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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-55677— Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files

Quick assessment

Affected
labstack echo
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

labstack echo是labstack个人开发者开源的一款高性能Web框架。 labstack echo 4.15.3之前版本和5.0.0及以上5.2.0之前版本存在路径遍历漏洞，该漏洞源于路由器和静态文件处理程序对URL路径解码的不一致，可能导致攻击者绕过路由级访问控制并未授权读取静态文件。

CVSS 7.5 · High EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1078.001 · Default Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
labstack echo < 4.15.3 affected
>= 5.0.0, < 5.2.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-55677

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files
Source: CVE Program / CVE List V5
Vulnerability Description
Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, Echo's router and static file handler disagree on URL path decoding. The router matches routes using the raw encoded path (preserving %2F as-is), while StaticDirectoryHandler unescapes %2F to / before resolving filesystem paths. This allows an attacker to bypass route-level access controls and read static files without authorization. This vulnerability is fixed in 4.15.3 and 5.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
labstack echo 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
labstack echo是labstack个人开发者开源的一款高性能Web框架。 labstack echo 4.15.3之前版本和5.0.0及以上5.2.0之前版本存在路径遍历漏洞，该漏洞源于路由器和静态文件处理程序对URL路径解码的不一致，可能导致攻击者绕过路由级访问控制并未授权读取静态文件。
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
labstack echo < 4.15.3 -

II. Public POCs for CVE-2026-55677

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6941 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-55677

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-55677 (1)

IV. Related Vulnerabilities

Same product: echo
Same vendor: labstack
Same weakness: CWE-22

V. Comments for CVE-2026-55677

No comments yet

Leave a comment