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Vulnerability record · CVE-2026-34871 · published 1 April 2026

CVE-2026-34871: Arm mbed tls vulnerability

Arm · Mbed Tls

An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto before 1.1.0. There is a Predictable Seed in a Pseudo-Random Number Generator (PRNG).

6.7 CVSS 3.1 Medium EPSS 0.15% · top 96.3% CWE-338 · CWE-338
6.7CVSS 3.1 base score
0.15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto before 1.1.0. There is a Predictable Seed in a Pseudo-Random Number Generator (PRNG).

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://mbed-tls.readthedocs.io/en/latest/security-advisories/ Vendor Advisory
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-dev-random/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-34877Arm mbed tls execution with unnecessary privileges vulnerabilityAn issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. Insufficient protection of serialized SSL context or session st…EPSS 0.73%9.8CVE-2026-34875Trustedfirmware mbed tls classic buffer overflow vulnerabilityAn 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.EPSS 0.60%9.8CVE-2025-47917Arm mbed tls use after free vulnerabilityMbed TLS before 3.6.4 allows a use-after-free in certain situations of applications that are developed in accordance with the documentation. The func…EPSS 2.1%9.8CVE-2022-46393Arm mbed tls out-of-bounds read vulnerabilityAn issue was discovered in Mbed TLS before 2.28.2 and 3.x before 3.3.0. There is a potential heap-based buffer overflow and heap-based buffer over-re…EPSS 1.2%9.8CVE-2021-44732Arm mbed tls double free vulnerabilityMbed TLS before 3.0.1 has a double free in certain out-of-memory conditions, as demonstrated by an mbedtls_ssl_set_session() failure.EPSS 2.6%9.8CVE-2017-18187Arm mbed tls integer overflow vulnerabilityIn ARM mbed TLS before 2.7.0, there is a bounds-check bypass through an integer overflow in PSK identity parsing in the ssl_parse_client_psk_identity…EPSS 3.1%9.8CVE-2018-0488Arm mbed tls out-of-bounds write vulnerabilityARM mbed TLS before 1.3.22, before 2.1.10, and before 2.7.0, when the truncated HMAC extension and CBC are used, allows remote attackers to execute a…EPSS 4.8%9.8CVE-2018-0487Arm mbed tls memory buffer overflow vulnerabilityARM mbed TLS before 1.3.22, before 2.1.10, and before 2.7.0 allows remote attackers to execute arbitrary code or cause a denial of service (buffer ov…EPSS 3.3%

Source: NIST National Vulnerability Database (record CVE-2026-34871), CISA KEV, FIRST EPSS (scores of 2026-10-01). This page is refreshed as NVD updates the record.