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Public proof of conceptFix availableAwaiting NVD analysis

CVE-2026-118654

Echo static file middleware route protection bypass via encoded dot-dot traversal

A public proof of concept exists; no exploitation attested.

  • Published2026-10-28
  • Fixed in4.16.0
  • WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Echo's static file handlers can normalize dot segments after route matching and serve a file through a public static route even though the corresponding direct path is protected by route-level middleware. An unauthenticated attacker can read files that an application intended to protect with route-level middleware, when those files are also reachable through a static filesystem mount after path normalization. This vulnerability is the result of an incomplete fix for CVE-2026-55677. This issue is fixed in 4.16.0 and 5.4.0.

Timeline

dates in UTC
  1. 2026-10-2819:59CVE publishedCNA

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-118654?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-118654?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV
labstack/echo
BranchAffectedFixed in
4.16< 4.16.04.16.0
labstack/echo
BranchAffectedFixed in
5.4< 5.4.05.4.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • labstack echo
    Affected
    • = < 4.16.0no fix stated
    • = >= 5.0.0, < 5.4.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-10-28

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • github.com/labstack/echo/v4Echo:Goall versions · fixed in 4.16.0
  • golang-github-labstack-echoUbuntu:26.10all versions · no fixed version listed
  • golang-github-labstack-echoUbuntu:26.04:LTSall versions · no fixed version listed
  • golang-github-labstack-echoUbuntu:24.04:LTSall versions · no fixed version listed
  • golang-github-labstack-echoUbuntu:22.04:LTSall versions · no fixed version listedand 2 other packages
  • golang-github-labstack-echoDebian:14all versions · no fixed version listed
  • golang-github-labstack-echoDebian:13all versions · no fixed version listed
  • golang-github-labstack-echoDebian:12all versions · no fixed version listed

1 more package range on OSV.dev

Full record on NVD

Fix

  1. Update labstack/echo to 4.16.0

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2026-10-28
Last Modified
2026-11-02
NVD status
Undergoing Analysis
GitHub Advisory
GHSA-3pmx-cf9f-34xr

Frequently asked questions

What is CVE-2026-118654?

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Echo's static file handlers can normalize dot segments after route matching and serve a file through a public static route even though the corresponding direct path is protected by route-level middleware. An unauthenticated attacker can read files that an application intended to protect with route-level middleware, when those files are also reachable through a static filesystem mount after path normalization. This vulnerability is the result of an incomplete fix for CVE-2026-55677. This issue is fixed in 4.16.0 and 5.4.0.

Is CVE-2026-118654 actively exploited?

A proof-of-concept exploit exists for CVE-2026-118654, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-118654?

CVE-2026-118654 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

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