01 Record

CVE-2026-34580

Botan has a certificate authentication bypass due to trust anchor confusion

CriticalPUBLISHEDCNA: GitHub_M

CNA base score9.3 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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02 Description

Botan has a certificate authentication bypass due to trust anchor confusion

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.45% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 39.0% of scored records. A rank, not a probability.

NVD base score

9.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Modified. NVD last modified this record on 2026-07-24.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-04-07 21:12Z6 MO AGO

Last updated

2026-07-15 01:04Z3 MO AGO

Reserved

2026-03-30

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

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

Weaknesses

CWE-295Improper Certificate ValidationBase

Data version

5.2

Document digest

dd3485f6db7bcfb3797536ace6bfd052a52c930bdd46699f304cdc482fd09d45

05 Affected products

VendorProductVersionsPlatforms

randombitbotan>= 3.11.0, < 3.11.1—

06 References

github.comhttps://github.com/randombit/botan/security/advisories/GHSA-v782-6fq4-q827x_refsource_CONFIRM
access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-34580vdb-entryx_refsource_REDHAT
bugzilla.redhat.comRHBZ#2456288https://bugzilla.redhat.com/show_bug.cgi?id=2456288issue-trackingx_refsource_REDHAT
security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34580.jsonx_sadp-csaf-vex