Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Eclipse Leshan's org.eclipse.leshan:leshan-core is vulnerable to XML External Entity (XXE) attacks in DDFFileParser and DefaultDDFFileValidator, affecting versions below 1.5.0 and from 2.0.0-M1 up to but not including 2.0.0-M13. Exploitation requires the application to parse untrusted DDF files, such as ones supplied by external users, and this can let an attacker read or process data the application should not expose. Upgrade to version 1.5.0 or 2.0.0-M13. The source gives no simple workaround beyond writing a custom parser with a hardened DocumentBuilderFactory.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.5 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0069, the 53rd percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:18 UTC First seen by agentprime
- 31 Oct 2026, 14:18 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-wc9j-gc65-3cm7
- OSV: GHSA-wc9j-gc65-3cm7
- github.com/eclipse-leshan/leshan/security/advisories/GHSA-wc9j-gc65-3cm7
- nvd.nist.gov/vuln/detail/CVE-2023-41034
- github.com/eclipse-leshan/leshan/commit/29577d2879ba8e7674c3b216a7f01193fc7ae013
- github.com/eclipse-leshan/leshan/commit/4d3e63ac271a817f81fba3e3229c519af7a3049c
- github.com/eclipse-leshan/leshan
- github.com/eclipse-leshan/leshan/wiki/Adding-new-objects#the-lwm2m-model
- owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing