CVE•Published 2026-04-07•Modified 2026-07-24•1 article on news•4 live references•NVD data
CVE-2026-34582Botan_project · Botan
Vulnerability data via NVD (ingested)
CVSS v3.1
9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS percentile
14
Exploit Prediction Scoring System · top 86% of all CVEs
Weaknesses (CWE)
Description
Botan is a C++ cryptography library. Prior to version 3.11.1, the TLS 1.3 implementation allowed ApplicationData records to be processed prior to the Finished message being received. A server which is attempting to enforce client authentication via certificates can by bypassed by a client which entirely omits Certificate, CertificateVerify, and the Finished message and instead sends application data records. This vulnerability is fixed in 3.11.1.
Timeline
Published 2026-04-07
Modified 2026-07-24
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common). Live host counts are a Premium feature.
Shodan · vuln tag
vuln:CVE-2026-34582Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Botan Project Botan"All exposed Botan Project Botan instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Botan"HTTP body or banner mentions "Botan" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-34582Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-34582Censys host search filtered to this CVE id.
grep.app
CVE-2026-34582Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-34582GitHub code search for direct mentions.
Google dork
"CVE-2026-34582" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.