What is CVE-2015-7826?

CVE-2015-7826 is a critical-severity vulnerability in Botan Project, classified under Improper Certificate Validation. CVSS score: 9.8/10. Published 2017-04-10.

How severe is CVE-2015-7826?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Botan Project

CVE-2015-7826

botan 1.11.x before 1.11.22 improperly handles wildcard matching against hostnames, which might allow remote attackers to have unspecified impact via a valid X.509 certificate, as demonstrated by accepting *.example.com as a match for bar.foo.example.com.

Vulnerability class: Improper Certificate Validation

Published 2017-04-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.6th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Botan Project

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

bugzilla.redhat.com/show_bug.cgi (VDB Entry, Third Party Advisory, Issue Tracking)
botan.randombit.net/security.html (Vendor Advisory)

Frequently asked questions

What is CVE-2015-7826?: CVE-2015-7826 is a critical-severity vulnerability in Botan Project, classified under Improper Certificate Validation. CVSS score: 9.8/10. Published 2017-04-10.
How severe is CVE-2015-7826?: Critical severity. CVSS v3 base score is 9.8 out of 10.