CVE-2026-81535 wolfSSH SSH client accepts unsolicited forwarded-tcpip channel opens without an authorization check

In wolfSSH through 1.5.0 built with --enable-fwd, DoChannelOpen in src/internal.c gates only direct-tcpip channel opens with the forwarding policy callback. forwarded-tcpip opens are admitted without an authorization check and are not capped in number, allowing a malicious SSH peer to make an...

CVE-2026-81535 wolfSSH SSH client accepts unsolicited forwarded-tcpip channel opens without an authorization check

In wolfSSH through 1.5.0 built with --enable-fwd, DoChannelOpen in src/internal.c gates only direct-tcpip channel opens with the forwarding policy callback. forwarded-tcpip opens are admitted without an authorization check and are not capped in number, allowing a malicious SSH peer to make an...

CVE-2026-81535

The wolfSSH SSH client (versions through 1.5.0 built with --enable-fwd) is vulnerable to an authorization bypass in the DoChannelOpen() function located in src/internal.c. The software only validates direct-tcpip channel opens against the forwarding policy, while forwarded-tcpip opens are admitte...

CVE-2026-81535

In wolfSSH through 1.5.0 built with --enable-fwd, DoChannelOpen in src/internal.c gates only direct-tcpip channel opens with the forwarding policy callback. forwarded-tcpip opens are admitted without an authorization check and are not capped in number, allowing a malicious SSH peer to make an...

CVE-2026-16516 wolfSSH ECDSA host key curve not validated against negotiated algorithm

wolfSSH does not validate that the ECDSA curve identifier in a KEXDHREPLY host key blob matches the algorithm negotiated during key exchange. In ParseECCPubKey src/internal.c, the blob's algorithm string is used to derive the curve via NameToId/wcPrimeForId without checking against the negotiated...

CVE-2026-16516 wolfSSH ECDSA host key curve not validated against negotiated algorithm

wolfSSH does not validate that the ECDSA curve identifier in a KEXDHREPLY host key blob matches the algorithm negotiated during key exchange. In ParseECCPubKey src/internal.c, the blob's algorithm string is used to derive the curve via NameToId/wcPrimeForId without checking against the negotiated...

CVE-2026-16516

The wolfSSH library contains a vulnerability in the ParseECCPubKey() function (located in src/internal.c) where it fails to validate that the ECDSA curve identifier in a KEXDH_REPLY host key blob matches the negotiated algorithm during the key exchange. Specifically, the software uses the blob's ...

EUVD-2026-94161

wolfSSH does not validate that the ECDSA curve identifier in a KEXDHREPLY host key blob matches the algorithm negotiated during key exchange. In ParseECCPubKey src/internal.c, the blob's algorithm string is used to derive the curve via NameToId/wcPrimeForId without checking against the negotiated...

CVE-2026-16516 wolfSSH ECDSA host key curve not validated against negotiated algorithm

wolfSSH does not validate that the ECDSA curve identifier in a KEXDHREPLY host key blob matches the algorithm negotiated during key exchange. In ParseECCPubKey src/internal.c, the blob's algorithm string is used to derive the curve via NameToId/wcPrimeForId without checking against the negotiated...

CVE-2026-16516

wolfSSH does not validate that the ECDSA curve identifier in a KEXDHREPLY host key blob matches the algorithm negotiated during key exchange. In ParseECCPubKey src/internal.c, the blob's algorithm string is used to derive the curve via NameToId/wcPrimeForId without checking against the negotiated...

PT-2026-107389

Name of the Vulnerable Software and Affected Versions wolfSSL wolfSSH versions 1.4.11 through 1.5.0 Description An unsigned integer underflow occurs in the wstrncat function within src/port.c on non-Windows platforms. This issue allows an authenticated remote attacker to write a single null byte...

PT-2026-107390

Name of the Vulnerable Software and Affected Versions wolfSSL wolfSSH versions 1.2.0 through 1.5.0 Description In the src/internal.c file, the server incorrectly accepts server-to-client Diffie-Hellman group exchange messages, specifically SSH MSG KEX DH GEX GROUP 31 and SSH MSG KEX DH GEX REPLY...

PT-2026-107386

Name of the Vulnerable Software and Affected Versions wolfSSH affected versions not specified Description wolfSSH fails to validate that the ECDSA curve identifier in a KEXDH REPLY host key blob matches the algorithm negotiated during key exchange. In the ParseECCPubKey function, the blob's...

PT-2026-107387

Name of the Vulnerable Software and Affected Versions wolfSSH versions prior to 1.5.1 Description When built with the --enable-fwd flag, the DoChannelOpen function in src/internal.c only applies the forwarding policy callback to direct-tcpip channel opens. Consequently, forwarded-tcpip opens are...

K000163564: Curl vulnerabilities CVE-2025-13034 and CVE-2025-10966

Security Advisory Description CVE-2025-13034 When using CURLOPTPINNEDPUBLICKEY option with libcurl or --pinnedpubkey with the curl tool, curl should check the public key of the server certificate to verify the peer. This check was skipped in a certain condition that would then make curl allow the...

wolfssh:fuzz_server: Null-dereference READ in ubsan_GetStackTrace

Detailed Report: https://oss-fuzz.com/testcase?key=6413439160614912 Project: wolfssh Fuzzing Engine: libFuzzer Fuzz Target: fuzzserver Job Type: libfuzzerubsanwolfssh Platform Id: linux Crash Type: Null-dereference READ Crash Address: 0x000000000000 Crash State: ubsanGetStackTrace Sanitizer:...

JLSEC-2026-424 curl's code for managing SSH connections when SFTP was done using the wolfSSH powered backend was...

curl's code for managing SSH connections when SFTP was done using the wolfSSH powered backend was flawed and missed host verification mechanisms. This prevents curl from detecting MITM attackers and more...

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...

wolfSSH 安全漏洞

WolfSSH is a small, fast, and portable SSH implementation of wolfSSL, including support for SCP and SFTP. WolfSSH has security vulnerabilities, particularly an out-of-bounds read vulnerability when handling terminal resizing requests, which may lead to authenticated users leaking adjacent stack...

curl: Curl missing SFTP host verification with wolfSSH backend

curl's code for managing SSH connections when SFTP was done using the wolfSSH powered backend was flawed and missed host verification mechanisms. As the wolfSSH backend was documented as incomplete and fail tests, it is not expected that many users execute this code in production...