CVE-2026-1858
CVE-2026-1858 is a medium-severity vulnerability in Gnu Wget2 with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.
Key facts
- Severity: Medium (CVSS 3.x base score 4.8)
- EPSS exploit prediction: 0% (5th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-26285
- Weakness: CWE-20
- Affected product: Gnu Wget2
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-1858?
- 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.
- How severe is CVE-2026-1858?
- CVE-2026-1858 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2026-1858 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-1858?
- CVE-2026-1858 affects Gnu Wget2. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-1858?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-1858 have an EU (EUVD) identifier?
- Yes. CVE-2026-1858 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26285.
- When was CVE-2026-1858 published?
- CVE-2026-1858 was published on 2026-04-29 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:gnu:wget2:*:*:*:*:*:*:*:*
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