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Vulnerabilities

Vulnerability · AZL-87354

CVE-2026-41401 affecting package libyang for versions less than 2.1.148-3

Published May 26, 2026 · catalog updated Oct 30, 2026 · affecting package libyang for

Last checked Oct 31, 2026, 12 days ago.

Open the advisory

Exploitation likelihood is not on this record for AZL-87354. A missing EPSS score is not a low risk. Compare affecting package libyang for with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (affecting package libyang for).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Not established
Affected products
Azure Linux:3 libyang

libyang before 5.4.3 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Azure Linux:3 libyang0 → 2.1.148-3

How to fix AZL-87354

  • Upgrade

    AZL-87354 lists a fix boundary at 2.1.148-3. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 2.1.148-3

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for AZL-87354. A missing EPSS score is not a low risk. Compare affecting package libyang for with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0 → 2.1.148-3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 26, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    libyang before 5.4.3 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 e

  2. Oct 30, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libyang fixed in 2.1.148-3

  3. Oct 30, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libyang fixed in 2.1.148-3

  4. Oct 30, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    libyang before 5.4.3 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 e

Sources

References

Freshness

Last verified in this catalog Oct 30, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • OpenSSF OSV / OSV ScannerOct 31, 2026