CVE-2026-15171 (GCVE-0-2026-15171)

Vulnerability from cvelistv5 – Published: 2026-07-08 20:51 – Updated: 2026-07-08 20:51
VLAI
Title
NULL Pointer Dereference in Wireshark
Summary
SSH protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allows denial of service
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Wireshark Foundation Wireshark Affected: 4.6.0 , < 4.6.7 (semver)
Affected: 4.4.0 , < 4.4.17 (semver)
Create a notification for this product.
Credits
Dmitrijs Trizna
Show details on NVD website
To clipboard 

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        }
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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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          "scenarios": [
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              "value": "GENERAL"
            }
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      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-476: NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-08T20:51:10.283Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "url": "https://www.wireshark.org/security/wnpa-sec-2026-55.html"
        },
        {
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        }
      ],
      "solutions": [
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          "lang": "en",
          "value": "Upgrade to version 4.6.7 or above"
        }
      ],
      "title": "NULL Pointer Dereference in Wireshark"
    }
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    "assignerShortName": "GitLab",
    "cveId": "CVE-2026-15171",
    "datePublished": "2026-07-08T20:51:10.283Z",
    "dateReserved": "2026-07-08T20:45:53.857Z",
    "dateUpdated": "2026-07-08T20:51:10.283Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-15171\",\"sourceIdentifier\":\"cve@gitlab.com\",\"published\":\"2026-07-08T21:16:47.990\",\"lastModified\":\"2026-07-08T21:16:47.990\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"SSH protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allows denial of service\"}],\"affected\":[{\"source\":\"cve@gitlab.com\",\"affectedData\":[{\"vendor\":\"Wireshark Foundation\",\"product\":\"Wireshark\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"4.6.0\",\"lessThan\":\"4.6.7\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.4.0\",\"lessThan\":\"4.4.17\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cve@gitlab.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"cve@gitlab.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"references\":[{\"url\":\"https://gitlab.com/wireshark/wireshark/-/work_items/21378\",\"source\":\"cve@gitlab.com\"},{\"url\":\"https://www.wireshark.org/security/wnpa-sec-2026-55.html\",\"source\":\"cve@gitlab.com\"}]}}"
  }
}


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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

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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.


Detection rules are retrieved from Rulezet.