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Public proof of conceptFix available

CVE-2026-55677

A public proof of concept exists; no exploitation attested.

  • Published2026-06-26
  • 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 4.15.3 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.

Timeline

dates in UTC
  1. 2026-06-2617:16CVE publishedNVD

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-2026-55677?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-55677?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
3.3≤ 3.3.10no fix published
labstack/echo
BranchAffectedFixed in
4.15< 4.15.34.15.3
labstack/echo
BranchAffectedFixed in
5.2< 5.2.05.2.0

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
    • = < 4.15.3no fix stated
    • = >= 5.0.0, < 5.2.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-06-26

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

  • falcosidekick-uiChainguardall versions · fixed in 2.3.1-r3and 1 other package
  • github.com/labstack/echo/v4Root:Goall versions · fixed in v4.15.1-aikido.1
  • 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:25.10all 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

43 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-55677 Red Hat Product Security316 products fixed · 1 known affected

    github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy

    rhceph/rhceph-5-dashboard-rhel8 as a component of Red Hat Ceph Storage 5

  • RHSA-2026:91958 Red Hat Product Security33 products fixed

    Red Hat Security Advisory: osbuild-composer security update

  • RHSA-2026:90493 Red Hat Product Security20 products fixed

    Red Hat Security Advisory: osbuild-composer security update

  • RHSA-2026:90363 Red Hat Product Security29 products fixed

    Red Hat Security Advisory: osbuild-composer security update

  • RHSA-2026:69293 Red Hat Product Security33 products fixed

    Red Hat Security Advisory: osbuild-composer security update

  • RHSA-2026:67148 Red Hat Product Security33 products fixed

    Red Hat Security Advisory: osbuild-composer security update

12 more advisories

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2026:91958 · 33 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  2. Vendor fix Red Hat Product Security RHSA-2026:61314 · 8 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2026:60391 · 4 productsBefore you apply this update, make sure all previously released errata that are relevant to your system are applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security RHSA-2026:53530 · 4 productsFor more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.16/html/multicluster_global_hub/index
  5. Vendor fix Red Hat Product Security RHSA-2026:52946 · 4 productsFor more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.17/html/multicluster_global_hub/index
  6. Vendor fix Red Hat Product Security RHSA-2026:44622 · 4 productsFor more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.15/html/multicluster_global_hub/index

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:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2026-06-26
Last Modified
2026-10-25
NVD status
Deferred
GitHub Advisory
GHSA-vfp3-v2gw-7wfq

Frequently asked questions

What is CVE-2026-55677?

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.

Is CVE-2026-55677 actively exploited?

A proof-of-concept exploit exists for CVE-2026-55677, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-55677?

CVE-2026-55677 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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