GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-61908 (GCVE-0-2026-61908)

Vulnerability from cvelistv5 – Published: 2026-09-09 00:00 – Updated: 2026-09-10 18:59
VLAI
Summary
An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H<emailid>-<index>, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory.
Severity
3.1 (Low)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 18:58 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
cyrusimap Cyrus IMAP Affected: 0 , < 3.8.8 (semver)
Affected: 3.9.0 , < 3.10.4 (semver)
Affected: 3.11.0 , < 3.12.4 (semver)
    cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*
    cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*
    cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-61908",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-10T18:58:39.917684Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-10T18:59:01.259Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Cyrus IMAP",
          "vendor": "cyrusimap",
          "versions": [
            {
              "lessThan": "3.8.8",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.10.4",
              "status": "affected",
              "version": "3.9.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.12.4",
              "status": "affected",
              "version": "3.11.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.8.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.10.4",
                  "versionStartIncluding": "3.9.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.12.4",
                  "versionStartIncluding": "3.11.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H\u003cemailid\u003e-\u003cindex\u003e, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.1,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-09T19:44:57.533Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://cyrusimap.org"
        },
        {
          "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html"
        },
        {
          "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html"
        },
        {
          "url": "https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html"
        }
      ],
      "x_generator": {
        "engine": "enrichogram 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-61908",
    "datePublished": "2026-09-09T00:00:00.000Z",
    "dateReserved": "2026-07-13T00:00:00.000Z",
    "dateUpdated": "2026-09-10T18:59:01.259Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-61908",
      "date": "2026-09-16",
      "epss": "0.00205",
      "percentile": "0.1071"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-61908\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2026-09-09T20:18:36.383\",\"lastModified\":\"2026-09-16T15:24:33.310\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H\u003cemailid\u003e-\u003cindex\u003e, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory.\"}],\"affected\":[{\"source\":\"cve@mitre.org\",\"affectedData\":[{\"vendor\":\"cyrusimap\",\"product\":\"Cyrus IMAP\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"3.8.8\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.9.0\",\"lessThan\":\"3.10.4\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.11.0\",\"lessThan\":\"3.12.4\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cve@mitre.org\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N\",\"baseScore\":3.1,\"baseSeverity\":\"LOW\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.6,\"impactScore\":1.4},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-10T18:58:39.917684Z\",\"id\":\"CVE-2026-61908\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"cve@mitre.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"3.8.8\",\"matchCriteriaId\":\"28C57505-AC73-4870-AF38-C27602313743\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.9.0\",\"versionEndExcluding\":\"3.10.4\",\"matchCriteriaId\":\"B34CFCEF-7C23-40E2-8B1C-99574EAEFA83\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.11.0\",\"versionEndExcluding\":\"3.12.4\",\"matchCriteriaId\":\"F48F621D-9615-43D9-9086-7A506473291B\"}]}]}],\"references\":[{\"url\":\"https://cyrusimap.org\",\"source\":\"cve@mitre.org\",\"tags\":[\"Product\"]},{\"url\":\"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Release Notes\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-16T15:52:41+00:00",
      "cve": "CVE-2026-61908",
      "id": "CVE-2026-61908",
      "initial_release_date": "2026-09-10T07:41:48.540000+00:00",
      "product_status:known_affected": "20",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "cyrus-imapd: cyrus-imapd: JMAP email-header blob ID out-of-bounds index",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61908.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-10T16:50:45Z",
      "cve": "CVE-2026-61908",
      "id": "CVE-2026-61908",
      "initial_release_date": "2026-09-10T16:50:45Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-61908",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-61908.json",
      "version": "2"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-61908\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-10T18:58:39.917684Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-10T18:58:50.439Z\"}}], \"cna\": {\"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 3.1, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"LOW\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"cyrusimap\", \"product\": \"Cyrus IMAP\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"3.8.8\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.9.0\", \"lessThan\": \"3.10.4\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.11.0\", \"lessThan\": \"3.12.4\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://cyrusimap.org\"}, {\"url\": \"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html\"}, {\"url\": \"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html\"}, {\"url\": \"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html\"}], \"x_generator\": {\"engine\": \"enrichogram 0.0.1\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H\u003cemailid\u003e-\u003cindex\u003e, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"3.8.8\"}, {\"criteria\": \"cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"3.10.4\", \"versionStartIncluding\": \"3.9.0\"}, {\"criteria\": \"cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"3.12.4\", \"versionStartIncluding\": \"3.11.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"shortName\": \"mitre\", \"dateUpdated\": \"2026-09-09T19:44:57.533Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-61908\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-10T18:59:01.259Z\", \"dateReserved\": \"2026-07-13T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2026-09-09T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "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.


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.