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CVE-2026-34877

Medium priority
Needs evaluation

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...

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-34876

Medium priority
Needs evaluation

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...

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-34873

Medium priority
Needs evaluation

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.

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-34872

Medium priority
Needs evaluation

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...

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2025-66442

Medium priority
Needs evaluation

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.

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-34874

Medium priority
Needs evaluation

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.

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-34871

Medium priority
Needs evaluation

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).

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-25835

Medium priority
Needs evaluation

Mbed TLS before 3.6.6 and TF-PSA-Crypto before 1.1.0 misuse seeds in a Pseudo-Random Number Generator (PRNG).

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-25833

Medium priority
Needs evaluation

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

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-34875

Medium priority
Needs evaluation

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.

1 affected package

mbedtls

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
mbedtls Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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