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CVE-2026-0930

Potential wolfSSHd Buffer out-of-bounds Read on Windows Handling Terminal Resize

Potential read out of bounds case with wolfSSHd on Windows while handling a terminal resize request. An authenticated user could trigger the out of bounds read after establishing a connection which would leak the adjacent stack memory to the pseudo-console output.

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssh Wolfssl
Products
Wolfssh Wolfssh
CVE-2009-4484

mysql: yaSSL certificate parsing buffer overflow (vulndisco)

Multiple stack-based buffer overflows in the CertDecoder::GetName function in src/asn.cpp in TaoCrypt in yaSSL before 1.9.9, as used in mysqld in MySQL 5.0.x before 5.0.90, MySQL 5.1.x before 5.1.43, MySQL 5.5.x through 5.5.0-m2, and other products, allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption and daemon crash) by establishing an SSL connection and sending an X.509 client certificate with a crafted name field, as demonstrated by mysql_overflow1.py and the vd_mysql5 module in VulnDisco Pack Professional 8.11. NOTE: this was originally reported for MySQL 5.0.51a.

CVSS 2.0 · 7.5 High EPSS 69.6% KEV · Not listed
Vendors
Canonical Debian Mariadb and 2 more
Products
Ubuntu Linux Debian Linux Mariadb and 2 more
CVE-2026-5187

Heap Out-of-Bounds Write in DecodeObjectId() in wolfSSL

Two potential heap out-of-bounds write locations existed in DecodeObjectId() in wolfcrypt/src/asn.c. First, a bounds check only validates one available slot before writing two OID arc values (out[0] and out[1]), enabling a 2-byte out-of-bounds write when outSz equals 1. Second, multiple callers pass sizeof(decOid) (64 bytes on 64-bit platforms) instead of the element count MAX_OID_SZ (32), causing the function to accept crafted OIDs with 33 or more arcs that write past the end of the allocated buffer.

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-3849

Buffer Overflow in HPKE via Oversized ECH Config

Stack Buffer Overflow in wc_HpkeLabeledExtract via Oversized ECH Config. A vulnerability existed in wolfSSL 5.8.4 ECH (Encrypted Client Hello) support, where a maliciously crafted ECH config could cause a stack buffer overflow on the client side, leading to potential remote execution and client program crash. This could be exploited by a malicious TLS server supporting ECH. Note that ECH is off by default, and is only enabled with enable-ech.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2025-13912

Potential non-constant time compiled code with Clang LLVM

Multiple constant-time implementations in wolfSSL before version 5.8.4 may be transformed into non-constant-time binary by LLVM optimizations, which can potentially result in observable timing discrepancies and lead to information disclosure through timing side-channel attacks.

CVSS 4.0 · 1 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2025-15346

wolfSSL Python library `CERT_REQUIRED` mode fails to enforce client certificate requirement

A vulnerability in the handling of verify_mode = CERT_REQUIRED in the wolfssl Python package (wolfssl-py) causes client certificate requirements to not be fully enforced.  Because the WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT flag was not included, the behavior effectively matched CERT_OPTIONAL: a peer certificate was verified if presented, but connections were incorrectly authenticated when no client certificate was provided.  This results in improper authentication, allowing attackers to bypass mutual TLS (mTLS) client authentication by omitting a client certificate during the TLS handshake.  The issue affects versions up to and including 5.8.2.

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2025-7395

Domain Name Validation Bypass with Apple Native Certificate Validation

A certificate verification error in wolfSSL when building with the WOLFSSL_SYS_CA_CERTS and WOLFSSL_APPLE_NATIVE_CERT_VALIDATION options results in the wolfSSL client failing to properly verify the server certificate's domain name, allowing any certificate issued by a trusted CA to be accepted regardless of the hostname.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2025-7844

wolfTPM library wrapper function `wolfTPM2_RsaKey_TpmToWolf` copies external data to a fixed-size stack buffer without length validation potentially causing stack-based buffer overflow

Exporting a TPM based RSA key larger than 2048 bits from the TPM could overrun a stack buffer if the default `MAX_RSA_KEY_BITS=2048` is used. If your TPM 2.0 module supports RSA key sizes larger than 2048 bit and your applications supports creating or importing an RSA private or public key larger than 2048 bits and your application calls `wolfTPM2_RsaKey_TpmToWolf` on that key, then a stack buffer could be overrun. If the `MAX_RSA_KEY_BITS` build-time macro is set correctly (RSA bits match what TPM hardware is capable of) for the hardware target, then a stack overrun is not possible.

CVSS 4.0 · 1 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolftpm
CVE-2026-3547

wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation

Out-of-bounds read in ALPN parsing due to incomplete validation. wolfSSL 5.8.4 and earlier contained an out-of-bounds read in ALPN handling when built with ALPN enabled (HAVE_ALPN / --enable-alpn). A crafted ALPN protocol list could trigger an out-of-bounds read, leading to a potential process crash (denial of service). Note that ALPN is disabled by default, but is enabled for these 3rd party compatibility features: enable-apachehttpd, enable-bind, enable-curl, enable-haproxy, enable-hitch, enable-lighty, enable-jni, enable-nginx, enable-quic.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-4395

Heap-based buffer overflow in wc_ecc_import_x963_ex KCAPI path

Heap-based buffer overflow in the KCAPI ECC code path of wc_ecc_import_x963_ex() in wolfSSL wolfcrypt allows a remote attacker to write attacker-controlled data past the bounds of the pubkey_raw buffer via a crafted oversized EC public key point. The WOLFSSL_KCAPI_ECC code path copies the input to key->pubkey_raw (132 bytes) using XMEMCPY without a bounds check, unlike the ATECC code path which includes a length validation. This can be triggered during TLS key exchange when a malicious peer sends a crafted ECPoint in ServerKeyExchange.

CVSS 4.0 · 1.3 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-3230

Improper key_share validation in TLS 1.3 HelloRetryRequest

Missing required cryptographic step in the TLS 1.3 client HelloRetryRequest handshake logic in wolfSSL could lead to a compromise in the confidentiality of TLS-protected communications via a crafted HelloRetryRequest followed by a ServerHello message that omits the required key_share extension, resulting in derivation of predictable traffic secrets from (EC)DHE shared secret. This issue does not affect the client's authentication of the server during TLS handshakes.

CVSS 4.0 · 1.2 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-3229

Integer Overflow in Certificate Chain Allocation

An integer overflow vulnerability existed in the static function wolfssl_add_to_chain, that caused heap corruption when certificate data was written out of bounds of an insufficiently sized certificate buffer. wolfssl_add_to_chain is called by these API: wolfSSL_CTX_add_extra_chain_cert, wolfSSL_CTX_add1_chain_cert, wolfSSL_add0_chain_cert. These API are enabled for 3rd party compatibility features: enable-opensslall, enable-opensslextra, enable-lighty, enable-stunnel, enable-nginx, enable-haproxy. This issue is not remotely exploitable, and would require that the application context loading certificates is compromised.

CVSS 4.0 · 1.2 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-3549

ECH parsing heap buffer overflow

Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-3579

Non-constant time multiplication subroutine __muldi3 on RISC-V RV32I

wolfSSL 5.8.4 on RISC-V RV32I architectures lacks a constant-time software implementation for 64-bit multiplication. The compiler-inserted __muldi3 subroutine executes in variable time based on operand values. This affects multiple SP math functions (sp_256_mul_9, sp_256_sqr_9, etc.), leading to a timing side-channel that may expose sensitive cryptographic data.

CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-3580

Compiler-induced timing leak in sp_256_get_entry_256_9 on RISC-V

In wolfSSL 5.8.4, constant-time masking logic in sp_256_get_entry_256_9 is optimized into conditional branches (bnez) by GCC when targeting RISC-V RV32I with -O3. This transformation breaks the side-channel resistance of ECC scalar multiplication, potentially allowing a local attacker to recover secret keys via timing analysis.

CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2024-1545

Fault Injection of RSA encryption in WolfCrypt

Fault Injection vulnerability in RsaPrivateDecryption function in wolfssl/wolfcrypt/src/rsa.c in WolfSSL wolfssl5.6.6 on Linux/Windows allows remote attacker co-resides in the same system with a victim process to disclose information and escalate privileges via Rowhammer fault injection to the RsaKey structure.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Linux Microsoft Wolfssl
Products
Linux Kernel Windows Wolfcrypt and 1 more
CVE-2024-1544

ECDSA nonce bias caused by truncation

Generating the ECDSA nonce k samples a random number r and then truncates this randomness with a modular reduction mod n where n is the order of the elliptic curve. Meaning k = r mod n. The division used during the reduction estimates a factor q_e by dividing the upper two digits (a digit having e.g. a size of 8 byte) of r by the upper digit of n and then decrements q_e in a loop until it has the correct size. Observing the number of times q_e is decremented through a control-flow revealing side-channel reveals a bias in the most significant bits of k. Depending on the curve this is either a negligible bias or a significant bias large enough to reconstruct k with lattice reduction methods. For SECP160R1, e.g., we find a bias of 15 bits.

CVSS 3.1 · 4.1 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2024-0901

SEGV and out of bounds memory read from malicious packet

Remotely executed SEGV and out of bounds read allows malicious packet sender to crash or cause an out of bounds read via sending a malformed packet with the correct length.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2025-12888

Constant Time Issue with Xtensa-based ESP32 and X22519

Vulnerability in X25519 constant-time cryptographic implementations due to timing side channels introduced by compiler optimizations and CPU architecture limitations, specifically with the Xtensa-based ESP32 chips. If targeting Xtensa it is recommended to use the low memory implementations of X25519, which is now turned on as the default for Xtensa.

CVSS 4.0 · 1 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2025-11936

Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 ClientHello

Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl