How severe is CVE-2026-32884?

CVE-2026-32884 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-32884 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-32884?

CVE-2026-32884 affects Botan Project Botan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-32884?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-32884 have an EU (EUVD) identifier?

Yes. CVE-2026-32884 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17212.

When was CVE-2026-32884 published?

CVE-2026-32884 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-32884

CVE-2026-32884 is a medium-severity vulnerability in Botan Project Botan with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-295.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17212
Weakness: CWE-295
Affected product: Botan Project Botan
Published: 2026-03-30
Last modified: 2026-06-17

Description

Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alternative name is defined in the end-entity certificate Botan would check that the CN was allowed by the DNS name constraints, even though this check is technically not required by RFC 5280. However this check failed to account for the possibility of a mixed-case CN. Thus a certificate with CN=Sub.EVIL.COM and no subject alternative name would bypasses an excludedSubtrees constraint for evil.com because the comparison is case-sensitive. This issue has been patched in version 3.11.0.

Frequently asked questions

What is CVE-2026-32884?: Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alternative name is defined in the end-entity certificate Botan would check that the CN was allowed by the DNS name constraints, even though this check is technically not required by RFC 5280. However this check failed to account for the possibility of a mixed-case CN. Thus a certificate with CN=Sub.EVIL.COM and no subject alternative name would bypasses an excludedSubtrees constraint for evil.com because the comparison is case-sensitive. This issue has been patched in version 3.11.0.
How severe is CVE-2026-32884?: CVE-2026-32884 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-32884 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32884?: CVE-2026-32884 affects Botan Project Botan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-32884?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-32884 have an EU (EUVD) identifier?: Yes. CVE-2026-32884 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17212.
When was CVE-2026-32884 published?: CVE-2026-32884 was published on 2026-03-30 and last updated on 2026-06-17.

References

https://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5

Affected products (1)

cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*

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