🛡️ CVE-2026-56017 on Ubuntu — libjavascript-minifier-xs-perl

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

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.

Distribution advisory

This page covers CVE-2026-56017 as tracked by Ubuntu, for the package libjavascript-minifier-xs-perl. No fixed version has been recorded for this distribution yet.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

UBUNTU-CVE-2026-56017 is classified as CWE-125: Out-of-bounds Read. The code reads past the limits of a buffer, exposing adjacent memory contents or crashing the process.

Affected software

UBUNTU-CVE-2026-56017 is recorded against 1 package.

libjavascript-minifier-xs-perl

Timeline and source

Published on 29 June 2026 and last revised on 1 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
lists.security.metacpan.org (Report)
metacpan.org (Report)
www.openwall.com (Report)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-06-29

Updated 2026-08-11

Modified 2026-07-01

Fix URL N/A

Affected Packages

Software	From version	Fixed in
libjavascript-minifier-xs-perl	—	—

References

REPORT https://ubuntu.com/security/CVE-2026-56017

REPORT https://www.cve.org/CVERecord?id=CVE-2026-56017

REPORT https://lists.security.metacpan.org/cve-announce/msg/41396063/

REPORT https://metacpan.org/release/GTERMARS/JavaScript-Minifier-XS-0.16/changes

REPORT http://www.openwall.com/lists/oss-security/2026/06/29/16

🔗 NVD 🔗 Mitre

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