Vulnerability-Lookup

GHSA-R4G2-GW8J-XGXV

Vulnerability from github – Published: 2026-07-28 18:33 – Updated: 2026-07-28 18:33

Details

TinyWeb through 0.0.8 contains a null pointer dereference vulnerability that allows unauthenticated remote attackers to crash worker processes by sending a malformed HTTP request line with an invalid version string. The HttpParser::execute() function fails to allocate the Url object when version parsing fails, leaving the url pointer NULL, and buildResponse() subsequently dereferences this NULL pointer without checking the valid_requ flag, producing a SIGSEGV that terminates the worker process and, when repeated across all workers, takes the server permanently offline until manually restarted.

Severity

7.5 (High)


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

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-67184"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-28T17:17:07Z",
    "severity": "HIGH"
  },
  "details": "TinyWeb through 0.0.8 contains a null pointer dereference vulnerability that allows unauthenticated remote attackers to crash worker processes by sending a malformed HTTP request line with an invalid version string. The HttpParser::execute() function fails to allocate the Url object when version parsing fails, leaving the url pointer NULL, and buildResponse() subsequently dereferences this NULL pointer without checking the valid_requ flag, producing a SIGSEGV that terminates the worker process and, when repeated across all workers, takes the server permanently offline until manually restarted.",
  "id": "GHSA-r4g2-gw8j-xgxv",
  "modified": "2026-07-28T18:33:04Z",
  "published": "2026-07-28T18:33:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67184"
    },
    {
      "type": "WEB",
      "url": "https://github.com/theopaid/Unauthenticated-NULL-Pointer-Dereference-Crashes-the-Server-TinyWeb-"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/tinyweb-null-pointer-dereference-dos-via-malformed-http-request"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-67184 (GCVE-0-2026-67184)

Vulnerability from cvelistv5 – Published: 2026-07-28 16:28 – Updated: 2026-07-28 17:38 X_Open Source

Title

TinyWeb 0.0.8 Null Pointer Dereference DoS via Malformed HTTP Request

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-28 17:38 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6232 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/theopaid/Unauthenticated-NULL-…	technical-descriptionexploit
https://www.vulncheck.com/advisories/tinyweb-null…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
GeneralSandman	TinyWeb	Affected: e48f15d38d2bebeec9cabcfdde81931b10a1963b , ≤ a381da252fe8e873c8aff22703040426cc9b2ae0 (git) Affected: 0.0.8 (semver)

Date Public

2026-07-26 00:00

Credits

Theodosis Paidakis

Show details on NVD website

JSON

To clipboard

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                  },
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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.

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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.
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