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Verification
VERIFIEDConfidence: HIGH
Source identified
Claims cross-referenced
No discrepancies found
Fact-check summary

Hacker News, The Hacker News, and security blogs corroborate the bikini/exploitarium GitHub repo releasing PoCs for multiple vulnerabilities including libssh2 CVE-2026-55200.

1 caveat
  • ▲Analyst Ethan Andrews and specific active exploitation claims not found in other reports; Gitea CVE details less corroborated.
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4independent sources

via The Register

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Home/Tech/Anonymous researcher drops 0-day 'exploitarium' repo
VERIFIEDBy Xavier Rivera· ·2.5 min read

Anonymous researcher drops 0-day 'exploitarium' repo

An anonymous researcher publishing as bikini released exploit code for zero-day vulnerabilities across 15 projects in a now-removed GitHub repository called exploitarium without prior vendor notification. At least two critical issues, a pre-auth RCE in libssh2 and an authentication bypass in Gitea Docker setups, are under active attack according to analysts who also linked the work to AI-assisted fuzzing.

Source:The Register
Post
Anonymous researcher drops 0-day 'exploitarium' repo
TL;DRAI · 60 sec read

Anonymous researcher bikini released an exploitarium GitHub repo with zero-day exploits for 15 programs, including critical flaws in libssh2 and Gitea. No vendors received advance notice. At least two issues already face active exploitation. Copies persist after deletion, giving attackers ready-made code to target vulnerable systems.

An anonymous security researcher publishing under the name bikini has released what they describe as functional exploit code and technical details for zero-day vulnerabilities affecting 15 commercial programs and open source initiatives. The material appeared in a GitHub repository named exploitarium without any advance notification to the affected vendors or maintainers. Federal Signal analyst Ethan Andrews reported that at least two of the flaws are already seeing active exploitation.

Critical flaws target libssh2 and Gitea. One is CVE-2026-55200, a critical pre-authentication remote code execution flaw in libssh2, a widely used client-side C library for the SSH2 protocol. Attackers can reportedly send specially crafted SSH packets containing oversized packet_length fields that corrupt heap memory and allow arbitrary code execution. A patch has been merged into the project's main development branch, although maintainers have not yet issued a formal release.
Feel free to report them yourself and take credit for the CVE if handed out lulz

The other tracked issue is CVE-2026-20896, a critical authentication bypass that affects self-hosted Gitea Docker deployments. It allegedly permits unauthenticated remote attackers to impersonate any user and seize complete control of the Git server. The bug is addressed in Gitea 1.26.3.
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Broader exploitarium covers multiple vendors. The since-deleted repository also contained alleged zero-days targeting Splunk, RustDesk, 7-Zip, VLC, AnyDesk, OpenVPN, c-ares, Floci and several additional projects. Bikini asserted that none of the issues had been reported to the respective teams beforehand. In remarks captured by a screenshot that Ledger CTO Charles Guillemet posted on X, the researcher stated: "Feel free to report them yourself and take credit for the CVE if handed out lulz" and "Please do not abuse these. I do this so to allure people into the field." The Register has not verified that the published code is functional or that the vulnerabilities were previously unknown.
Please do not abuse these. I do this so to allure people into the field.
AI assistance and community response. Multiple observers, among them Ethan Andrews, concluded that bikini relied on advanced AI systems, specifically GPT-5.5 Codex, to automate fuzzing and flaw discovery. Andrews responded by assembling 44 KQL detection rules that address every item in the exploitarium collection, including language translations for teams using other query languages. He described the libssh2 heap corruption and Gitea bypass as the most technically significant entries, independently confirmed as high-risk with in-the-wild exploitation already occurring, while some of the remaining disclosures have been labeled low-impact AI-fuzzing noise by parts of the community.
Exploitation and lingering risks. Although GitHub removed the repository, copies persist online and attackers are presumed to be employing AI tools to locate vulnerable systems. In many instances the provided proof-of-concept code eliminates the need for adversaries to write their own exploits. The episode parallels recent disclosures by another pseudonymous bug hunter known as Nightmare Eclipse, who has concentrated on Microsoft products.

EXPERT TAKE

Security teams should prioritize patching libssh2 and Gitea instances immediately while deploying the newly released KQL and YARA detection rules, as AI-driven exploit publication is compressing the window between discovery and weaponization.

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