CVE-2026-87862

CVE-2026-87862 · HSTS cache import drops longer-lived child

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

EPSS 0.3% · Fix available

Published: 2026-10-20T20:10:37.039Z
Updated: 2026-10-20T20:10:37.039Z

Stack: system

Affected products and versions

curl
Versions
- ≥ 8.22.0, ≤ 8.22.0: Affected (semver)
- ≥ 8.21.0, ≤ 8.21.0: Affected (semver)
- ≥ 8.20.0, ≤ 8.20.0: Affected (semver)
- ≥ 8.19.0, ≤ 8.19.0: Affected (semver)
- ≥ 8.18.0, ≤ 8.18.0: Affected (semver)
- ≥ 8.17.0, ≤ 8.17.0: Affected (semver)
- ≥ 8.16.0, ≤ 8.16.0: Affected (semver)
- ≥ 8.15.0, ≤ 8.15.0: Affected (semver)
- ≥ 8.14.1, ≤ 8.14.1: Affected (semver)
- ≥ 8.14.0, ≤ 8.14.0: Affected (semver)
- ≥ 8.13.0, ≤ 8.13.0: Affected (semver)
- ≥ 8.12.1, ≤ 8.12.1: Affected (semver)
- ≥ 8.12.0, ≤ 8.12.0: Affected (semver)
- ≥ 8.11.1, ≤ 8.11.1: Affected (semver)
- ≥ 8.11.0, ≤ 8.11.0: Affected (semver)
No fix published
curl Debian:13
Versions
- 8.14.1-2
- 8.14.1-2+deb13u1
- 8.14.1-2+deb13u2
- 8.14.1-2+deb13u2~bpo13+1
- 8.14.1-2+deb13u3
- 8.14.1-2+deb13u4
- 8.14.1-2+deb13u5
- 8.14.1-2+deb13u7
- 8.14.1-2+exp1
- 8.15.0-1
- 8.15.0-1~bpo13+1
- 8.15.0-1~exp1
- 8.15.0~rc1-1exp1
- 8.15.0~rc2-1~exp1
- 8.15.0~rc3-1~exp1
- 8.16.0-1
- 8.16.0-1+exp1
- 8.16.0-1~bpo13+1
- 8.16.0-2
- 8.16.0-3
- 8.16.0-4
- 8.16.0-4~bpo13+1
- 8.16.0~rc1-1~exp1
- 8.16.0~rc2-1
- 8.16.0~rc2-2
- 8.16.0~rc3-1
- 8.17.0-1
- 8.17.0-2
- 8.17.0-3
- 8.17.0~rc1-1~exp1
- 8.17.0~rc2-1
- 8.17.0~rc3-1
- 8.18.0-1
- 8.18.0-1~bpo13+1
- 8.18.0-2
- 8.18.0~rc1-1+exp1
- 8.18.0~rc2-1
- 8.18.0~rc3-1
- 8.19.0-1
- 8.19.0-1+exp1
- 8.19.0-1~bpo13+1
- 8.19.0-2
- 8.19.0-3
- 8.19.0-3+exp1
- 8.19.0-3+exp2
- 8.19.0~rc1-1~exp1
- 8.19.0~rc2-1
- 8.19.0~rc2-2
- 8.19.0~rc3-1
- 8.20.0-1
- 8.20.0-1+exp
- 8.20.0-2
- 8.20.0-2+exp1
- 8.20.0-2~bpo13+1
- 8.20.0-3
- 8.20.0-4
- 8.20.0-5
- 8.20.0-5~bpo13+1
- 8.20.0~rc1-1+exp1
- 8.20.0~rc1-1+exp2
- 8.20.0~rc1-1+exp3
- 8.20.0~rc2-1
- 8.20.0~rc2-1+exp1
- 8.20.0~rc3-1
- 8.20.0~rc3-1+exp1
- 8.21.0-1
- 8.21.0-1+exp1
- 8.21.0-2
- 8.21.0-2+exp1
- 8.21.0-2~bpo13+1
- 8.21.0~rc1-1+exp1
- 8.21.0~rc2-1
- 8.21.0~rc2-1+exp1
- 8.21.0~rc3-1
- 8.21.0~rc3-1+exp1
- 8.22.0-1
- 8.22.0-1+exp1
- 8.22.0~rc2-1
- 8.22.0~rc2-2
- 8.22.0~rc3-1
- 8.22.0~rc3-1+exp1
- 8.23.0-1
- 8.23.0~rc1-1
- 8.23.0~rc1-2
- 8.23.0~rc2-1
- 8.23.0~rc2-1+exp1
- 8.23.0~rc3-1
- 8.23.0~rc3-1+exp1
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
curl Debian:14
Versions
- 8.14.1-2
- 8.14.1-2+exp1
- 8.15.0-1
- 8.15.0-1~bpo13+1
- 8.15.0-1~exp1
- 8.15.0~rc1-1exp1
- 8.15.0~rc2-1~exp1
- 8.15.0~rc3-1~exp1
- 8.16.0-1
- 8.16.0-1+exp1
- 8.16.0-1~bpo13+1
- 8.16.0-2
- 8.16.0-3
- 8.16.0-4
- 8.16.0-4~bpo13+1
- 8.16.0~rc1-1~exp1
- 8.16.0~rc2-1
- 8.16.0~rc2-2
- 8.16.0~rc3-1
- 8.17.0-1
- 8.17.0-2
- 8.17.0-3
- 8.17.0~rc1-1~exp1
- 8.17.0~rc2-1
- 8.17.0~rc3-1
- 8.18.0-1
- 8.18.0-1~bpo13+1
- 8.18.0-2
- 8.18.0~rc1-1+exp1
- 8.18.0~rc2-1
- 8.18.0~rc3-1
- 8.19.0-1
- 8.19.0-1+exp1
- 8.19.0-1~bpo13+1
- 8.19.0-2
- 8.19.0-3
- 8.19.0-3+exp1
- 8.19.0-3+exp2
- 8.19.0~rc1-1~exp1
- 8.19.0~rc2-1
- 8.19.0~rc2-2
- 8.19.0~rc3-1
- 8.20.0-1
- 8.20.0-1+exp
- 8.20.0-2
- 8.20.0-2+exp1
- 8.20.0-2~bpo13+1
- 8.20.0-3
- 8.20.0-4
- 8.20.0-5
- 8.20.0-5~bpo13+1
- 8.20.0~rc1-1+exp1
- 8.20.0~rc1-1+exp2
- 8.20.0~rc1-1+exp3
- 8.20.0~rc2-1
- 8.20.0~rc2-1+exp1
- 8.20.0~rc3-1
- 8.20.0~rc3-1+exp1
- 8.21.0-1
- 8.21.0-1+exp1
- 8.21.0-2
- 8.21.0-2+exp1
- 8.21.0-2~bpo13+1
- 8.21.0~rc1-1+exp1
- 8.21.0~rc2-1
- 8.21.0~rc2-1+exp1
- 8.21.0~rc3-1
- 8.21.0~rc3-1+exp1
- 8.22.0-1
- 8.22.0-1+exp1
- 8.22.0~rc2-1
- 8.22.0~rc2-2
- 8.22.0~rc3-1
- 8.22.0~rc3-1+exp1
- 8.23.0-1
- 8.23.0~rc1-1
- 8.23.0~rc1-2
- 8.23.0~rc2-1
- 8.23.0~rc2-1+exp1
- 8.23.0~rc3-1
- 8.23.0~rc3-1+exp1
Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
curl Ubuntu:22.04:LTS
Versions
- 7.74.0-1.3ubuntu2
- 7.74.0-1.3ubuntu3
- 7.80.0-3
- 7.81.0-1
- 7.81.0-1ubuntu1.1
- 7.81.0-1ubuntu1.2
- 7.81.0-1ubuntu1.3
- 7.81.0-1ubuntu1.4
- 7.81.0-1ubuntu1.6
- 7.81.0-1ubuntu1.7
- 7.81.0-1ubuntu1.8
- 7.81.0-1ubuntu1.10
- 7.81.0-1ubuntu1.11
- 7.81.0-1ubuntu1.13
- 7.81.0-1ubuntu1.14
- 7.81.0-1ubuntu1.15
- 7.81.0-1ubuntu1.16
- 7.81.0-1ubuntu1.17
- 7.81.0-1ubuntu1.18
- 7.81.0-1ubuntu1.19
- 7.81.0-1ubuntu1.20
- 7.81.0-1ubuntu1.21
- 7.81.0-1ubuntu1.22
- 7.81.0-1ubuntu1.23
- 7.81.0-1ubuntu1.24
- 7.81.0-1ubuntu1.25
- 7.81.0-1ubuntu1.26
- 7.81.0-1ubuntu1.27
- 7.81.0-1ubuntu1.29
Affected ranges
- ECOSYSTEM: < 7.81.0-1ubuntu1.30
Update to 7.81.0-1ubuntu1.30
curl Ubuntu:24.04:LTS
Versions
- 8.2.1-1ubuntu3
- 8.2.1-1ubuntu3.1
- 8.4.0-2ubuntu1
- 8.5.0-2ubuntu1
- 8.5.0-2ubuntu2
- 8.5.0-2ubuntu8
- 8.5.0-2ubuntu9
- 8.5.0-2ubuntu10
- 8.5.0-2ubuntu10.1
- 8.5.0-2ubuntu10.2
- 8.5.0-2ubuntu10.3
- 8.5.0-2ubuntu10.4
- 8.5.0-2ubuntu10.5
- 8.5.0-2ubuntu10.6
- 8.5.0-2ubuntu10.7
- 8.5.0-2ubuntu10.8
- 8.5.0-2ubuntu10.9
- 8.5.0-2ubuntu10.10
- 8.5.0-2ubuntu10.11
- 8.5.0-2ubuntu10.12
- 8.5.0-2ubuntu10.13
- 8.5.0-2ubuntu10.15
Affected ranges
- ECOSYSTEM: < 8.5.0-2ubuntu10.16
Update to 8.5.0-2ubuntu10.16
curl Ubuntu:26.10
Versions
- 8.18.0-1ubuntu2
- 8.20.0-2ubuntu1
- 8.20.0-2ubuntu3
- 8.20.0-2ubuntu10
- 8.20.0-2ubuntu11
Affected ranges
- ECOSYSTEM: < 8.20.0-2ubuntu11.1
Update to 8.20.0-2ubuntu11.1
curl Ubuntu:26.04:LTS
Versions
- 8.14.1-2ubuntu1
- 8.17.0-1ubuntu1
- 8.18.0-1ubuntu1
- 8.18.0-1ubuntu2
- 8.18.0-1ubuntu2.1
- 8.18.0-1ubuntu2.2
- 8.18.0-1ubuntu2.3
- 8.18.0-1ubuntu2.4
- 8.18.0-1ubuntu2.5
- 8.18.0-1ubuntu2.7
Affected ranges
- ECOSYSTEM: < 8.18.0-1ubuntu2.8
Update to 8.18.0-1ubuntu2.8

Original sources

Check your server →

CVE-2026-87862 · HSTS cache import drops longer-lived child

Affected products and versions

curl

curl Debian:13

curl Debian:14

curl Ubuntu:22.04:LTS

curl Ubuntu:24.04:LTS

curl Ubuntu:26.10

curl Ubuntu:26.04:LTS

Original sources