CVE-2026-34875

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{"bugzilla": {"description": "mbedtls: Mbed TLS and TF-PSA-Crypto: Arbitrary code execution due to buffer overflow in FFDH key export", "id": "2453963", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453963"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["An issue was discovered in Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0. A buffer overflow can occur in public key export for FFDH keys.", "A flaw was found in Mbed TLS and TF-PSA-Crypto. This vulnerability, a buffer overflow, occurs during the export of public keys for FFDH (Finite Field Diffie-Hellman) keys. A remote attacker could exploit this to potentially execute arbitrary code, gaining full control over the affected system, or cause a denial of service, making the system unavailable."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-34875", "public_date": "2026-04-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34875\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34875\nhttps://mbed-tls.readthedocs.io/en/latest/security-advisories/\nhttps://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-ffdh-buffer-overflow/"], "statement": "Critical: A buffer overflow flaw in Mbed TLS and TF-PSA-Crypto during FFDH public key export could allow a remote attacker to execute arbitrary code or cause a denial of service. Red Hat products utilizing Mbed TLS for FFDH key operations are susceptible if they expose this functionality to untrusted input.", "threat_severity": "Critical"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.6.5]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 97.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "mbedtls", "vendor": "mbed-tls"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.0.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "tf-psa-crypto", "vendor": "mbed-tls"}], "analysis": {"en": {"generated_at": "2026-04-06T16:36:55.301261+00:00", "value": {"mitigation_remediation": ["Apply the latest Mbed TLS patch (v3.6.6 or newer).", "Apply the latest TF\u2011PSA\u2011Crypto patch (v1.0.1 or newer).", "If updating is not immediately possible, restrict or disable access to the FFDH key export functionality within the application.", "Monitor logs for unusual key export activity and perform integrity checks on critical binaries."], "summary": {"action": "Patch Immediately", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "ARM\u2019s Mbed TLS versions up to and including 3.6.5, and TF\u2011PSA\u2011Crypto version 1.0.0 are vulnerable. These are commonly used on embedded devices that rely on cryptographic key generation and export functions.", "description_and_impact": "A buffer overflow occurs during public key export for FFDH keys in Mbed TLS and TF\u2011PSA\u2011Crypto, allowing an attacker to execute arbitrary code. The flaw is a classic memory corruption issue (CWE\u2011120). If exploited, an attacker can run malicious code with the same privileges as the affected application, potentially compromising confidentiality, integrity, and availability of the device or system.", "risk_and_exploitability": "The CVSS score of 9.8 classifies this as critical, yet the EPSS score of less than 1% suggests exploiting this bug is currently unlikely. It is not listed in the CISA KEV catalog. Based on the description, the attacker needs to trigger a key export operation\u2014likely via an exposed API or internal process\u2014before the overflow occurs. This inferred attack vector may allow remote exploitation if the key export function is reachable from a networked interface. The exploit would require a crafted key export request that overflows the buffer and injects code."}}}}, "created": "2026-04-02T07:51:10.783222+00:00", "updated": "2026-04-07T08:07:39.549748+00:00", "vendors": ["mbed-tls", "mbed-tls$PRODUCT$mbedtls", "mbed-tls$PRODUCT$tf-psa-crypto"]}