JavaScript::Minifier::XS versions before 0.16 for Perl crash with a NULL pointer dereference when the first meaningful token of the input is a slash. The regexp versus division disambiguator in JsTokenizeString (XS.xs) inspects the previous token's last byte to choose between a regexp literal and a division operator. When a slash is the first meaningful token, with the start of input or only whitespace and comments before it, there is no valid preceding token: the walk back over whitespace and comment nodes runs off the head of the node list to NULL, and the byte lookup reads through a NULL contents pointer at an underflowed length index. The following identifier check dereferences the same NULL pointer. The crash is reachable through the public minify() API, so input as small as a single slash byte crashes the calling process. A service that minifies untrusted or third-party JavaScript can be crashed by a remote request, causing denial of service.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-629b796808 advisory.

    0.16 bump - Fix CVE-2026-56017 and CVE-2026-56018

Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-634b594205 advisory.

    0.16 bump - Fix CVE-2026-56017 and CVE-2026-56018

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

  - JavaScript::Minifier::XS versions before 0.16 for Perl crash with a NULL pointer dereference when the     first meaningful token of the input is a slash. The regexp versus division disambiguator in     JsTokenizeString (XS.xs) inspects the previous token's last byte to choose between a regexp literal and a     division operator. When a slash is the first meaningful token, with the start of input or only whitespace     and comments before it, there is no valid preceding token: the walk back over whitespace and comment nodes     runs off the head of the node list to NULL, and the byte lookup reads through a NULL contents pointer at     an underflowed length index. The following identifier check dereferences the same NULL pointer. The crash     is reachable through the public minify() API, so input as small as a single slash byte crashes the calling     process. A service that minifies untrusted or third-party JavaScript can be crashed by a remote request,     causing denial of service. (CVE-2026-56017)

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

ID	Name	Product	Family	Severity
325611	Fedora 43 : perl-JavaScript-Minifier-XS (2026-629b796808)	Nessus	Fedora Local Security Checks	high
325604	Fedora 44 : perl-JavaScript-Minifier-XS (2026-634b594205)	Nessus	Fedora Local Security Checks	high
323795	Linux Distros Unpatched Vulnerability : CVE-2026-56017	Nessus	Misc.	high

Detections

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CVE-2026-56017

high

Tenable Plugins

high

high

high