CVE-2026-55995 (GCVE-0-2026-55995)

Vulnerability from cvelistv5 – Published: 2026-07-29 13:43 – Updated: 2026-07-29 14:43
VLAI
Title
Double-free in the iSNS attribute decoder in open-iscsi
Summary
A Double Free vulnerability in open-iscsi allows an unauthenticated MITM attacker to cause DoS. This issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.
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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 14:43 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
open-iscsi open-iscsi Affected: ? , ≤ 56718d4e9d1a4f51c30697b5c0534144bb41c9bb (git)
guessed Create a notification for this product.
Date Public
2026-07-28 11:45
Credits
Keith at Linneman Labs
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55995",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-29T14:43:46.830977Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-29T14:43:55.157Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageName": "open-iscsi",
          "product": "open-iscsi",
          "vendor": "open-iscsi",
          "versions": [
            {
              "lessThanOrEqual": "56718d4e9d1a4f51c30697b5c0534144bb41c9bb",
              "status": "affected",
              "version": "?",
              "versionType": "git"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Keith at Linneman Labs"
        }
      ],
      "datePublic": "2026-07-28T11:45:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cdiv\u003eA Double Free vulnerability in open-iscsi allows an\u0026nbsp;\u003cspan\u003eunauthenticated\u003c/span\u003e\u0026nbsp;MITM attacker to cause\u0026nbsp;\u003cspan\u003eDoS.\u003c/span\u003e\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cp\u003eThis issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.\u003c/p\u003e"
            }
          ],
          "value": "A Double Free vulnerability in open-iscsi allows an\u00a0unauthenticated\u00a0MITM attacker to cause\u00a0DoS.\n\n\n\n\n\n\nThis issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-415",
              "description": "CWE-415: Double Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-29T13:43:22.381Z",
        "orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
        "shortName": "suse"
      },
      "references": [
        {
          "url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55995"
        },
        {
          "url": "https://github.com/open-iscsi/open-isns/commit/56718d4e9d1a4f51c30697b5c0534144bb41c9bb"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Double-free in the iSNS attribute decoder in open-iscsi",
      "x_generator": {
        "engine": "Vulnogram 1.0.4"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
    "assignerShortName": "suse",
    "cveId": "CVE-2026-55995",
    "datePublished": "2026-07-29T13:43:22.381Z",
    "dateReserved": "2026-06-18T09:26:55.987Z",
    "dateUpdated": "2026-07-29T14:43:55.157Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-55995",
      "date": "2026-08-27",
      "epss": "0.00252",
      "percentile": "0.16397"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-11T01:04:58.000Z",
      "cve": "CVE-2026-55995",
      "id": "msrc_CVE-2026-55995",
      "initial_release_date": "2026-08-07T01:15:18.000Z",
      "product_status:fixed": "2",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Double-free in the iSNS attribute decoder in open-iscsi",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-55995.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-55995\",\"sourceIdentifier\":\"meissner@suse.de\",\"published\":\"2026-07-29T14:16:31.423\",\"lastModified\":\"2026-07-30T16:43:03.817\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A Double Free vulnerability in open-iscsi allows an\u00a0unauthenticated\u00a0MITM attacker to cause\u00a0DoS.\\n\\n\\n\\n\\n\\n\\nThis issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.\"}],\"affected\":[{\"source\":\"meissner@suse.de\",\"affectedData\":[{\"vendor\":\"open-iscsi\",\"product\":\"open-iscsi\",\"defaultStatus\":\"unaffected\",\"packageName\":\"open-iscsi\",\"versions\":[{\"version\":\"?\",\"lessThanOrEqual\":\"56718d4e9d1a4f51c30697b5c0534144bb41c9bb\",\"versionType\":\"git\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"meissner@suse.de\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"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\",\"baseScore\":8.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-07-29T14:43:46.830977Z\",\"id\":\"CVE-2026-55995\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"meissner@suse.de\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-415\"}]}],\"references\":[{\"url\":\"https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55995\",\"source\":\"meissner@suse.de\"},{\"url\":\"https://github.com/open-iscsi/open-isns/commit/56718d4e9d1a4f51c30697b5c0534144bb41c9bb\",\"source\":\"meissner@suse.de\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-27T01:54:56+00:00",
      "cve": "CVE-2026-55995",
      "id": "CVE-2026-55995",
      "initial_release_date": "2026-07-29T13:43:22.381000+00:00",
      "product_status:fixed": "226",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "open-isns: open-iscsi: Denial of Service via double-free in iSNS attribute decoder",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55995.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-06T01:12:36Z",
      "cve": "CVE-2026-55995",
      "id": "CVE-2026-55995",
      "initial_release_date": "2026-08-06T01:12:36Z",
      "product_status:known_affected": "62",
      "product_status:recommended": "2",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-55995",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-55995.json",
      "version": "2"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-55995\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-29T14:43:46.830977Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-29T14:43:50.383Z\"}}], \"cna\": {\"title\": \"Double-free in the iSNS attribute decoder in open-iscsi\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Keith at Linneman Labs\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 8.7, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"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\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"open-iscsi\", \"product\": \"open-iscsi\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"versionType\": \"git\", \"lessThanOrEqual\": \"56718d4e9d1a4f51c30697b5c0534144bb41c9bb\"}], \"packageName\": \"open-iscsi\", \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-07-28T11:45:00.000Z\", \"references\": [{\"url\": \"https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-55995\"}, {\"url\": \"https://github.com/open-iscsi/open-isns/commit/56718d4e9d1a4f51c30697b5c0534144bb41c9bb\"}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.4\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A Double Free vulnerability in open-iscsi allows an\\u00a0unauthenticated\\u00a0MITM attacker to cause\\u00a0DoS.\\n\\n\\n\\n\\n\\n\\nThis issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cdiv\u003eA Double Free vulnerability in open-iscsi allows an\u0026nbsp;\u003cspan\u003eunauthenticated\u003c/span\u003e\u0026nbsp;MITM attacker to cause\u0026nbsp;\u003cspan\u003eDoS.\u003c/span\u003e\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cp\u003eThis issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-415\", \"description\": \"CWE-415: Double Free\"}]}], \"providerMetadata\": {\"orgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"shortName\": \"suse\", \"dateUpdated\": \"2026-07-29T13:43:22.381Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-55995\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-29T14:43:55.157Z\", \"dateReserved\": \"2026-06-18T09:26:55.987Z\", \"assignerOrgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"datePublished\": \"2026-07-29T13:43:22.381Z\", \"assignerShortName\": \"suse\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.