Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten, the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path in which two distinct datastructures that were submitted by the same remote client are compared using _.isEqual. For example, if a client submits data that are stored in a database, and the same client can later submit another datastructure that is then compared to the data that were saved in the database previously, OR if a client submits a single request, but its data are parsed twice, creating two non-identical but equivalent datastructures that are then compared. Exceptions originating from the call to _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed in 1.13.8.

tenable TNS-2026-22: [R1] Security Center Version 6.9.0 Fixes Multiple Vulnerabilities

According to the versions of the python-sqlalchemy packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual     functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker     could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input     must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth     limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten,     the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure     that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to
    _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path     in which two distinct datastructures that were submitted by the same remote client are compared using
    _.isEqual. For example, if a client submits data that are stored in a database, and the same client can     later submit another datastructure that is then compared to the data that were saved in the database     previously, OR if a client submits a single request, but its data are parsed twice, creating two non-     identical but equivalent datastructures that are then compared. Exceptions originating from the call to
    _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed     in 1.13.8.(CVE-2026-27601)

Tenable has extracted the preceding description block directly from the EulerOS python-sqlalchemy security advisory.

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

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21448-1 advisory.

    - CVE-2025-7783: form-data: unsafe `Math.random()` function is used to select a boundary value for     multipart       form-encoded data (bsc#1246822).
    - CVE-2026-12143: form-data: CRLF injection via unescaped multipart field names and filenames     (bsc#1272310).
    - CVE-2026-13149: brace-expansion: `expand()` function exhibits exponential-time complexity when     processing       non-expanding `{}` brace groups (bsc#1269927).
    - CVE-2026-13311: shell-quote: quadratic complexity in `parse()` function when processing specially     crafted strings       (bsc#1269359).
    - CVE-2026-13676: fast-uri: host-based policy bypass due to failure to canonicalize Unicode/IDN hostnames     for       HTTP-family URLs (bsc#1269595).
    - CVE-2026-27601: underscore: DoS via stack overflow due to missing depth limits in `_.flatten` and     `_.isEqual`       functions (bsc#1259169).
    - CVE-2026-40181: react-router: open redirect to an external domain due to path values starting with `//`     being       reinterpreted as protocol-relative URLs (bsc#1272311).
    - CVE-2026-49356: @babel/core: arbitrary file read via `sourceMappingURL` comment (bsc#1272317).
    - CVE-2026-53550: js-yaml: quadratic complexity in merge-key processing when processing a crafted YAML     document       (bsc#1268851).
    - CVE-2026-53632: launch-editor: NTLMv2 hash disclosure via UNC path handling on Windows (bsc#1272319).
    - CVE-2026-54466: websocket-driver: message corruption via abuse of protocol length headers (bsc#1272312).
    - CVE-2026-54490: websocket-driver: resource limit bypass via message compression (bsc#1272313).
    - CVE-2026-55602: http-proxy-middleware: Host-header-driven backend routing bypass via `router` host+path     substring       matching (bsc#1272318).

Tenable has extracted the preceding description block directly from the SUSE 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.

  - Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual     functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker     could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input     must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth     limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten,     the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure     that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to
    _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path     in which two distinct datastructures that were submitted by the same remote client are compared using
    _.isEqual. For example, if a client submits data that are stored in a database, and the same client can     later submit another datastructure that is then compared to the data that were saved in the database     previously, OR if a client submits a single request, but its data are parsed twice, creating two non-     identical but equivalent datastructures that are then compared. Exceptions originating from the call to
    _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed     in 1.13.8. (CVE-2026-27601)

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

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

  - Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual
    functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker
    could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input
    must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth
    limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten,
    the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure
    that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to
    _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path
    in which two distinct datastructures that were submitted by the same remote client are compared using
    _.isEqual. For example, if a client submits data that are stored in a database, and the same client can
    later submit another datastructure that is then compared to the data that were saved in the database
    previously, OR if a client submits a single request, but its data are parsed twice, creating two non-
    identical but equivalent datastructures that are then compared. Exceptions originating from the call to
    _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed
    in 1.13.8. (CVE-2026-27601)

ID	Name	Product	Family	Type	Severity
333487	EulerOS 2.0 SP11 : python-sqlalchemy (EulerOS-SA-2026-3097)	Nessus	Huawei Local Security Checks	Local	high
333462	EulerOS 2.0 SP11 : python-sqlalchemy (EulerOS-SA-2026-3151)	Nessus	Huawei Local Security Checks	Local	high
330583	openSUSE 16 Security Update : agama-web-ui (openSUSE-SU-2026:21448-1)	Nessus	SuSE Local Security Checks	Local	critical
300943	Linux Distros Unpatched Vulnerability : CVE-2026-27601	Nessus	Misc.	Local	high
438099	SCA: security update for underscore (GHSA-qpx9-hpmf-5gmw)	Tenable Cloud Security	SCA Checks	Local	high
438099	SCA: security update for underscore (GHSA-qpx9-hpmf-5gmw)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

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