CVE-2026-28387
Published:April 07, 2026
Updated:April 25, 2026
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.
Affected Packages
openssl (CONAN):
Affected version(s) >=3.6.0 <3.6.2Fix Suggestion:
Update to version 3.6.2openssl (CONAN):
Affected version(s) >=3.0.5 <3.0.20Fix Suggestion:
Update to version 3.0.20openssl (CONAN):
Affected version(s) >=3.4.0 <3.4.5Fix Suggestion:
Update to version 3.4.5openssl (CONAN):
Affected version(s) >=3.5.0 <3.5.6Fix Suggestion:
Update to version 3.5.6openssl (CONAN):
Affected version(s) >=3.3.1 <3.3.7Fix Suggestion:
Update to version 3.3.7openssl (CONDA):
Affected version(s) >=3.5.0 <3.5.6Fix Suggestion:
Update to version 3.5.6openssl (CONDA):
Affected version(s) >=3.4.0 <3.4.5Fix Suggestion:
Update to version 3.4.5openssl (CONDA):
Affected version(s) >=3.0.0 <3.0.20Fix Suggestion:
Update to version 3.0.20openssl (CONDA):
Affected version(s) >=3.3.0 <3.3.7Fix Suggestion:
Update to version 3.3.7openssl (CONDA):
Affected version(s) >=3.6.0 <3.6.2Fix Suggestion:
Update to version 3.6.2https://github.com/openssl/openssl.git (GITHUB):
Affected version(s) >=openssl-3.0.0 <openssl-3.0.20Fix Suggestion:
Update to version openssl-3.0.20https://github.com/openssl/openssl.git (GITHUB):
Affected version(s) >=openssl-3.5.0 <openssl-3.5.6Fix Suggestion:
Update to version openssl-3.5.6https://github.com/openssl/openssl.git (GITHUB):
Affected version(s) >=openssl-3.6.0 <openssl-3.6.2Fix Suggestion:
Update to version openssl-3.6.2https://github.com/openssl/openssl.git (GITHUB):
Affected version(s) >=openssl-3.4.0 <openssl-3.4.5Fix Suggestion:
Update to version openssl-3.4.5https://github.com/openssl/openssl.git (GITHUB):
Affected version(s) >=openssl-3.3.0 <openssl-3.3.7Fix Suggestion:
Update to version openssl-3.3.7https://github.com/openssl/openssl.git (GITHUB):
Affected version(s) >=OpenSSL_1_1_1 <openssl-1.1.1zgFix Suggestion:
Update to version openssl-1.1.1zgRelated Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Use After Free
EPSS
Base Score:
0.03
