8.1

CVE-2026-28387

Potential Use-after-free in DANE Client Code

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
OpenSSL ≫ OpenSSL Version >= 1.1.1 < 1.1.1zg
OpenSSL ≫ OpenSSL Version >= 3.0.0 < 3.0.20
OpenSSL ≫ OpenSSL Version >= 3.3.0 < 3.3.7
OpenSSL ≫ OpenSSL Version >= 3.4.0 < 3.4.5
OpenSSL ≫ OpenSSL Version >= 3.5.0 < 3.5.6
OpenSSL ≫ OpenSSL Version >= 3.6.0 < 3.6.2
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.63% 0.454
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
134c704f-9b21-4f2e-91b3-4a467353bcc0 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://openssl-library.org/news/secadv/20260407.txt
Vendor Advisory
https://github.com/openssl/openssl/commit/07e727d304746edb49a98ee8f6ab00256e1f012b
Patch
https://github.com/openssl/openssl/commit/258a8f63b26995ba357f4326da00e19e29c6acbe
Patch
https://github.com/openssl/openssl/commit/444958deaf450aea819171f97ae69eaedede42c3
Patch
https://github.com/openssl/openssl/commit/7a4e08cee62a728d32e60b0de89e6764339df0a7
Patch
https://github.com/openssl/openssl/commit/ec03fa050b3346997ed9c5fef3d0e16ad7db8177
Patch
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
https://cert-portal.siemens.com/productcert/html/ssa-265688.html