RUSTSEC-2026-0414

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Source

https://rustsec.org/advisories/RUSTSEC-2026-0414

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0414.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2026-0414

Published

2026-10-18T12:00:00Z

Modified

2026-10-28T09:00:02Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

Exponential event growth with `ENABLE_WIKILINKS`

Details

When Options::ENABLE_WIKILINKS is enabled, a wikilink with a pipe separator and empty display text, such as [[a|]], leaks its child node's sibling chain into the content that follows it. Each such link roughly doubles the number of events the parser yields for the rest of the document, so output grows exponentially with input size: 16 repetitions of [[a|]] (112 bytes) yield 327,676 events, where the fixed parser yields 65. A document of a few kilobytes is enough to exhaust memory in a process that collects the events or renders them to HTML.

Applications that parse untrusted Markdown with ENABLE_WIKILINKS set, including through Options::all(), are affected. The option is off by default. Parsing without it is not affected.

The flaw was fixed in #1102 and released in 0.13.5.

Database specific

{
    "license":  "CC0-1.0"
}

References

Affected packages

crates.io / pulldown-cmark

Package

Name: pulldown-cmark; View open source insights on deps.dev
Purl: pkg:cargo/pulldown-cmark

Affected ranges

Type: SEMVER
Events: Introduced

0.13.0

Fixed

0.13.5

Ecosystem specific

{
    "affected_functions":  null,
    "affects":  {
        "arch":  [],
        "functions":  [],
        "os":  []
    }
}