Quick answers
- Is CVE-2026-75805 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-75805 being exploited in the wild.
- How severe is CVE-2026-75805?
- Medium severity, with a CVSS score of 5.3, published 29 September 2026.
- Which products and versions are affected?
- OpenSSL <UNKNOWN>.
- Is there a fix for CVE-2026-75805?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-75805 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-75805?
- Check whether you run OpenSSL 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.
Technical details
The vulnerability is a NULL pointer dereference (CWE-476) in OpenSSL's CMP protocol implementation when handling revocation responses. When a client revokes a certificate via PKCS#10 CSR, it sends no issuer name or serial number; if the server's response includes a crafted certificate identifier, the client attempts to compare it against uninitialized NULL pointers, causing a crash. The attack requires the attacker to be a malicious CMP server or man-in-the-middle with knowledge of the message protection secret; clients using certificate or issuer/serial number identification are unaffected.
Affected products
- OpenSSL OpenSSL <UNKNOWN>
Timeline
- 2026-09-29: disclosed