CVE-2026-88647

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-88647
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 17:17:17 UTC
Updated2026-10-19 16:17:08 UTC
DescriptionA hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a crafted certificate.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from ADP

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

EPSS: 0.002120000 probability, percentile 0.108160000 (date 2026-10-19)

Problem Types: CWE-297 | n/a | CWE-297 CWE-297 Improper Validation of Certificate with Host Mismatch

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
gitlab.com/gnutls/gnutls/-/issues/1802 [email protected] gitlab.com
gist.github.com/lkloliver/f98ec3de1a871fdfc02b70b8b9ba7642 [email protected] gist.github.com
github.com/lkloliver/poc/tree/main/CVE-2026-88647 MITRE github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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