CVE-2026-10098 OCSP CertID serial-number length-confusion in wolfSSL_OCSP_resp_find_status
An attacker can spoof OCSP revocation status by exploiting a serial number length confusion, bypassing certificate validation checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-10098?
CVE-2026-10098 is a medium-severity vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OCSP CertID serial-number length-confusion in wolfSSL_OCSP_resp_find_status allows a same-issuer SingleResponse whose serial is a prefix of the target serial to be reported as the revocation status of a different certificate. The lookup compared serial-number bytes without first requiring the two serial numbers to be of equal length, so a SingleResponse for one certificate (same issuer) whose serial is a prefix of the target's serial would match, returning the wrong certificate's status. The fix requires the serial lengths to be equal before comparing the serial bytes.
Weakness: CWE-295
Which versions are affected by CVE-2026-10098?
It affects 1 product.
Products include Wolfssl Wolfssl.
How do I fix CVE-2026-10098?
Apply the vendor's patch.
Is CVE-2026-10098 being exploited?
There is no known exploitation of CVE-2026-10098 in the wild and no public exploit code.
Other vulnerabilities in Wolfssl Wolfssl
Sources
Also known as DEBIAN-CVE-2026-10098, GHSA-xpv9-p7vg-qhrc, JLSEC-2026-694, UBUNTU-CVE-2026-10098.