Use After Free Affecting CESNET/libyang package, versions [,5.4.9)
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-UNMANAGED-CESNETLIBYANG-16965084
- published28 May 2026
- disclosed26 May 2026
- creditkevin-valerio
Introduced: 26 May 2026
NewCVE-2026-41401 (opens in a new tab)How to fix?
Upgrade CESNET/libyang to version 5.4.9 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free via the lyd_parser_set_data_flags function. An attacker can cause process crashes or potentially execute arbitrary code by submitting crafted YANG XML documents with specific metadata attributes to applications that parse untrusted XML data.