JLSEC-2026-426 When using `CURLOPT_PINNEDPUBLICKEY` option with libcurl or `--pinnedpubkey` with the curl tool,curl...

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 connection without performing the proper chec...

JLSEC-2026-401

A use after free vulnerability exists in curl 7.87.0. Curl can be asked to tunnel virtually all protocols it supports through an HTTP proxy. HTTP proxies can and often do deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocat...

JLSEC-2026-387

An information disclosure vulnerability exists in curl 7.65.0 to 7.82.0 are vulnerable that by using an IPv6 address that was in the connection pool but with a different zone id it could reuse a connection instead...

JLSEC-2026-428 When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a...

When an OAuth2 bearer token is used for an HTTPS transfer, and that transfer performs a cross-protocol redirect to a second URL that uses an IMAP, LDAP, POP3 or SMTP scheme, curl might wrongly pass on the bearer token to the new target host...

JLSEC-2026-406

A path traversal vulnerability exists in curl 8.0.0 SFTP implementation causes the tilde character to be wrongly replaced when used as a prefix in the first path element, in addition to its intended use as the first element to indicate a path relative to the user's home directory. Attackers can...

JLSEC-2026-433 libcurl supports *pinning* of the server certificate public key for HTTPS transfers

libcurl supports pinning of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC...

CVE-2026-44427

creationtimestamp| type| source ---|---|--- 2026-05-04 12:25:03+00:00| published-proof-of-concept| https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6...

USN-8227-1: curl vulnerabilities

It was discovered that curl incorrectly reused non-TLS connections when TLS was required in some STARTTLS configurations. A remote attacker could possibly use this issue to obtain sensitive information. CVE-2026-4873 It was discovered that curl incorrectly reused certain HTTP Negotiate connection...

CVE-2026-6526

A flaw was found in Wireshark, a network protocol analyzer. By processing a specially crafted Real-Time Streaming Protocol RTSP packet, a remote attacker could cause the Wireshark application to crash, leading to a denial of service. This vulnerability affects the RTSP protocol dissector...

CVE-2026-5408

A flaw was found in Wireshark. A remote attacker could exploit a vulnerability in the BT-DHT protocol dissector, leading to a crash. This denial of service DoS vulnerability could prevent the application from processing network traffic, impacting its availability. Mitigation To mitigate this...

OpenSSH: OpenSSH: Privilege escalation via scp legacy protocol when not preserving file mode

A flaw was found in OpenSSH. When the scp command is used by a root user to download a file with the legacy protocol option -O and without preserving original file permissions -p, the downloaded file can be installed with elevated privileges setuid or setgid. This unexpected behavior could allow ...

CVE-2026-5406

A flaw was found in Wireshark. A remote attacker could exploit this vulnerability by crafting and sending malicious FC-SWILS protocol data. This would cause the FC-SWILS protocol dissector to crash, leading to a denial of service DoS for the affected system. Mitigation To mitigate this issue, avo...

CVE-2026-6538

A flaw was found in Wireshark. A remote attacker could exploit a crash in the BEEP Blocks Extensible Exchange Protocol dissector by crafting a malicious BEEP packet. This vulnerability leads to a Denial of Service DoS, causing Wireshark to become unresponsive. Mitigation To mitigate this issue,...

OpenSSH: OpenSSH: Privilege escalation via scp legacy protocol when not preserving file mode

A flaw was found in OpenSSH. When the scp command is used by a root user to download a file with the legacy protocol option -O and without preserving original file permissions -p, the downloaded file can be installed with elevated privileges setuid or setgid. This unexpected behavior could allow ...

CVE-2026-6536

A flaw was found in Wireshark. A remote attacker could exploit this vulnerability by sending a specially crafted DLMS/COSEM protocol packet. This could lead to an infinite loop in the DLMS/COSEM protocol dissector, resulting in a Denial of Service DoS for the affected system. Mitigation To mitiga...

CVE-2026-6537

A flaw was found in Wireshark. A remote attacker could exploit a vulnerability in the ZigBee protocol dissector by crafting a malicious packet. This could lead to a crash of the Wireshark application, resulting in a denial of service DoS for the user. Mitigation To mitigate this issue, users can...

CVE-2026-6531

A flaw was found in Wireshark. The SANE Scanner Access Now Easy protocol dissector contains an infinite loop vulnerability. A local user processing specially crafted SANE protocol traffic, such as opening a malicious capture file, can trigger this flaw, leading to a denial of service DoS in...

CVE-2026-6522

A flaw was found in Wireshark. The RPKI-Router protocol dissector contains an infinite loop. A remote attacker could exploit this by crafting a malicious RPKI-Router packet, leading to a denial of service DoS condition, making the Wireshark application unresponsive. Mitigation To reduce exposure,...

CVE-2026-5653

A flaw was found in Wireshark. A remote attacker could exploit a vulnerability in the DCP-ETSI protocol dissector, which is responsible for analyzing network traffic, to cause a crash. This could lead to a denial of service DoS, making the application unavailable to users. Mitigation To reduce th...

CVE-2026-5655

A flaw was found in Wireshark. A local user could be tricked into opening a specially crafted capture file containing Session Description Protocol SDP data. Processing this malicious data could lead to a crash in the SDP protocol dissector, resulting in a denial of service for the application...