DMTF libspdm 1.4.0 Handshake integrity check

Summaryinfo

A vulnerability labeled as problematic has been found in DMTF libspdm 1.4.0. The affected element is an unknown function of the component Handshake. The manipulation results in integrity check. This vulnerability is identified as CVE-2026-61810. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in DMTF libspdm 1.4.0. It has been classified as problematic. Affected is an unknown part of the component Handshake. The manipulation with an unknown input leads to a integrity check vulnerability. CWE is classifying the issue as CWE-354. The product does not validate or incorrectly validates the integrity check values or "checksums" of a message. This is going to have an impact on integrity. CVE summarizes:

libspdm is a sample implementation that follows the DMTF SPDM specifications. In version 1.4.0, both the FINISH request (Table 80) and the FINISH_RSP response (Table 81) gained two new fields, OpaqueDataLength and OpaqueData, placed before the trailing signed/authenticated field. The transcript definitions used to compute and verify the FINISH signature, the FINISH HMAC (RequesterVerifyData), and the FINISH_RSP HMAC (ResponderVerifyData) were not updated and still terminate with a step of the form. Per DSP0274, the "SPDM Header Fields" are only the four header bytes (SPDMVersion, RequestResponseCode, Param1, Param2). A literal reading therefore excludes OpaqueDataLength and OpaqueData, even though those fields are transmitted before the trailing signature/HMAC field. Because the signature/HMAC must cover every field transmitted before it to "protect the entire handshake against manipulation by an active attacker," an active attacker could otherwise modify the opaque data in flight without invalidating the signature or HMAC. This issue has been patched in version 1.4.1.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-61810 since 07/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available.

Upgrading to version 1.4.1 eliminates this vulnerability.

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Productinfo

Vendor

• DMTF

Name

• libspdm

Version

• 1.4.0

Website

• Product: https://github.com/DMTF/libspdm/

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