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CVE-2026-40280— Gotenberg SSRF via case-insensitive URL scheme bypass in webhook and downloadFrom deny-lists

EPSS 0.03% · P9
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I. Basic Information for CVE-2026-40280

Vulnerability Information
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Vulnerability Title
Gotenberg SSRF via case-insensitive URL scheme bypass in webhook and downloadFrom deny-lists
Source: NVD (National Vulnerability Database)
Vulnerability Description
Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the deny-list by simply capitalizing part of the URL scheme (e.g., HTTP://, HTTPS://, or Http://). This allows unauthenticated requests to reach internal network services, including private IP ranges, loopback addresses, and cloud instance metadata endpoints such as HTTP://169.254.169.254/latest/meta-data/. This bypasses the same security control that was patched in CVE-2026-27018. This issue has been fixed in version 8.31.0.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Gotenberg 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gotenberg是Gotenberg开源的一个开发人员友好的 API。用于将多种文档格式转换为 PDF 文件。 Gotenberg 8.30.1及之前版本存在代码问题漏洞，该漏洞源于默认私有IP拒绝列表使用区分大小写的正则表达式匹配URL方案，可能导致绕过拒绝列表并访问内部网络服务。
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

VendorProductAffected VersionsCPESubscribe
gotenberggotenberg <= 8.30.1 -

II. Public POCs for CVE-2026-40280

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III. Intelligence Information for CVE-2026-40280

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IV. Related Vulnerabilities

Same product: gotenberg
Same vendor: gotenberg
Same weakness: CWE-918

V. Comments for CVE-2026-40280

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