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,...

CVE-2026-47389

Mastodon vulnerability CVE-2026-47389 affects older Ruby runtimes (

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,...

EUVD-2026-38880

In the Linux kernel, the following vulnerability has been resolved: nexthop: fix IPv6 route referencing IPv4 nexthop syzbot reported a panic 1 2. When an IPv6 nexthop is replaced with an IPv4 nexthop, the hasv4 flag of all groups containing this nexthop is not updated. This is because...

CVE-2026-12760 Denial-of-Service Vulnerability via Malformed IPv4 Fragmentation Handling in TP-Link Tapo C200

A denial-of-service DoS vulnerability has been identified in Tapo C200 v3 in the network packet handling logic due to improper handling of IPv4 fragmented packets. An unauthenticated adjacent attacker can send crafted packets to cause excessive resource consumption, leading to instability of the...

CVE-2026-53944

Affected software: Ghost CMS (Node.js) versions 6.0.9 through 6.21.1. Vulnerability: When Ghost makes an external request, an IPv6 literal can map to a private IPv4 address, bypassing the internal IP filter and potentially reaching internal services. Root cause: IP-filter bypass via IPv6-to-IPv4 ...

CVE-2026-53944

Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, when making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address. This vulnerability is fixed in...

CVE-2026-53070

In the Linux kernel, the following vulnerability has been resolved: sctp: disable BH before calling udptunnelxmitskb udptunnelxmitskb / udptunnel6xmitskb are expected to run with BH disabled. After commit 6f1a9140ecda "add xmit recursion limit to tunnel xmit functions", on the path:...

CVE-2026-53070 sctp: disable BH before calling udp_tunnel_xmit_skb()

In the Linux kernel, the following vulnerability has been resolved: sctp: disable BH before calling udptunnelxmitskb udptunnelxmitskb / udptunnel6xmitskb are expected to run with BH disabled. After commit 6f1a9140ecda "add xmit recursion limit to tunnel xmit functions", on the path:...

CVE-2026-53012

CVE-2026-53012 affects the Linux kernel: when an IPv6 nexthop is replaced with an IPv4 nexthop, the has_v4 flag in groups containing that nexthop is not updated. The reverse direction (AF_INET6 to AF_INET) is missed, enabling a stale has_v4=false to bypass fib6_check_nexthop and may cause a NULL ...

AZL-90549 CVE-2026-52921 affecting package kernel for versions less than 6.6.143.1-1

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: stop hash: range iteration at end The following hash set variants: hash:ip,mark hash:ip,port hash:ip,port,ip hash:ip,port,net iterate IPv4 ranges with a 32-bit iterator. The iterator must stop once the last...

UBUNTU-CVE-2026-52921

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: stop hash: range iteration at end The following hash set variants: hash:ip,mark hash:ip,port hash:ip,port,ip hash:ip,port,net iterate IPv4 ranges with a 32-bit iterator. The iterator must stop once the last...

CVE-2026-52921

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: stop hash: range iteration at end The following hash set variants: hash:ip,mark hash:ip,port hash:ip,port,ip hash:ip,port,net iterate IPv4 ranges with a 32-bit iterator. The iterator must stop once the last...

CVE-2026-52921

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: stop hash: range iteration at end The following hash set variants: hash:ip,mark hash:ip,port hash:ip,port,ip hash:ip,port,net iterate IPv4 ranges with a 32-bit iterator. The iterator must stop once the last...

kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err()

A flaw was found in the Linux kernel's IPv6 tunnel implementation. A remote attacker could exploit this flaw by sending malicious ICMPv6 error messages to cause a stack-based buffer overflow in the kernel's IPv4-over-IPv6 tunnel error handling code. This could result in a kernel crash denial of...

PT-2026-52079

Name of the Vulnerable Software and Affected Versions Mastodon versions prior to 4.5.10 Mastodon versions prior to 4.4.17 Mastodon versions prior to 4.3.23 Description When using Ruby versions older than 3.4, the PrivateAddressCheck.private address? function incorrectly returns false for...

CVE-2026-56266

CVE-2026-56266 affects Crawl4AI prior to 0.8.7. The vulnerability is a server-side request forgery in the /crawl, /crawl/stream, /md, and /llm endpoints that fetch arbitrary user‑supplied URLs without validation. Unauthenticated attackers can bypass the internal-address blocklist using IPv6‑mappe...

CVE-2026-56266 Crawl4AI - Server-Side Request Forgery via Direct Crawl Endpoints

Crawl4AI before 0.8.7 contains a server-side request forgery vulnerability in the /crawl, /crawl/stream, /md, and /llm endpoints that fetch arbitrary user-supplied URLs without validation. Unauthenticated attackers can bypass the internal-address blocklist using IPv6-mapped IPv4 addresses to reac...

CVE-2026-56266 Crawl4AI - Server-Side Request Forgery via Direct Crawl Endpoints

Crawl4AI before 0.8.7 contains a server-side request forgery vulnerability in the /crawl, /crawl/stream, /md, and /llm endpoints that fetch arbitrary user-supplied URLs without validation. Unauthenticated attackers can bypass the internal-address blocklist using IPv6-mapped IPv4 addresses to reac...

Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms

Summary The remediation shipped in mailpit v1.29.2 for GHSA-mpf7-p9x7-96r3 CVE-2026-27808 is incomplete. The tools.IsInternalIP deny-list relies on Go's stdlib classification helpers IsLoopback, IsPrivate, IsLinkLocalUnicast, IsLinkLocalMulticast, IsUnspecified, IsMulticast plus an inline CGNAT...