At least two vulnerabilities are already under attack
Not everyone is willing to follow responsible disclosure of vulns. An anonymous researcher has dumped what they say is working exploit code for zero-day vulnerabilities across 15 software products and open source projects without notifying any vendors or maintainers prior to publishing - and attackers are already exploiting at least two of these.The first is CVE-2026-55200, a critical, pre-authentication remote code execution (RCE) vulnerability in libssh2, a popular client-side C library that implements the SSH2 protocol. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.A fix has been merged into the libssh2 mainline development source control branch, and maintainers are still preparing a libssh2 release containing the patch.
The second is CVE-2026-20896, a critical authentication bypass vulnerability affecting self-hosted Gitea Docker deployments that allows unauthenticated remote attackers to impersonate any user and fully take over the Git server. It’s fixed in Gitea 1.26.3.
The researcher, who goes by bikini, dropped the exploit code and vulnerability write-ups in a now-removed GitHub repository called exploitarium. They remind us of Nightmare Eclipse - the zero-day bug hunter who has been publishing Microsoft exploits over the past couple of months.Unlike Nightmare Eclipse, however, bikini doesn’t appear to hold a grudge against any one vendor, publishing purported vulnerabilities across multiple products and projects including libssh2, Splunk, RustDesk, 7-Zip, VLC, AnyDesk, OpenVPN, c-ares, Gitea, and Floci. Bikini claimed - and, to be clear, The Register has not verified these claims or that the code works - that none of the exploits in the repo have been reported. “Feel free to report them yourself and take credit for the CVE if handed out lulz,” the anonymous researcher wrote, as shown in this screenshot posted on X by Ledger CTO Charles Guillemet. “Please do not abuse these. I do this so to allure people into the field.”
