Vulnerability-Lookup

OPENSUSE-SU-2026:20528-1

Vulnerability from csaf_opensuse - Published: 2026-04-14 11:18 - Updated: 2026-09-17 17:30

Summary

Security update for Botan

Severity

Critical

Notes

Title of the patch: Security update for Botan

Description of the patch: This update for Botan fixes the following issues: - CVE-2026-34582: Fixed a client authentication bypass in TLS 1.3 implementation (bsc#1261880)

Patchnames: openSUSE-Leap-16.0-551

CVE-2026-34582

9.1 (Critical)


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

Affected products

Recommended 17 products

Product	Version	Remediation
Unresolved product id: openSUSE Leap 16.0:Botan-0:3.7.1-160000.3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:Botan-0:3.7.1-160000.3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:Botan-0:3.7.1-160000.3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:Botan-0:3.7.1-160000.3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:Botan-doc-0:3.7.1-160000.3.1.noarch	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libbotan-3-7-0:3.7.1-160000.3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libbotan-3-7-0:3.7.1-160000.3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libbotan-3-7-0:3.7.1-160000.3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libbotan-3-7-0:3.7.1-160000.3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libbotan-devel-0:3.7.1-160000.3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libbotan-devel-0:3.7.1-160000.3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libbotan-devel-0:3.7.1-160000.3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:libbotan-devel-0:3.7.1-160000.3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:python3-botan-0:3.7.1-160000.3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:python3-botan-0:3.7.1-160000.3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:python3-botan-0:3.7.1-160000.3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:python3-botan-0:3.7.1-160000.3.1.x86_64	—	Vendor Fix

Threats

Impact critical

References

6 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://bugzilla.suse.com/1261880	self
https://www.suse.com/security/cve/CVE-2026-34582/	self
https://www.suse.com/security/cve/CVE-2026-34582	external
https://bugzilla.suse.com/1261880	external

JSON

To clipboard

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CVE-2026-34582 (GCVE-0-2026-34582)

Vulnerability from cvelistv5 – Published: 2026-04-07 21:13 – Updated: 2026-07-15 01:04

Title

Botan has a TLS 1.3 certificate authentication bypass

Summary

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.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

9.1 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-08 15:41 UTC

CWE

CWE-841 - Improper Enforcement of Behavioral Workflow
CWE-166 - Improper Handling of Missing Special Element

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/randombit/botan/security/advis…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-34582	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2456285	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

2 products

Vendor	Product	Version
randombit	botan	Affected: < 3.11.1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OPENSUSE-SU-2026:20528-1

CVE-2026-34582 (GCVE-0-2026-34582)

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Nomenclature

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