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.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:69293 advisory.

    A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild     under the hood. Besides building images for local usage, it can also upload images directly to cloud.  It     is compatible with composer-cli and cockpit-composer clients.

    Security Fix(es):

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass     (CVE-2026-27136)

    * golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting     (CVE-2026-25681)

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree     rendering (CVE-2026-42502)

    * github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage:
    go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers     (CVE-2026-41178)

    * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1846:11 advisory.

    * crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec     (CVE-2025-22866)
      * crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation     (CVE-2026-32281)
      * net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)
      * mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)
      * github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage:
    go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers     (CVE-2026-41178)
      * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-664320 advisory.

    [176-1.0.3]
    - Fix CVE-2026-41178, CVE-2026-55677, CVE-2026-25681, CVE-2026-27136, CVE-2026-42502, CVE-2026-39821

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:67148 advisory.

    * crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec     (CVE-2025-22866)

    * crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation     (CVE-2026-32281)

    * net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)

    * mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)

    * github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage:
    go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers     (CVE-2026-41178)

    * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:67148 advisory.

    * crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec     (CVE-2025-22866)
      * crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation     (CVE-2026-32281)
      * net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)
      * mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)
      * github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage:
    go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers     (CVE-2026-41178)
      * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:67148 advisory.

    A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild     under the hood. Besides building images for local usage, it can also upload images directly to cloud.  It     is compatible with composer-cli and cockpit-composer clients.

    Security Fix(es):

    * crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec     (CVE-2025-22866)

    * crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation     (CVE-2026-32281)

    * net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)

    * mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)

    * github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage:
    go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers     (CVE-2026-41178)

    * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:66432 advisory.

    * golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect     Punycode label processing (CVE-2026-39821)

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass     (CVE-2026-27136)

    * golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting     (CVE-2026-25681)

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree     rendering (CVE-2026-42502)

    * github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage:
    go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers     (CVE-2026-41178)

    * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:66432 advisory.

    A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild     under the hood. Besides building images for local usage, it can also upload images directly to cloud.  It     is compatible with composer-cli and cockpit-composer clients.

    Security Fix(es):

    * golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect     Punycode label processing (CVE-2026-39821)

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass     (CVE-2026-27136)

    * golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting     (CVE-2026-25681)

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree     rendering (CVE-2026-42502)

    * github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage:
    go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers     (CVE-2026-41178)

    * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:63134 advisory.

    A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild     under the hood. Besides building images for local usage, it can also upload images directly to cloud.  It     is compatible with composer-cli and cockpit-composer clients.

    Security Fix(es):

    * golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect     Punycode label processing (CVE-2026-39821)

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass     (CVE-2026-27136)

    * golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting     (CVE-2026-25681)

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree     rendering (CVE-2026-42502)

    * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:61585 advisory.

    A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild     under the hood. Besides building images for local usage, it can also upload images directly to cloud.  It     is compatible with composer-cli and cockpit-composer clients.

    Security Fix(es):

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass     (CVE-2026-27136)

    * golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting     (CVE-2026-25681)

    * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree     rendering (CVE-2026-42502)

    * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-55677)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:57541 advisory.

    A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild     under the hood. Besides building images for local usage, it can also upload images directly to cloud.  It     is compatible with composer-cli and cockpit-composer clients.

    Security Fix(es):

    * golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect     Punycode label processing (CVE-2026-39821)

    * github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy     (CVE-2026-55677)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-55677)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
348689	RHEL 9 : osbuild-composer (RHSA-2026:69293)	Nessus	Red Hat Local Security Checks	Local	high
346250	MiracleLinux 8 : osbuild-composer-101.5-3.el8_10.ML.1 (AXSA:2026-1846:11)	Nessus	Miracle Linux Local Security Checks	Local	high
345987	Oracle Linux 10 : ELSA-2026-66432-0: / osbuild-composer (ELSA-2026-664320)	Nessus	Oracle Linux Local Security Checks	Local	high
345869	RockyLinux 8 : osbuild-composer (RLSA-2026:67148)	Nessus	Rocky Linux Local Security Checks	Local	high
345615	AlmaLinux 8 : osbuild-composer (ALSA-2026:67148)	Nessus	Alma Linux Local Security Checks	Local	high
345582	RHEL 8 : osbuild-composer (RHSA-2026:67148)	Nessus	Red Hat Local Security Checks	Local	high
344832	RockyLinux 10 : osbuild-composer (RLSA-2026:66432)	Nessus	Rocky Linux Local Security Checks	Local	high
344773	RHEL 10 : osbuild-composer (RHSA-2026:66432)	Nessus	Red Hat Local Security Checks	Local	high
342665	RHEL 10 : osbuild-composer (RHSA-2026:63134)	Nessus	Red Hat Local Security Checks	Local	high
342031	RHEL 9 : osbuild-composer (RHSA-2026:61585)	Nessus	Red Hat Local Security Checks	Local	high
446272	SCA: security update for github.com/labstack/echo/v4, github.com/labstack/echo/v5 (GHSA-vfp3-v2gw-7wfq)	Tenable Cloud Security	SCA Checks	Local	high
446272	SCA: security update for github.com/labstack/echo/v4, github.com/labstack/echo/v5 (GHSA-vfp3-v2gw-7wfq)	Tenable Self-Hosted Container Security	SCA Checks	Local	high
338333	RHEL 9 : osbuild-composer (RHSA-2026:57541)	Nessus	Red Hat Local Security Checks	Local	high
323662	Linux Distros Unpatched Vulnerability : CVE-2026-55677	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-55677

high

Tenable Plugins

high

high

high

high

high

high

high

high

high

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high