CVE-2026-47389

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, when using Ruby versions older than 3.4, PrivateAddressCheck.privateaddress? returns false for IPv4-mapped IPv6 addresses ::ffff:a.b.c.d corresponding to some private IPv4 addresses,...

CVE-2026-47389 Mastodon: SSRF protection bypass on older Ruby versions

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, when using Ruby versions older than 3.4, PrivateAddressCheck.privateaddress? returns false for IPv4-mapped IPv6 addresses ::ffff:a.b.c.d corresponding to some private IPv4 addresses,...

ANT-2026-6DSMTXZ8 · mastodon · SSRF

ssrf high GHSA-crr4-7rm4-8gpw Severity Claude high · Security research firm high · Maintainer unknown Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Doyensec. ANT-2026-6DSMTXZ8: SSRF Bypass via IPv6 Unspecified...

CVE-2026-31943 LibreChat has SSRF protection bypass via IPv4-mapped IPv6 normalization in isPrivateIP

LibreChat is a ChatGPT clone with additional features. Prior to version 0.8.3, isPrivateIP in packages/api/src/auth/domain.ts fails to detect IPv4-mapped IPv6 addresses in their hex-normalized form, allowing any authenticated user to bypass SSRF protection and make the server issue HTTP requests ...

CVE-2026-32019

OpenClaw versions prior to 2026.2.22 contain incomplete IPv4 special-use range validation in the isPrivateIpv4 function, allowing requests to RFC-reserved ranges to bypass SSRF policy checks. Attackers with network reachability to special-use IPv4 ranges can exploit webfetch functionality to acce...

GHSA-2XVJ-J3QH-X8C3 private_address_check contains race condition

The privateaddresscheck ruby gem before 0.5.0 is vulnerable to a time-of-check time-of-use TOCTOU race condition due to the address the socket uses not being checked. DNS entries with a TTL of 0 can trigger this case where the initial resolution is a public address but the subsequent resolution i...

private_address_check ruby gem competition condition vulnerability

privateaddresscheck ruby gem is a Ruby-based checking tool for server-side request forgery attacks. A contention condition vulnerability exists in the privateaddresscheck ruby gem that stems from the program failing to detect the address used by a socket. No detailed vulnerability details are...

private_address_check ruby gem server-side request forgery vulnerability

privateaddresscheck ruby gem is a Ruby-based checking tool for server-side request forgery attacks. A server-side request forgery vulnerability exists in versions of the privateaddresscheck ruby gem prior to 0.4.1. An attacker can exploit this vulnerability to bypass blacklists and perform...

private_address_check ruby gem security restriction bypass vulnerability

privateaddresscheck ruby gem is a Ruby-based checking tool for server-side request forgery attacks. A security restriction bypass vulnerability exists in the privateaddresscheck ruby gem prior to version 0.4.0, which stems from the program's use of Ruby's Resolv.getaddresses method. An attacker...

CVE-2017-0909

The privateaddresscheck ruby gem before 0.4.1 is vulnerable to a bypass due to an incomplete blacklist of common private/local network addresses used to prevent server-side request forgery...

CVE-2017-0909

The privateaddresscheck ruby gem before 0.4.1 is vulnerable to a bypass due to an incomplete blacklist of common private/local network addresses used to prevent server-side request forgery...