CVE-2026-45741Network attack vectorHinoki check available

Cloud metadata access via IPv6 deny-list bypass

Published Aug 19, 2026 · Updated Aug 19, 2026

Server-side request forgery in Gotenberg before 8.33.0 allows remote attackers to read internal HTTP responses via crafted DNS AAAA records. The IsPublicIP function in pkg/gotenberg/outbound.go relies on Go address helpers and addr.Unmap(), but it does not unwrap or block 6to4, NAT64, Teredo, and deprecated site-local IPv6 prefixes that can encode non-public IPv4 targets. Exploitation requires a deployment that routes those IPv6 transition prefixes, such as dual-stack or NAT64-enabled hosts, and can expose cloud metadata responses even when WithDenyPrivateIPs is enabled.

CVSS severity7.5
High
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Server-side request forgery in Gotenberg before 8.33.0 allows remote attackers to read internal HTTP responses via crafted DNS AAAA records. The IsPublicIP function in pkg/gotenberg/outbound.go relies on Go address helpers and addr.Unmap(), but it does not unwrap or block 6to4, NAT64, Teredo, and deprecated site-local IPv6 prefixes that can encode non-public IPv4 targets. Exploitation requires a deployment that routes those IPv6 transition prefixes, such as dual-stack or NAT64-enabled hosts, and can expose cloud metadata responses even when WithDenyPrivateIPs is enabled.

The record

CVE
CVE-2026-45741
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
Gotenberg
Product
Gotenberg
Classifications
CWE-184, CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 8.33.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gotenberg · Gotenbergversion=< 8.33.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
6.9GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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