CVE-2025-15104 (GCVE-0-2025-15104)

Vulnerability from cvelistv5 – Published: 2026-01-16 14:00 – Updated: 2026-01-16 14:30
VLAI
Title
Nu Html Checker (validator.nu) - Restriction bypass vulnerability allowing local SSRF
Summary
Nu Html Checker (validator.nu) contains a restriction bypass that allows remote attackers to make the server perform arbitrary HTTP/HTTPS requests to internal resources, including localhost services. While the validator implements hostname-based protections to block direct access to localhost and 127.0.0.1, these controls can be bypassed using DNS rebinding techniques or domains that resolve to loopback addresses.This issue affects The Nu Html Checker (vnu): latest (commit 23f090a11bab8d0d4e698f1ffc197a4fe226a9cd).
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-16 14:30 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
Fluid Attacks CNA
CNA scorecard B 89/100 over 58 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
The Nu Html Checker The Nu Html Checker Affected: latest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cd
    cpe:2.3:a:the_nu_html_checker:the_nu_html_checker:latest_-_commit_23f090a11bab8d0d4e698f1ffc197a4fe226a9cd:*:windows:*:*:*:*:*
    cpe:2.3:a:the_nu_html_checker:the_nu_html_checker:latest_-_commit_23f090a11bab8d0d4e698f1ffc197a4fe226a9cd:*:linux:*:*:*:*:*
    cpe:2.3:a:the_nu_html_checker:the_nu_html_checker:latest_-_commit_23f090a11bab8d0d4e698f1ffc197a4fe226a9cd:*:macos:*:*:*:*:*
Create a notification for this product.
Credits
Oscar Uribe
Show details on NVD website
To clipboard 

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            "discovery": "UNKNOWN"
          },
          "title": "Nu Html Checker (validator.nu) - Restriction bypass vulnerability allowing local SSRF",
          "x_generator": {
            "engine": "Vulnogram 0.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "84fe0718-d6bb-4716-a7e8-81a6d1daa869",
        "assignerShortName": "Fluid Attacks",
        "cveId": "CVE-2025-15104",
        "datePublished": "2026-01-16T14:00:16.643Z",
        "dateReserved": "2025-12-26T13:34:45.583Z",
        "dateUpdated": "2026-01-16T14:30:55.715Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.