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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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:64693a2dab836868b9aa0ce69a58f3e69298c8ddcb78ad24d8b98715c4bb305a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"libyang","vendor":"libyang","versions":[{"lessThan":"5.4.3","status":"affected","version":"0","versionType":"custom"},{"status":"unaffected","version":"5.4.3","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-416","description":"Use After Free","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"https://github.com/CESNET/libyang/commit/6b5ed47ee674fbe86b31bbebc4ff26889aeff38c","tags":["patch"],"url":"https://github.com/CESNET/libyang/commit/6b5ed47ee674fbe86b31bbebc4ff26889aeff38c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/references/1
{"name":"GHSA Advisory GHSA-9f49-8x56-jmjc","tags":["vendor-advisory"],"url":"https://github.com/CESNET/libyang/security/advisories/GHSA-9f49-8x56-jmjc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/CESNET/libyang/security/advisories/GHSA-9f49-8x56-jmjc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/adp/0/references/0
{"name":"Anthropic CVD Finding ANT-2026-TZQ1KH7E","tags":["third-party-advisory"],"url":"https://red.anthropic.com/2026/cvd/findings/ANT-2026-TZQ1KH7E"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://red.anthropic.com/2026/cvd/findings/ANT-2026-TZQ1KH7E"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/adp/0/references/1
{"name":"VulnCheck Advisory: libyang - Heap Use-After-Free Write in XML Metadata Parsing","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/libyang-heap-use-after-free-write-in-xml-metadata-parsing"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7c60cd3b19e2255afe89e679c70650641a0f7efa538f3a6a131928a88189743c · sha256:0a5e2361d040b165… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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