Improper certificate validation for some Intel(R) TDX Workload Attestation software within Ring 3: User Applications may allow an escalation of privilege. Unprivileged software adversary with an unauthenticated user combined with a low comp…

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Improper certificate validation for some Intel(R) TDX Workload Attestation software within Ring 3: User Applications may allow an escalation of privilege. Unprivileged software adversary with an unauthenticated user combined with a low complexity attack may enable data manipulation. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

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10 Nov 2026 16:30:50 UTC

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11 Nov 2026 10:48:01 UTC

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11 Nov 2026 11:57:25 UTC

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CVSS 4.0 · 5.9 CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Improper certificate validation for some Intel(R) TDX Workload Attestation software within Ring 3: User Applications may allow an escalation of privilege. Unprivileged software adversary with an unauthenticated user combined with a low complexity attack may enable data manipulation. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

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Nov 10, 2026, 4:30:50 PM (timezone not stated)

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Nov 11, 2026, 10:48:01 AM (timezone not stated)

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15 Nov 2026 10:05:17 UTC

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EUVD CVSS 4.0 · 5.9 CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Improper certificate validation for some Intel(R) TDX Workload Attestation software within Ring 3: User Applications may allow an escalation of privilege. Unprivileged software adversary with an unauthenticated user combined with a low complexity attack may enable data manipulation. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

Source published

10 Nov 2026 17:17:43 UTC

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11 Nov 2026 11:17:20 UTC

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13 Nov 2026 09:56:59 UTC

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CVSS 4.0 · [email protected] · Secondary · 5.9 CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

`tdx_workload_attestation::verification::x509::verify_x509_cert()`, available with the `host-verification` feature, checked that `issuer_cert` issued `cert` and verified the certificate signature. It did not check the certificate's validity period, so it accepted expired and not-yet-valid certificates. With the `host-gcp-tdx` feature, this function validates the GCP launch endorsement signing certificate against the GCE confidential-computing TCB root certificate. A signing certificate outside its validity period was therefore still accepted during launch endorsement verification. Intel describes the issue as improper certificate validation and classifies it as escalation of privilege, with a CVSS 4.0 base score of 5.9, in INTEL-SA-01520. The flaw was corrected in [#86](https://github.com/IntelLabs/tdx-workload-attestation/pull/86), released in 0.2.0. The function now returns `Ok(false)` when the current time is outside the certificate's `notBefore`/`notAfter` range. Reported by [Borys Tsyrulnikov](https://borystsyrulnikov.dev).

Source published

10 Nov 2026 12:00:00 UTC

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11 Nov 2026 08:45:02 UTC

Saved here

11 Nov 2026 09:25:56 UTC

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CVSS_V4 · CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N