Quick answers
- Is CVE-2026-103878 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103878 being exploited in the wild.
- How severe is CVE-2026-103878?
- Informational severity, published 2 October 2026.
- Which products and versions are affected?
- Apache Directory Ldap Api 2.1.0 before 2.1.9.
- Is there a fix for CVE-2026-103878?
- Yes: fixed in 2.1.9. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-103878 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-103878?
- Check whether you run Apache Directory Ldap Api at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 2.1.9
Technical details
When a StartTLS extended operation is issued after a Search request, data can be received in plaintext before the TLS handshake completes, violating the expectation of encryption. The vulnerability affects LDAP API versions 2.1.0 through 2.1.8 and is triggered by the specific sequence of Search followed by StartTLS operations. An attacker with network access can passively intercept unencrypted LDAP messages in this window.
Affected products
- Apache Directory LDAP API 2.1.0 before 2.1.9
Timeline
- 2026-10-02: disclosed