Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
VOLERION
Volerion Security Research

NOT DEFERRED DATABASE

VULNERABILITIES

CVE-2026-87862 Details

Description

Importing a `includeSubDomains` parent HSTS entry before a longer-lived child entry, silently drops the child. Consequently, when the parent expires, the child's valid HSTS policy is lost, causing curl to issue unencrypted HTTP requests rather than upgrading to HTTPS.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://hackerone.com/reports/3972357 CISA-ADP
https://curl.se/docs/CVE-2026-87862.html curl
https://curl.se/docs/CVE-2026-87862.json curl
https://hackerone.com/reports/3972357 curl

Weakness Enumeration

CWE-IDCWE NameSource
CWE-201Insertion of Sensitive Information Into Sent DataCISA-ADP

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-87862
NVD Published Date:
Oct 20, 2026
NVD Last Modified:
Oct 30, 2026
Source:
curl
CVE-2026-87862 Details - Not Deferred