CVE-2026-28387
Vulnerability Scoring
Analysis In Progress
CVE-2026-28387 Vulnerability Analysis & Exploit Details
CVE-2026-28387
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-28387 Details
Status: Awaiting Analysis
Last updated: 🕘 08 Apr 2026, 21:27 UTC
Originally published on: 🕙 07 Apr 2026, 22:16 UTC
CVSS Release:
CVE-2026-28387 Vulnerability Summary
CVE-2026-28387: 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.
Assessing the Risk of CVE-2026-28387
Access Complexity Graph
The exploitability of CVE-2026-28387 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2026-28387
No exploitability data is available for CVE-2026-28387.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2026-28387, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2026-28387, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-28387 does not compromise confidentiality.
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Integrity:
None
CVE-2026-28387 does not impact data integrity.
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Availability:
None
CVE-2026-28387 does not affect system availability.
CVE-2026-28387 References
External References
- https://github.com/openssl/openssl/commit/07e727d304746edb49a98ee8f6ab00256e1f012b
- https://github.com/openssl/openssl/commit/258a8f63b26995ba357f4326da00e19e29c6acbe
- https://github.com/openssl/openssl/commit/444958deaf450aea819171f97ae69eaedede42c3
- https://github.com/openssl/openssl/commit/7a4e08cee62a728d32e60b0de89e6764339df0a7
- https://github.com/openssl/openssl/commit/ec03fa050b3346997ed9c5fef3d0e16ad7db8177
- https://openssl-library.org/news/secadv/20260407.txt
CWE Common Weakness Enumeration
CWE-416Protect Your Infrastructure against CVE-2026-28387: Combat Critical CVE Threats
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