Vulnerability-Lookup

CVE-2026-73255 (GCVE-0-2026-73255)

Vulnerability from cvelistv5 – Published: 2026-08-20 17:40 – Updated: 2026-08-25 15:09

Title

Mongoose: Path traversal in SSI #include directives enables arbitrary file read

Summary

Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can control an SSI-enabled file can place directory traversal sequences in an #include file or #include virtual directive. The mg_ssi() function in src/ssi.c concatenates the directive argument into a filesystem path without calling mg_path_is_sane(), allowing an MG_ENABLE_SSI deployment with ssi_pattern configured to disclose files readable by the Mongoose process. This issue is fixed in version 7.22.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 15:09 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7634 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/cesanta/mongoose/security/advi…	x_refsource_CONFIRM
https://github.com/cesanta/mongoose/pull/3611	x_refsource_MISC
https://github.com/cesanta/mongoose/commit/a9df52…	x_refsource_MISC
https://github.com/cesanta/mongoose/releases/tag/7.22	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
cesanta	mongoose	Affected: < 7.22	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-73255

Vulnerability from fkie_nvd - Published: 2026-08-20 18:16 - Updated: 2026-10-18 20:10

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71	Patch
security-advisories@github.com	https://github.com/cesanta/mongoose/pull/3611	Issue Tracking, Patch
security-advisories@github.com	https://github.com/cesanta/mongoose/releases/tag/7.22	Release Notes
security-advisories@github.com	https://github.com/cesanta/mongoose/security/advisories/GHSA-h7m9-764r-7x4x	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	cesanta	mongoose	*

JSON

To clipboard

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    {
      "affectedData": [
        {
          "product": "mongoose",
          "vendor": "cesanta",
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            {
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}

UBUNTU-CVE-2026-73255 (CVE-2026-73255)

Vulnerability from osv_ubuntu – Published: 2026-08-20 18:16 – Updated: 2026-08-20 18:16 – Source website

Details

Severity

6.5 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-73255	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-73255	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "mongoose-webserver-source",
            "binary_version": "7.23+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "mongoose",
        "purl": "pkg:deb/ubuntu/mongoose@7.23+ds-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.21+ds-1",
        "7.21+ds-2",
        "7.22+ds-1",
        "7.23+ds-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can control an SSI-enabled file can place directory traversal sequences in an #include file or #include virtual directive. The mg_ssi() function in src/ssi.c concatenates the directive argument into a filesystem path without calling mg_path_is_sane(), allowing an MG_ENABLE_SSI deployment with ssi_pattern configured to disclose files readable by the Mongoose process. This issue is fixed in version 7.22.",
  "id": "UBUNTU-CVE-2026-73255",
  "modified": "2026-08-20T18:16:00Z",
  "published": "2026-08-20T18:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-73255"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-73255"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-73255"
  ]
}

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

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

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CVE-2026-73255 (GCVE-0-2026-73255)

FKIE_CVE-2026-73255

UBUNTU-CVE-2026-73255 (CVE-2026-73255)

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Nomenclature

Vulnerability timeline

Related by attack behaviour