Technology · Arm
Arm Mbed TLS vulnerabilities
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Junglewise Threat Intelligence has tracked 14 vulnerabilities in Arm Mbed TLS: 0 in the last 7 days and 1 in the last 90 days, 3 of them critical and 0 exploited in the wild. The most recent, CVE-2026-25832, was published on 14 September 2026. Nothing in the last four weeks, down from 1 vulnerability in the four before.
- Last 7 days
- 0
- Last 90 days
- 1
- Critical, all time
- 3
- Exploited in the wild
- 0
About Arm Mbed TLS
An open source, portable, easy to use, readable and flexible SSL library.
Latest Arm Mbed TLS vulnerabilities
- CVE-2026-25832: Mbed TLS TLS 1.3 HelloRetryRequest group validation bypasslowCVSS 3.7EPSS 0.3%
- CVE-2026-34877: Mbed TLS memory corruption via insecure deserialization of SSL contextcriticalCVSS 9.8EPSS 0.2%
- CVE-2026-34876: Mbed TLS out-of-bounds read in mbedtls_ccm_finishhighCVSS 7.5EPSS 0.0%
- CVE-2026-34873: Mbed TLS client impersonation in TLS 1.3 session resumptioncriticalCVSS 9.1EPSS 0.0%
- CVE-2025-66442: In Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) that only…mediumCVSS 5.1EPSS 0.3%
- CVE-2026-34874: Mbed TLS NULL pointer dereference in X.509 distinguished name parsinghighCVSS 7.5EPSS 0.1%
- CVE-2026-34871: Arm Mbed TLS Predictable Seed in PRNG on LinuxmediumCVSS 6.7EPSS 0.0%
- CVE-2026-25835: Arm Mbed TLS and TF-PSA-Crypto PRNG state cloning vulnerabilityhighCVSS 7.7EPSS 0.0%
- CVE-2026-25833: Mbed TLS buffer underflow in x509_inet_pton_ipv6highCVSS 7.5EPSS 0.1%
- CVE-2026-34875: Mbed TLS buffer overflow in FFDH public key exportcriticalCVSS 9.8EPSS 0.1%
- CVE-2026-25834: Mbed TLS algorithm downgrade in TLS 1.2 clientmediumCVSS 6.5EPSS 0.0%
- CVE-2025-49087: Mbed TLS timing side-channel in block cipher decryption with PKCS#7 paddingmediumCVSS 4EPSS 0.4%
- CVE-2025-49601: Mbed TLS out-of-bounds read in mbedtls_lms_import_public_keymediumCVSS 4.8EPSS 0.3%
- CVE-2025-49600: Mbed TLS signature bypass in LMS verificationmediumCVSS 4.9EPSS 0.1%
Most severe Arm Mbed TLS vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-34877: Mbed TLS memory corruption via insecure deserialization of SSL contextcriticalCVSS 9.8EPSS 0.2%
- CVE-2026-34875: Mbed TLS buffer overflow in FFDH public key exportcriticalCVSS 9.8EPSS 0.1%
- CVE-2026-34873: Mbed TLS client impersonation in TLS 1.3 session resumptioncriticalCVSS 9.1EPSS 0.0%
- CVE-2026-25835: Arm Mbed TLS and TF-PSA-Crypto PRNG state cloning vulnerabilityhighCVSS 7.7EPSS 0.0%
- CVE-2026-34874: Mbed TLS NULL pointer dereference in X.509 distinguished name parsinghighCVSS 7.5EPSS 0.1%
- CVE-2026-25833: Mbed TLS buffer underflow in x509_inet_pton_ipv6highCVSS 7.5EPSS 0.1%
- CVE-2026-34876: Mbed TLS out-of-bounds read in mbedtls_ccm_finishhighCVSS 7.5EPSS 0.0%
- CVE-2026-34871: Arm Mbed TLS Predictable Seed in PRNG on LinuxmediumCVSS 6.7EPSS 0.0%
- CVE-2026-25834: Mbed TLS algorithm downgrade in TLS 1.2 clientmediumCVSS 6.5EPSS 0.0%
- CVE-2025-66442: In Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) that only…mediumCVSS 5.1EPSS 0.3%
Vulnerabilities per week
Nothing in the last four weeks, down from 1 vulnerability in the four before. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 1 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Arm Mbed TLS vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/mbed-tls)<a href="https://junglewise.ai/threats/technologies/mbed-tls"><img src="https://junglewise.ai/threats/technologies/mbed-tls/badge.svg" alt="Arm Mbed TLS vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/mbed-tls.json, and this page as text at https://junglewise.ai/threats/technologies/mbed-tls.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Arm Mbed TLS vulnerabilities", https://junglewise.ai/threats/technologies/mbed-tls, 9 November 2026.