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TI-2026-01531 Aliases CVE-2026-1858GHSA-9h5h-4q77-cphm

wget2 Improper Certificate Validation

Priority LOW 21CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

wget2 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00155 4th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GNUwget2up to 2.2.1—No fix listedCNA
  • wget2 VendorGNU Affected up to 2.2.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gnu:wget2:*:*:*:*:*:*:*:*up to 2.2.1VulnerableGNU
  • cpe:2.3:a:gnu:wget2:*:*:*:*:*:*:*:* Versions up to 2.2.1 Vulnerable ·GNU

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-1858
  2. 2026-10-03 Alias added: GHSA-9h5h-4q77-cphm

References

Exploit 1

  • TI-2025-42648 Wget2: arbitrary file write via metalink path traversal in gnu wget2 CVSS 3.1CRITICAL 9.8
  • TI-2025-42649 Wget2: gnu wget2: memory corruption and crash via filename sanitization logic with attacker-controlled urls CVSS 3.1HIGH 8.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences