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146 vulnerabilities found for mbed_tls by arm
CVE-2026-34877 (GCVE-0-2026-34877)
Vulnerability from nvd – Published: 2026-04-02 00:00 – Updated: 2026-04-02 17:52
VLAI?
Summary
An 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 structures allows an attacker who can modify the serialized structures to induce memory corruption, leading to arbitrary code execution. This is caused by Incorrect Use of Privileged APIs.
Severity ?
9.8 (Critical)
CWE
- n/a
Assigner
References
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CVE-2026-34876 (GCVE-0-2026-34876)
Vulnerability from nvd – Published: 2026-04-02 00:00 – Updated: 2026-04-02 15:54
VLAI?
Summary
An issue was discovered in Mbed TLS 3.x before 3.6.6. An out-of-bounds read vulnerability in mbedtls_ccm_finish() in library/ccm.c allows attackers to obtain adjacent CCM context data via invocation of the multipart CCM API with an oversized tag_len parameter. This is caused by missing validation of the tag_len parameter against the size of the internal 16-byte authentication buffer. The issue affects the public multipart CCM API in Mbed TLS 3.x, where mbedtls_ccm_finish() can be invoked directly by applications. In Mbed TLS 4.x versions prior to the fix, the same missing validation exists in the internal implementation; however, the function is not exposed as part of the public API. Exploitation requires application-level invocation of the multipart CCM API.
Severity ?
7.5 (High)
CWE
- n/a
Assigner
References
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CVE-2026-34873 (GCVE-0-2026-34873)
Vulnerability from nvd – Published: 2026-04-01 00:00 – Updated: 2026-04-02 16:24
VLAI?
Summary
An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.
Severity ?
9.1 (Critical)
CWE
- n/a
Assigner
References
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CVE-2026-34872 (GCVE-0-2026-34872)
Vulnerability from nvd – Published: 2026-04-01 00:00 – Updated: 2026-04-01 19:52
VLAI?
Summary
An issue was discovered in Mbed TLS 3.5.x and 3.6.x through 3.6.5 and TF-PSA-Crypto 1.0. There is a lack of contributory behavior in FFDH due to improper input validation. Using finite-field Diffie-Hellman, the other party can force the shared secret into a small set of values (lack of contributory behavior). This is a problem for protocols that depend on contributory behavior (which is not the case for TLS). The attack can be carried by the peer, or depending on the protocol by an active network attacker (person in the middle).
Severity ?
9.1 (Critical)
CWE
- n/a
Assigner
References
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CVE-2025-66442 (GCVE-0-2025-66442)
Vulnerability from nvd – Published: 2026-04-01 00:00 – Updated: 2026-04-01 20:00
VLAI?
Summary
In Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) that only occurs with LLVM's select-optimize feature. TF-PSA-Crypto through 1.0.0 is also affected.
Severity ?
5.1 (Medium)
CWE
- n/a
Assigner
References
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CVE-2026-34874 (GCVE-0-2026-34874)
Vulnerability from nvd – Published: 2026-04-01 00:00 – Updated: 2026-04-01 19:24
VLAI?
Summary
An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0.
Severity ?
7.5 (High)
CWE
- n/a
Assigner
References
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CVE-2026-34871 (GCVE-0-2026-34871)
Vulnerability from nvd – Published: 2026-04-01 00:00 – Updated: 2026-04-01 20:04
VLAI?
Summary
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).
Severity ?
6.7 (Medium)
CWE
- n/a
Assigner
References
{
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CVE-2026-25835 (GCVE-0-2026-25835)
Vulnerability from nvd – Published: 2026-04-01 00:00 – Updated: 2026-04-01 20:07
VLAI?
Summary
Mbed TLS before 3.6.6 and TF-PSA-Crypto before 1.1.0 misuse seeds in a Pseudo-Random Number Generator (PRNG).
Severity ?
7.7 (High)
CWE
- n/a
Assigner
References
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CVE-2026-25833 (GCVE-0-2026-25833)
Vulnerability from nvd – Published: 2026-04-01 00:00 – Updated: 2026-04-01 19:21
VLAI?
Summary
Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509_inet_pton_ipv6() function
Severity ?
7.5 (High)
CWE
- n/a
Assigner
References
{
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"integrityImpact": "NONE",
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"scope": "UNCHANGED",
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CVE-2026-34875 (GCVE-0-2026-34875)
Vulnerability from nvd – Published: 2026-04-01 00:00 – Updated: 2026-04-01 18:29
VLAI?
Summary
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.
Severity ?
9.8 (Critical)
CWE
- n/a
Assigner
References
{
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"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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},
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"timestamp": "2026-04-01T18:28:31.287047Z",
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"cweId": "CWE-120",
"description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
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]
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CVE-2026-25834 (GCVE-0-2026-25834)
Vulnerability from nvd – Published: 2026-04-01 00:00 – Updated: 2026-04-01 18:54
VLAI?
Summary
Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.
Severity ?
6.5 (Medium)
CWE
- n/a
Assigner
References
{
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"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
"version": "3.1"
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"timestamp": "2026-04-01T18:53:56.370902Z",
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"cweId": "CWE-295",
"description": "CWE-295 Improper Certificate Validation",
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"type": "CWE"
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]
},
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"descriptions": [
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"cweId": "CWE-327",
"description": "CWE-327 Use of a Broken or Risky Cryptographic Algorithm",
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]
}
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CVE-2025-59438 (GCVE-0-2025-59438)
Vulnerability from nvd – Published: 2025-10-21 00:00 – Updated: 2025-10-21 16:09
VLAI?
Summary
Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.
Severity ?
5.3 (Medium)
CWE
- n/a
Assigner
References
{
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"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
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"scope": "UNCHANGED",
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"timestamp": "2025-10-21T16:06:28.899715Z",
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"url": "https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-10-invalid-padding-error/"
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CVE-2025-54764 (GCVE-0-2025-54764)
Vulnerability from nvd – Published: 2025-10-20 00:00 – Updated: 2025-10-21 13:55
VLAI?
Summary
Mbed TLS before 3.6.5 allows a local timing attack against certain RSA operations, and direct calls to mbedtls_mpi_mod_inv or mbedtls_mpi_gcd.
Severity ?
6.2 (Medium)
CWE
- n/a
Assigner
References
{
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"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
},
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CVE-2025-49087 (GCVE-0-2025-49087)
Vulnerability from nvd – Published: 2025-07-20 00:00 – Updated: 2025-07-21 20:37
VLAI?
Summary
In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows an attacker to recover the plaintext when PKCS#7 padding mode is used.
Severity ?
4 (Medium)
CWE
- CWE-385 - Covert Timing Channel
Assigner
References
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CVE-2025-47917 (GCVE-0-2025-47917)
Vulnerability from nvd – Published: 2025-07-20 00:00 – Updated: 2025-11-03 20:04
VLAI?
Summary
Mbed TLS before 3.6.4 allows a use-after-free in certain situations of applications that are developed in accordance with the documentation. The function mbedtls_x509_string_to_names() takes a head argument that is documented as an output argument. The documentation does not suggest that the function will free that pointer; however, the function does call mbedtls_asn1_free_named_data_list() on that argument, which performs a deep free(). As a result, application code that uses this function (relying only on documented behavior) is likely to still hold pointers to the memory blocks that were freed, resulting in a high risk of use-after-free or double-free. In particular, the two sample programs x509/cert_write and x509/cert_req are affected (use-after-free if the san string contains more than one DN).
Severity ?
8.9 (High)
CWE
- CWE-416 - Use After Free
Assigner
References
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CVE-2025-48965 (GCVE-0-2025-48965)
Vulnerability from nvd – Published: 2025-07-20 00:00 – Updated: 2025-11-03 20:04
VLAI?
Summary
Mbed TLS before 3.6.4 has a NULL pointer dereference because mbedtls_asn1_store_named_data can trigger conflicting data with val.p of NULL but val.len greater than zero.
Severity ?
4 (Medium)
CWE
- CWE-696 - Incorrect Behavior Order
Assigner
References
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CVE-2026-34876 (GCVE-0-2026-34876)
Vulnerability from cvelistv5 – Published: 2026-04-02 00:00 – Updated: 2026-04-02 15:54
VLAI?
Summary
An issue was discovered in Mbed TLS 3.x before 3.6.6. An out-of-bounds read vulnerability in mbedtls_ccm_finish() in library/ccm.c allows attackers to obtain adjacent CCM context data via invocation of the multipart CCM API with an oversized tag_len parameter. This is caused by missing validation of the tag_len parameter against the size of the internal 16-byte authentication buffer. The issue affects the public multipart CCM API in Mbed TLS 3.x, where mbedtls_ccm_finish() can be invoked directly by applications. In Mbed TLS 4.x versions prior to the fix, the same missing validation exists in the internal implementation; however, the function is not exposed as part of the public API. Exploitation requires application-level invocation of the multipart CCM API.
Severity ?
7.5 (High)
CWE
- n/a
Assigner
References
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CVE-2026-34877 (GCVE-0-2026-34877)
Vulnerability from cvelistv5 – Published: 2026-04-02 00:00 – Updated: 2026-04-02 17:52
VLAI?
Summary
An 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 structures allows an attacker who can modify the serialized structures to induce memory corruption, leading to arbitrary code execution. This is caused by Incorrect Use of Privileged APIs.
Severity ?
9.8 (Critical)
CWE
- n/a
Assigner
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"cveId": "CVE-2026-34877",
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CVE-2026-25835 (GCVE-0-2026-25835)
Vulnerability from cvelistv5 – Published: 2026-04-01 00:00 – Updated: 2026-04-01 20:07
VLAI?
Summary
Mbed TLS before 3.6.6 and TF-PSA-Crypto before 1.1.0 misuse seeds in a Pseudo-Random Number Generator (PRNG).
Severity ?
7.7 (High)
CWE
- n/a
Assigner
References
{
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CVE-2026-34871 (GCVE-0-2026-34871)
Vulnerability from cvelistv5 – Published: 2026-04-01 00:00 – Updated: 2026-04-01 20:04
VLAI?
Summary
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).
Severity ?
6.7 (Medium)
CWE
- n/a
Assigner
References
{
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"url": "https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-dev-random/"
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CVE-2026-34874 (GCVE-0-2026-34874)
Vulnerability from cvelistv5 – Published: 2026-04-01 00:00 – Updated: 2026-04-01 19:24
VLAI?
Summary
An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0.
Severity ?
7.5 (High)
CWE
- n/a
Assigner
References
{
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{
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{
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"integrityImpact": "NONE",
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"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"cweId": "CWE-476",
"description": "CWE-476 NULL Pointer Dereference",
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"type": "CWE"
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]
}
],
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CVE-2026-34873 (GCVE-0-2026-34873)
Vulnerability from cvelistv5 – Published: 2026-04-01 00:00 – Updated: 2026-04-02 16:24
VLAI?
Summary
An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1.3 session.
Severity ?
9.1 (Critical)
CWE
- n/a
Assigner
References
{
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{
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"description": "CWE-287 Improper Authentication",
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"type": "CWE"
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]
}
],
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],
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CVE-2025-66442 (GCVE-0-2025-66442)
Vulnerability from cvelistv5 – Published: 2026-04-01 00:00 – Updated: 2026-04-01 20:00
VLAI?
Summary
In Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) that only occurs with LLVM's select-optimize feature. TF-PSA-Crypto through 1.0.0 is also affected.
Severity ?
5.1 (Medium)
CWE
- n/a
Assigner
References
{
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{
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{
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"attackComplexity": "HIGH",
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"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
},
{
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"timestamp": "2026-04-01T19:59:38.178674Z",
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},
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"cweId": "CWE-385",
"description": "CWE-385 Covert Timing Channel",
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"type": "CWE"
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]
}
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"product": "n/a",
"vendor": "n/a",
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"description": "n/a",
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],
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"dateUpdated": "2026-04-01T19:28:05.685Z",
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"url": "https://github.com/Mbed-TLS/mbedtls/releases"
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"url": "https://github.com/Mbed-TLS/TF-PSA-Crypto/releases"
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CVE-2026-25834 (GCVE-0-2026-25834)
Vulnerability from cvelistv5 – Published: 2026-04-01 00:00 – Updated: 2026-04-01 18:54
VLAI?
Summary
Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.
Severity ?
6.5 (Medium)
CWE
- n/a
Assigner
References
{
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"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
"version": "3.1"
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},
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]
},
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"cweId": "CWE-327",
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"type": "CWE"
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]
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"url": "https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-sigalg-injection/"
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CVE-2026-34875 (GCVE-0-2026-34875)
Vulnerability from cvelistv5 – Published: 2026-04-01 00:00 – Updated: 2026-04-01 18:29
VLAI?
Summary
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.
Severity ?
9.8 (Critical)
CWE
- n/a
Assigner
References
{
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"attackComplexity": "LOW",
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"baseScore": 9.8,
"baseSeverity": "CRITICAL",
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CVE-2026-25833 (GCVE-0-2026-25833)
Vulnerability from cvelistv5 – Published: 2026-04-01 00:00 – Updated: 2026-04-01 19:21
VLAI?
Summary
Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509_inet_pton_ipv6() function
Severity ?
7.5 (High)
CWE
- n/a
Assigner
References
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CVE-2026-34872 (GCVE-0-2026-34872)
Vulnerability from cvelistv5 – Published: 2026-04-01 00:00 – Updated: 2026-04-01 19:52
VLAI?
Summary
An issue was discovered in Mbed TLS 3.5.x and 3.6.x through 3.6.5 and TF-PSA-Crypto 1.0. There is a lack of contributory behavior in FFDH due to improper input validation. Using finite-field Diffie-Hellman, the other party can force the shared secret into a small set of values (lack of contributory behavior). This is a problem for protocols that depend on contributory behavior (which is not the case for TLS). The attack can be carried by the peer, or depending on the protocol by an active network attacker (person in the middle).
Severity ?
9.1 (Critical)
CWE
- n/a
Assigner
References
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CVE-2025-59438 (GCVE-0-2025-59438)
Vulnerability from cvelistv5 – Published: 2025-10-21 00:00 – Updated: 2025-10-21 16:09
VLAI?
Summary
Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.
Severity ?
5.3 (Medium)
CWE
- n/a
Assigner
References
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CVE-2025-54764 (GCVE-0-2025-54764)
Vulnerability from cvelistv5 – Published: 2025-10-20 00:00 – Updated: 2025-10-21 13:55
VLAI?
Summary
Mbed TLS before 3.6.5 allows a local timing attack against certain RSA operations, and direct calls to mbedtls_mpi_mod_inv or mbedtls_mpi_gcd.
Severity ?
6.2 (Medium)
CWE
- n/a
Assigner
References
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CVE-2025-49087 (GCVE-0-2025-49087)
Vulnerability from cvelistv5 – Published: 2025-07-20 00:00 – Updated: 2025-07-21 20:37
VLAI?
Summary
In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows an attacker to recover the plaintext when PKCS#7 padding mode is used.
Severity ?
4 (Medium)
CWE
- CWE-385 - Covert Timing Channel
Assigner
References
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