Is CVE-2026-34582 in the CISA KEV catalog?

No. CVE-2026-34582 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-34582?

CVE-2026-34582 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2026-34582?

CVE-2026-34582 has an EPSS score of 0.23% (14th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-34582?

No published fix for CVE-2026-34582 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-34582

CRITICAL

9.1

CVSS v3

NVD

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.

CWE-841 CWE-166

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploit Intelligence

0.23%probability of exploitation in 30 days

14thpercentile

Low risk: more likely to be exploited than 14% of all known CVEs.

References

Vendor Advisory1

github.com

Other references3

Related Vulnerabilities

Other CWE-841 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-1667	High	7.5	1.2%	-	Fix
CVE-2022-2105	Critical	9.4	1.0%	-	Fix
CVE-2023-4181	Medium	5.4	1.0%	-	-
CVE-2022-2102	Critical	9.4	0.9%	-	Fix
CVE-2024-51738	High	8.1	0.6%	-	Fix
CVE-2024-37296	Medium	5.3	0.5%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.