CVE-2026-87862

Publication date 14 October 2026

Last updated 3 November 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Why is this CVE low priority?

Upstream defined this as low severity

Learn more about Ubuntu priority

Status

Show unmaintained releases

Package	Ubuntu Release	Status
curl	26.10 stonking	Fixed in 8.20.0-2ubuntu11.1
	26.04 LTS resolute	Fixed in 8.18.0-1ubuntu2.8
	24.04 LTS noble	Fixed in 8.5.0-2ubuntu10.16
	22.04 LTS jammy	Fixed in 7.81.0-1ubuntu1.30
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

charlescochran

Jammy and noble are affected because CVE-2024-9681.patch backports the upstream change that introduced this flaw.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
curl	Upstream: a1614c3

Severity score breakdown

CVSS version: CVSS v3.0

Base score 8.1 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	8.1 · High
Exploitability score	-
Impact score	-

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

References

Related Ubuntu Security Notices (USN)

USN-8927-1
curl vulnerabilities
14 October 2026

USN-8932-1
curl vulnerabilities
14 October 2026

USN-8927-2
curl vulnerabilities
19 October 2026