建立却从未关闭时，Routinator 的 HTTP 服务器会耗尽可用的连接资源，导致该服务器不可用。攻击者可通过向 HTTP 服务器发起大量连接来恶意触发此状况。 此问题仅影响将 HTTP 或 RTR 服务器暴露给不可信网络的用户。

CVSS 5.3 · Medium EPSS 0.36% · P30

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
NLnet Labs Routinator 0.15.3< * unaffected
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I. Basic Information for CVE-2026-72757

Vulnerability Information
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Vulnerability Title
Routinator HTTP server becomes unavailable with many unclosed connections
Source: CVE Program / CVE List V5
Vulnerability Description
Routinator runs out of open connections on the HTTP server when many connections are opened but never closed, leaving the HTTP server unavailable. This condition can be triggered maliciously by an attacker by opening a large number of connections to the HTTP server. This only affects users that make their HTTP or RTR server available to untrusted networks.
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
对异常条件的处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
NLnet Labs Routinator 0.15.3 ~ * -

II. Public POCs for CVE-2026-72757

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-72757

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Vendor Advisories for CVE-2026-72757 (1)

Same Patch Batch · NLnet Labs · 2026-10-26 · 7 CVEs total

CVE-2026-72753 8.2 HIGH Routinator incorrectly handles delta updates
CVE-2026-72756 7.5 HIGH Routinator exits on malformed rsync URIs
CVE-2026-72754 7.5 HIGH Routinator exits when parsing an incorrect or very large CRL file
CVE-2026-72758 7.5 HIGH Routinator may exit on malformed ranges
CVE-2026-72752 6.5 MEDIUM Routinator exits when requesting the output repeatedly
CVE-2026-72755 3.8 LOW Routinator stores TA certificate in cache without validation

IV. Related Vulnerabilities

Same product: Routinator
Same vendor: NLnet Labs
Same weakness: CWE-755