CVE-2026-34877

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.

Database specific

{
    "cna_assigner": "mitre",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34877.json"
}

References

Affected packages

Git / github.com/Mbed-TLS/mbedtls

Affected ranges

Type

GIT

Repo

https://github.com/Mbed-TLS/mbedtls

Events

Introduced

4197f0e28e15c42e907f873eea292fac31bfa7e6

Fixed

0bebf8b8c7f07abe3571ded48a11aa907a1ffb20

Database specific

Show details

{
    "cpe": "cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE",
    "extracted_events": [
        {
            "introduced": "2.19.0"
        },
        {
            "fixed": "3.6.6"
        }
    ]
}

Affected versions

mbedtls-2.*

mbedtls-2.19.0

mbedtls-2.19.0d2

mbedtls-2.19.1

mbedtls-2.20.0

mbedtls-2.20.0d0

mbedtls-2.21.0

mbedtls-2.22.0d0

mbedtls-2.24.0

mbedtls-2.26.0

v2.*

v2.24.0

v2.26.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34877.json"

Git / github.com/mbed-tls/mbedtls

Affected ranges

Type

GIT

Repo

https://github.com/mbed-tls/mbedtls

Events

Introduced

ec4044008d2d069da38288bc76b0fee34ec78646

Last affected

ec4044008d2d069da38288bc76b0fee34ec78646

Database specific

Show details

{
    "cpe": "cpe:2.3:a:trustedfirmware:mbed_tls:4.0.0:*:*:*:*:*:*:*",
    "source": "CPE_STRING",
    "extracted_events": [
        {
            "introduced": "4.0.0"
        },
        {
            "last_affected": "4.0.0"
        }
    ]
}

Affected versions

4.*

4.0.0

mbedtls-4.*

mbedtls-4.0.0

v4.*

v4.0.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34877.json"