Bug 2493622 (CVE-2026-55677)

Summary: CVE-2026-55677 github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: amctagga, aoconnor, asyoung, bniver, dfreiber, dkeler, drow, flucifre, gmeno, gparvin, groman, jburrell, jhollowa, jsamir, jsherril, kaycoth, kgaikwad, lchilton, mbenjamin, mhackett, mkleinhe, prichard, rhaigner, rhel-process-autobot, rochandr, sfeifer, sostapov, sthirugn, suppawar, thason, vereddy, vkumar, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Echo, a Go web framework. An attacker can exploit a disagreement in URL path decoding between the router and the static file handler. The router processes raw encoded paths, while the static file handler unescapes encoded forward slashes. This allows an attacker to bypass route-level access controls, leading to unauthorized information disclosure by reading static files.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2506241, 2506242, 2506243, 2506261, 2506262, 2506263, 2506264, 2506265    
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Description OSIDB Bzimport 2026-06-26 17:02:08 UTC 
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.
Comment 5 errata-xmlrpc 2026-08-20 14:34:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:57541 https://access.redhat.com/errata/RHSA-2026:57541