FKIE_CVE-2026-28387
Vulnerability from fkie_nvd - Published: 2026-04-07 22:16 - Updated: 2026-04-23 15:39
Severity ?
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.
References
{
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "656A0540-5825-498E-A7AB-C14976FEE45D",
"versionEndExcluding": "1.1.1zg",
"versionStartIncluding": "1.1.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B28A8143-89A4-4332-A1F8-A65FB5AA829F",
"versionEndExcluding": "3.0.20",
"versionStartIncluding": "3.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "CF303B21-D9BF-461D-B7B0-A3FE1D557A9F",
"versionEndExcluding": "3.3.7",
"versionStartIncluding": "3.3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "DCCE43D0-8F17-475D-9EE6-842F758A9905",
"versionEndExcluding": "3.4.5",
"versionStartIncluding": "3.4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "F6BC0271-444D-4597-BF05-DC60034EAA49",
"versionEndExcluding": "3.5.6",
"versionStartIncluding": "3.5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4A9E621D-29D8-418A-BF37-BED333C14507",
"versionEndExcluding": "3.6.2",
"versionStartIncluding": "3.6.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Issue summary: An uncommon configuration of clients performing DANE TLSA-based\nserver authentication, when paired with uncommon server DANE TLSA records, may\nresult in a use-after-free and/or double-free on the client side.\n\nImpact summary: A use after free can have a range of potential consequences\nsuch as the corruption of valid data, crashes or execution of arbitrary code.\n\nHowever, the issue only affects clients that make use of TLSA records with both\nthe PKIX-TA(0/PKIX-EE(1) certificate usages and the DANE-TA(2) certificate\nusage.\n\nBy far the most common deployment of DANE is in SMTP MTAs for which RFC7672\nrecommends that clients treat as \u0027unusable\u0027 any TLSA records that have the PKIX\ncertificate usages. 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."
}
],
"id": "CVE-2026-28387",
"lastModified": "2026-04-23T15:39:25.323",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2026-04-07T22:16:20.700",
"references": [
{
"source": "openssl-security@openssl.org",
"tags": [
"Patch"
],
"url": "https://github.com/openssl/openssl/commit/07e727d304746edb49a98ee8f6ab00256e1f012b"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Patch"
],
"url": "https://github.com/openssl/openssl/commit/258a8f63b26995ba357f4326da00e19e29c6acbe"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Patch"
],
"url": "https://github.com/openssl/openssl/commit/444958deaf450aea819171f97ae69eaedede42c3"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Patch"
],
"url": "https://github.com/openssl/openssl/commit/7a4e08cee62a728d32e60b0de89e6764339df0a7"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Patch"
],
"url": "https://github.com/openssl/openssl/commit/ec03fa050b3346997ed9c5fef3d0e16ad7db8177"
},
{
"source": "openssl-security@openssl.org",
"tags": [
"Vendor Advisory"
],
"url": "https://openssl-library.org/news/secadv/20260407.txt"
}
],
"sourceIdentifier": "openssl-security@openssl.org",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "openssl-security@openssl.org",
"type": "Secondary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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