CVE-2026-56018 Affecting libjavascript-minifier-xs-perl package, versions <0.16-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-LIBJAVASCRIPTMINIFIERXSPERL-17682861
- published30 Jun 2026
- disclosed29 Jun 2026
Introduced: 29 Jun 2026
CVE-2026-56018 (opens in a new tab)How to fix?
Upgrade Debian:unstable libjavascript-minifier-xs-perl to version 0.16-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libjavascript-minifier-xs-perl package and not the libjavascript-minifier-xs-perl package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
JavaScript::Minifier::XS versions before 0.16 for Perl leak memory on every call to minify(), allowing unbounded memory growth.
In JsMinify (XS.xs) the cleanup frees only the NodeSet structures and never the per-token contents buffers allocated in JsSetNodeContents; JsDiscardNode unlinks nodes without freeing their contents. Each token's contents buffer is therefore leaked on every call, and the two early returns taken when the node list is empty leak the whole NodeSet.
A long-lived process that minifies repeatedly, such as an asset pipeline or a server-side minifier endpoint, grows in memory without bound until it exhausts available memory and is killed, causing denial of service.