CVE-2026-39908 OpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source
Remote attackers can capture NTLMv2 hashes by configuring a malicious UNC path proxy source, enabling credential theft or relay attacks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39908?
CVE-2026-39908 is a high-severity vulnerability in openbullet2, published on 8 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OpenBullet2 through version 0.3.2 on Windows contains a credential disclosure vulnerability that allows remote attackers to capture the NTLMv2 hash of the process user by configuring a job proxy source with a UNC path pointing to an attacker-controlled server. When the job starts, the application attempts to load proxies from the UNC path, triggering an SMB authentication attempt that discloses the NTLMv2 hash, which can then be relayed or cracked offline.
Weakness: CWE-522
Which versions are affected by CVE-2026-39908?
How do I fix CVE-2026-39908?
No fix has been published for CVE-2026-39908 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-39908 being exploited?
There is no known exploitation of CVE-2026-39908 in the wild and no public exploit code.
Sources
Also known as GHSA-489c-3g86-35rh.