CVE-2026-28387 (GCVE-0-2026-28387)

Vulnerability from cvelistv5 – Published: 2026-04-07 22:00 – Updated: 2026-05-12 12:08
VLAI
Title
Potential Use-after-free in DANE Client Code
Summary
Issue summary: An uncommon configuration of clients performing DANE TLSA-based server authentication, when paired with uncommon server DANE TLSA records, may result in a use-after-free and/or double-free on the client side. Impact summary: A use after free can have a range of potential consequences such as the corruption of valid data, crashes or execution of arbitrary code. However, the issue only affects clients that make use of TLSA records with both the PKIX-TA(0/PKIX-EE(1) certificate usages and the DANE-TA(2) certificate usage. By far the most common deployment of DANE is in SMTP MTAs for which RFC7672 recommends that clients treat as 'unusable' any TLSA records that have the PKIX certificate usages. These SMTP (or other similar) clients are not vulnerable to this issue. Conversely, any clients that support only the PKIX usages, and ignore the DANE-TA(2) usage are also not vulnerable. The client would also need to be communicating with a server that publishes a TLSA RRset with both types of TLSA records. No FIPS modules are affected by this issue, the problem code is outside the FIPS module boundary.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.6.0 , < 3.6.2 (semver)
Affected: 3.5.0 , < 3.5.6 (semver)
Affected: 3.4.0 , < 3.4.5 (semver)
Affected: 3.3.0 , < 3.3.7 (semver)
Affected: 3.0.0 , < 3.0.20 (semver)
Affected: 1.1.1 , < 1.1.1zg (custom)
Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
Create a notification for this product.
Date Public
2026-04-07 14:00
Credits
Igor Morgenstern (Aisle Research) Viktor Dukhovni Alexandr Nedvedicky
Show details on NVD website
To clipboard 

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These SMTP (or other similar) clients are not vulnerable\\nto this issue.  Conversely, any clients that support only the PKIX usages, and\\nignore the DANE-TA(2) usage are also not vulnerable.\\n\\nThe client would also need to be communicating with a server that publishes a\\nTLSA RRset with both types of TLSA records.\\n\\nNo FIPS modules are affected by this issue, the problem code is outside the\\nFIPS module boundary.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: An uncommon configuration of clients performing DANE TLSA-based\u003cbr\u003eserver authentication, when paired with uncommon server DANE TLSA records, may\u003cbr\u003eresult in a use-after-free and/or double-free on the client side.\u003cbr\u003e\u003cbr\u003eImpact summary: A use after free can have a range of potential consequences\u003cbr\u003esuch as the corruption of valid data, crashes or execution of arbitrary code.\u003cbr\u003e\u003cbr\u003eHowever, the issue only affects clients that make use of TLSA records with both\u003cbr\u003ethe PKIX-TA(0/PKIX-EE(1) certificate usages and the DANE-TA(2) certificate\u003cbr\u003eusage.\u003cbr\u003e\u003cbr\u003eBy far the most common deployment of DANE is in SMTP MTAs for which RFC7672\u003cbr\u003erecommends that clients treat as \u0027unusable\u0027 any TLSA records that have the PKIX\u003cbr\u003ecertificate usages.  These SMTP (or other similar) clients are not vulnerable\u003cbr\u003eto this issue.  Conversely, any clients that support only the PKIX usages, and\u003cbr\u003eignore the DANE-TA(2) usage are also not vulnerable.\u003cbr\u003e\u003cbr\u003eThe client would also need to be communicating with a server that publishes a\u003cbr\u003eTLSA RRset with both types of TLSA records.\u003cbr\u003e\u003cbr\u003eNo FIPS modules are affected by this issue, the problem code is outside the\u003cbr\u003eFIPS module boundary.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-04-07T22:00:51.496Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-28387\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-10T20:10:20.584Z\", \"dateReserved\": \"2026-02-27T13:45:02.161Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-04-07T22:00:51.496Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.