CVE-2026-28387 Vulnerability Analysis & Exploit Details

CVE-2026-28387
Vulnerability Scoring

8.1

/10

Severe Risk

Cybersecurity professionals consider CVE-2026-28387 an immediate threat requiring urgent mitigation.

Attack Complexity Details

Attack Complexity: High
Exploits require significant effort and special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: None
No privileges are required for exploitation.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2026-28387 Details

Status: Modified

Last updated: 🕘 10 May 2026, 21:16 UTC
Originally published on: 🕙 07 Apr 2026, 22:16 UTC

Time between publication and last update: 32 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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

CVE-2026-28387 presents a challenge to exploit due to its high attack complexity, but the absence of privilege requirements still makes it a viable target for skilled attackers. A thorough security review is advised.

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.

Confidentiality: High
Exploiting CVE-2026-28387 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: High
CVE-2026-28387 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: High
CVE-2026-28387 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-28387 References

External References

CWE Common Weakness Enumeration

CWE-416

Vulnerable Configurations

cpe:2.3:a:openssl:openssl:1.1.1:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1a:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1a:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1b:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1b:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1c:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1c:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1d:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1d:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1e:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1e:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1f:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1f:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1g:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1g:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1h:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1h:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1i:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1i:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1j:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1j:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1k:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1k:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1l:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1l:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1m:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1m:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1n:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1n:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1o:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1o:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1p:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1p:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1q:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1q:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1r:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1r:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1s:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1s:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1t:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1t:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1u:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1u:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1v:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1v:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1w:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1w:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1x:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1x:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1ze:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:1.1.1ze:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha10:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha10:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha11:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha11:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha12:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha12:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha13:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha13:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha14:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha14:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha15:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha15:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha16:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha16:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha17:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha17:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha5:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha5:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha6:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha6:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha7:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha7:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha8:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha8:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha9:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.0:alpha9:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.3:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.3:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.4:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.4:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.5:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.5:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.6:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.6:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.7:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.7:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.8:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.8:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.9:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.9:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.10:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.10:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.11:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.11:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.12:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.12:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.13:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.13:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.14:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.14:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.15:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.15:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.19:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.0.19:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.0:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.0:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.1:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.1:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.2:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.2:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.3:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.3:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.4:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.4:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.5:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.5:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.6:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.3.6:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.0:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.0:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.1:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.1:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.2:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.2:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.3:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.3:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.4:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.4.4:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.0:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.0:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.1:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.1:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.2:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.2:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.3:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.3:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.4:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.4:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.5:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.5.5:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.6.0:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.6.0:-:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.6.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.6.0:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.6.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.6.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.6.1:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:3.6.1:*:*:*:*:*:*:*

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