VulnSocial

CVE-2026-40280Disclosure(thecodingmachine / gotenberg)

LOWCVSS 7.5 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD 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.

thecodingmachine CVEsBack to dashboard
1.5/ 10 priority

Sources & remediation

Patch / fix
Exploit / PoC references
Other references
Weakness type (CWE)
CWE-918

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • gotenberg

Threat summary

  • Public PoC is present in monitored signal
  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • PoC mentioned or linked in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 3 classified signals
  • Peaked 1d ago at 2 mentions (2026-05-05); latest day: 1
  • 3 total mentions across 2 days

Affected systems

Vendors
thecodingmachine
Products
gotenberg

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-05-05: 2Mentions · 2026-08-14: 1PoC Mentioned / Linked · 2026-08-14: 1Technical Details · 2026-05-05: 2Technical Details · 2026-08-14: 105-0508-14
Signal classification1 categories
Disclosure
3100.0%
Referenced assets4 URLs
Classification over time
DateTotalLabels
2026-05-052
Disclosure2
2026-08-141
Disclosure1
Full discourse3 posts
  • pdnuclei-bot@pdnuclei_bot
    Disclosure

    🚨 CVE-2026-40280 - critical 🚨 Gotenberg <= 8.30.1 - Server Side Request Forgery > Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, t... 👾 https://cloud.projectdiscovery.io/library/CVE-2026-40280 @pdnuclei #NucleiTemplates #cve

    Post summary

    A critical Server Side Request Forgery vulnerability (CVE‑2026‑40280) affecting Gotenberg versions up to 8.30.1 is disclosed with technical details and a link to further information.

    02092545
    1.3K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-40280 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-f… https://www.cve.org/CVERecord?id=CVE-2026-40280

    Post summary

    CVE-2026-40280 highlights a configuration issue in Gotenberg’s private‑IP deny‑lists for versions up to 8.30.1, with no PoC, exploit, or active exploitation details reported. The entry serves as an initial vulnerability disclosure.

    00010150
    57.4K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-40280 Deny-List Bypass via Case-Sensitive Regex in Gotenberg Versions 8... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-40280 Vulnerability Alert Subscriptions: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=1

    Post summary

    The tweet announces CVE‑2026‑40280, noting a deny‑list bypass via case‑sensitive regex in Gotenberg v8, with no PoC, exploit, or patch details provided.

    0000040
    4.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appthecodingmachinegotenberg---

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