CVE-2026-41401
CVE-2026-41401 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- CVSS v4: 7.1
- EPSS exploit prediction: 1% (40th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-31832
- Weakness: CWE-416
- Published:
- Last modified:
Description
libyang before 5.2.6 contains a heap use-after-free write vulnerability in lyd_parser_set_data_flags that incorrectly updates metadata list pointers when freeing non-head default metadata entries. Attackers can trigger this vulnerability by submitting crafted YANG XML documents with specific metadata attributes to applications parsing untrusted XML data, causing process crashes or potential code execution.
Frequently asked questions
- What is CVE-2026-41401?
- libyang before 5.2.6 contains a heap use-after-free write vulnerability in lyd_parser_set_data_flags that incorrectly updates metadata list pointers when freeing non-head default metadata entries. Attackers can trigger this vulnerability by submitting crafted YANG XML documents with specific metadata attributes to applications parsing untrusted XML data, causing process crashes or potential code execution.
- How severe is CVE-2026-41401?
- CVE-2026-41401 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-41401 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-41401?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-41401 have an EU (EUVD) identifier?
- Yes. CVE-2026-41401 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31832.
- When was CVE-2026-41401 published?
- CVE-2026-41401 was published on 2026-05-26 and last updated on 2026-06-17.
References
- https://github.com/CESNET/libyang/commit/6b5ed47ee674fbe86b31bbebc4ff26889aeff38c
- https://github.com/CESNET/libyang/security/advisories/GHSA-9f49-8x56-jmjc
- https://red.anthropic.com/2026/cvd/findings/ANT-2026-TZQ1KH7E
- https://www.vulncheck.com/advisories/libyang-heap-use-after-free-write-in-xml-metadata-parsing
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