CVE-2026-4942 (GCVE-0-2026-4942)

Vulnerability from cvelistv5 – Published: 2026-07-17 19:32 – Updated: 2026-07-17 19:32
VLAI
Title
IBM i is Affected by Algorithm Downgrade in Transport Layer Security []
Summary
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to send a specifically crafted message and downgrade the Transport Layer Security (TLS) protocol to a version disabled in the server configuration.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
ibm
References
URL Tags
https://www.ibm.com/support/pages/node/7278992 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM i Affected: 7.6
Affected: 7.5
Affected: 7.4
Affected: 7.3
    cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*
 Create a notification for this product.
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          "cpes": [
            "cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*"
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          "vendor": "IBM",
          "versions": [
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              "status": "affected",
              "version": "7.6"
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            {
              "status": "affected",
              "version": "7.5"
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              "status": "affected",
              "version": "7.4"
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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        "orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
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        }
      ],
      "title": "IBM i is Affected by Algorithm Downgrade in Transport Layer Security []",
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    "assignerShortName": "ibm",
    "cveId": "CVE-2026-4942",
    "datePublished": "2026-07-17T19:32:02.440Z",
    "dateReserved": "2026-03-26T21:14:44.344Z",
    "dateUpdated": "2026-07-17T19:32:02.440Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-4942",
      "date": "2026-07-19",
      "epss": "0.00405",
      "percentile": "0.32765"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-4942\",\"sourceIdentifier\":\"psirt@us.ibm.com\",\"published\":\"2026-07-17T20:17:23.560\",\"lastModified\":\"2026-07-17T20:17:23.560\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to send a specifically crafted message and downgrade the Transport Layer Security (TLS) protocol to a version disabled in the server configuration.\"}],\"affected\":[{\"source\":\"psirt@us.ibm.com\",\"affectedData\":[{\"vendor\":\"IBM\",\"product\":\"i\",\"cpes\":[\"cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*\"],\"versions\":[{\"version\":\"7.6\",\"status\":\"affected\"},{\"version\":\"7.5\",\"status\":\"affected\"},{\"version\":\"7.4\",\"status\":\"affected\"},{\"version\":\"7.3\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@us.ibm.com\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"psirt@us.ibm.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-757\"}]}],\"references\":[{\"url\":\"https://www.ibm.com/support/pages/node/7278992\",\"source\":\"psirt@us.ibm.com\"}]}}"
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}



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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

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.