CVE-2026-118650 labstack CVE debrief

Who should care

Defenders responsible for systems using github.com/labstack/echo/v4 and github.com/labstack/echo/v5 should assess exposure and prioritize remediation to prevent potential unauthorized access to statically-served paths.

Why it matters

Defenders should care about CVE-2026-118650 because it affects the security of statically-served paths in github.com/labstack/echo, potentially allowing unauthorized access. The vulnerability requires verification of affected systems and prioritization of remediation to prevent exploitation.

• Potential unauthorized access to statically-served paths
• Need to verify inventory of affected systems
• Prioritize remediation to prevent exploitation
• Monitor for suspicious activity related to statically-served paths

Technical summary

The github.com/labstack/echo package is vulnerable to a URL-encoded path bypass issue, affecting the route/group middleware guarding a statically-served path. This vulnerability is addressed in versions 4.16.0 and 5.4.0 for the v4 and v5 branches, respectively. The vulnerability requires verification of affected systems and prioritization of remediation to prevent exploitation. Defenders should prioritize assessing exposure and applying patches or mitigations to prevent potential unauthorized access to statically-served paths.

Defensive priority

Defenders should prioritize assessing exposure and applying patches or mitigations to prevent potential unauthorized access to statically-served paths.

Recommended defensive actions

• Assess exposure of statically-served paths in github.com/labstack/echo/v4 and github.com/labstack/echo/v5
• Apply patches or mitigations to prevent potential unauthorized access
• Verify inventory of affected systems and prioritize remediation
• Monitor for suspicious activity related to statically-served paths
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The vulnerability is described in the source item from osv_dev, which provides details about the URL-encoded path bypass issue in github.com/labstack/echo. The CVE Program and NVD records provide additional context.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.