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CVE-2026-28387— Potential Use-after-free in DANE Client Code

Quick assessment

Affected
OpenSSL OpenSSL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL存在安全漏洞，该漏洞源于处理不常见的DANE TLSA记录配置时可能导致释放后重用和双重释放，可能导致数据损坏、崩溃或执行任意代码。

AI Predicted 7.8 Difficulty: Hard EPSS 0.94% · P60

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
OpenSSL OpenSSL 3.6.0< 3.6.2 affected
3.5.0< 3.5.6 affected
3.4.0< 3.4.5 affected
3.3.0< 3.3.7 affected
3.0.0< 3.0.20 affected
1.1.1< 1.1.1zg affected
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I. Basic Information for CVE-2026-28387

Vulnerability Information
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Vulnerability Title
Potential Use-after-free in DANE Client Code
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL存在安全漏洞，该漏洞源于处理不常见的DANE TLSA记录配置时可能导致释放后重用和双重释放，可能导致数据损坏、崩溃或执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSSL OpenSSL 3.6.0 ~ 3.6.2 -

II. Public POCs for CVE-2026-28387

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III. Intelligence Information for CVE-2026-28387

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Vendor Advisories for CVE-2026-28387 (1)

Same Patch Batch · OpenSSL · 2026-04-07 · 7 CVEs total

CVE-2026-31789 Heap Buffer Overflow in Hexadecimal Conversion
CVE-2026-31790 Incorrect Failure Handling in RSA KEM RSASVE Encapsulation
CVE-2026-28388 NULL Pointer Dereference When Processing a Delta CRL
CVE-2026-28386 Out-of-bounds Read in AES-CFB-128 on X86-64 with AVX-512 Support
CVE-2026-28390 Possible NULL Dereference When Processing CMS KeyTransportRecipientInfo
CVE-2026-28389 Possible NULL Dereference When Processing CMS KeyAgreeRecipientInfo

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL
Same weakness: CWE-416

V. Comments for CVE-2026-28387

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