Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-46348— Mastodon: SSRF Bypass via IPv6 Unspecified Address (::)

Quick assessment

Affected
mastodon mastodon
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mastodon是Mastodon组织的一款去中心化社交网络服务器软件。 Mastodon 4.5.10之前版本、4.4.17之前版本和4.3.23之前版本存在服务端请求伪造漏洞，该漏洞源于禁止的IP地址范围缺少可访问本地IP地址的地址范围，可能导致攻击者使用受影响范围内的IP地址使Mastodon对回环接口发起HTTP请求，从而访问私有资源和服务。

AI Predicted 6.5 Difficulty: Easy EPSS 0.41% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
mastodon mastodon >= 4.5.0-beta.1, < 4.5.10 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-46348

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Mastodon: SSRF Bypass via IPv6 Unspecified Address (::)
Source: CVE Program / CVE List V5
Vulnerability Description
Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, the list of disallowed IP address ranges was lacking an IP address range that can be used to reach local IP addresses. An attacker can use an IP address in the affected range to make Mastodon perform HTTP requests against loopback interfaces, potentially allowing access to otherwise private resources and services. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Mastodon 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mastodon是Mastodon组织的一款去中心化社交网络服务器软件。 Mastodon 4.5.10之前版本、4.4.17之前版本和4.3.23之前版本存在服务端请求伪造漏洞，该漏洞源于禁止的IP地址范围缺少可访问本地IP地址的地址范围，可能导致攻击者使用受影响范围内的IP地址使Mastodon对回环接口发起HTTP请求，从而访问私有资源和服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mastodon mastodon >= 4.5.0-beta.1, < 4.5.10 -

II. Public POCs for CVE-2026-46348

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-46348

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-46348 (1)

Same Patch Batch · mastodon · 2026-06-24 · 6 CVEs total

CVE-2026-47389 8.6 HIGH Mastodon: SSRF protection bypass on older Ruby versions
CVE-2026-50129 7.5 HIGH Mastodon: Persistent anonymous DoS via unhandled NoMethodError in MATH_TRANSFORMER
CVE-2026-48028 6.5 MEDIUM Mastodon: Removal of integrity-protected JSON entries from signed activities
CVE-2026-50128 5.3 MEDIUM Mastodon: Spoofing of attribution domains
CVE-2026-46349 5.3 MEDIUM Mastodon: LD-Signature Bypass via JSON-LD Named-Graph Restructuring

IV. Related Vulnerabilities

Same product: mastodon
Same vendor: mastodon
Same weakness: CWE-918

V. Comments for CVE-2026-46348

No comments yet

Leave a comment