CVE-2024-34702

Botan is a C++ cryptography library. X.509 certificates can identify elliptic curves using either an object identifier or using explicit encoding of the parameters. Prior to 3.5.0 and 2.19.5, checking name constraints in X.509 certificates is quadratic in the number of names and name constraints. An attacker who presented a certificate chain which contained a very large number of names in the SubjectAlternativeName, signed by a CA certificate which contained a large number of name constraints, could cause a denial of service. The problem has been addressed in Botan 3.5.0 and a partial backport has also been applied and is included in Botan 2.19.5.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
botan	25.04 plucky	Not affected
	24.10 oracular	Fixed 2.19.3+dfsg-1ubuntu2.1
	24.04 LTS noble	Fixed 2.19.3+dfsg-1ubuntu2+esm1
	23.10 mantic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Fixed 2.19.1+dfsg-2ubuntu1+esm1
	20.04 LTS focal	Ignored changes too intrusive
	18.04 LTS bionic	Ignored changes too intrusive

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Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

USN-7586-1
Botan vulnerabilities
23 June 2025