wget2 Improper Certificate Validation

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-1858
StatePUBLISHED
Assignertenable
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-29 21:16:20 UTC
Updated2026-05-05 02:47:29 UTC
Descriptionwget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.

Risk And Classification

Primary CVSS: v3.1 4.8 MEDIUM from [email protected]

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

EPSS: 0.000130000 probability, percentile 0.019980000 (date 2026-05-04)

Problem Types: CWE-20 | CWE-20 CWE-20 Improper input validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNACVSS4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Gnu Wget2 All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gnu Wget2 affected 2.2.1 semver Not specified

References

ReferenceSourceLinkTags
www.tenable.com/security/research/tra-2026-37 [email protected] www.tenable.com Exploit, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Ireneusz Pastusiak with Tenable (en)

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