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PatchSiren cyber security CVE debrief

CVE-2026-34875 Mbed TLS CVE debrief

A buffer overflow vulnerability was discovered in Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0. The issue occurs in the public key export for FFDH keys. This vulnerability has a CVSS score of 9.8 and is classified as CRITICAL.

Vendor
Mbed TLS
Product
Mbed TLS
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-01
Original CVE updated
2026-06-05
Advisory published
2026-04-01
Advisory updated
2026-06-05

Who should care

Users of Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0 should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability is caused by a buffer overflow in the public key export for FFDH keys in Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Defensive priority

high

Recommended defensive actions

  • Upgrade to a version of Mbed TLS that is not vulnerable (e.g., Mbed TLS 3.6.6 or later).
  • Upgrade to a version of TF-PSA-Crypto that is not vulnerable (e.g., TF-PSA-Crypto 1.1.0 or later).

Evidence notes

The vulnerability is documented in the CVE record [cve-org]. Detailed information can be found in the NVD entry [nvd].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-34875 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-34875

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-34875 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-34875

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.