Vulnerability · Published Jul 3, 2026 · Assigned by curl
CVE-2026-8924trailing dot domain super cookie
Critical 9.1
In plain English
A critical-severity security flaw in curl from curl. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.7%top 48.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set "super cookies" that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | curl | 8.12.1-4.el10_2.6 | ALSA-2026:69125 |
| AlmaLinux:8 | curl | 7.61.1-34.el8_10.18 | ALSA-2026:92368 |
| AlmaLinux:9 | curl | 7.76.1-40.el9_8.8 | ALSA-2026:80511 |
| AlmaLinux:9 | curl-minimal | 7.76.1-40.el9_8.8 | ALSA-2026:80511 |
| AlmaLinux:10 | libcurl | 8.12.1-4.el10_2.6 | ALSA-2026:69125 |
| AlmaLinux:8 | libcurl | 7.61.1-34.el8_10.18 | ALSA-2026:92368 |
| AlmaLinux:9 | libcurl | 7.76.1-40.el9_8.8 | ALSA-2026:80511 |
| AlmaLinux:10 | libcurl-devel | 8.12.1-4.el10_2.6 | ALSA-2026:69125 |
| AlmaLinux:8 | libcurl-devel | 7.61.1-34.el8_10.18 | ALSA-2026:92368 |
| AlmaLinux:9 | libcurl-devel | 7.76.1-40.el9_8.8 | ALSA-2026:80511 |
| AlmaLinux:10 | libcurl-minimal | 8.12.1-4.el10_2.6 | ALSA-2026:69125 |
| AlmaLinux:8 | libcurl-minimal | 7.61.1-34.el8_10.18 | ALSA-2026:92368 |
| AlmaLinux:9 | libcurl-minimal | 7.76.1-40.el9_8.8 | ALSA-2026:80511 |
| Alpine:v3.21 | curl | 8.14.1-r3 | ALPINE-CVE-2026-8924 |
| Alpine:v3.22 | curl | 8.14.1-r4 | ALPINE-CVE-2026-8924 |
| Alpine:v3.23 | curl | 8.22.0-r0 | ALPINE-CVE-2026-8924 |
| Alpine:v3.24 | curl | 8.21.0-r0 | ALPINE-CVE-2026-8924 |
| Debian:12 | curl | no fix listed | DEBIAN-CVE-2026-8924 |
| Debian:13 | curl | 8.14.1-2+deb13u7 | DEBIAN-CVE-2026-8924 |
| Debian:14 | curl | 8.21.0~rc2-1 | DEBIAN-CVE-2026-8924 |
| Rocky Linux:10 | curl | 0:8.12.1-4.el10_2.6 | RLSA-2026:69125 |
| Rocky Linux:8 | curl | 0:7.61.1-34.el8_10.18 | RLSA-2026:92368 |
| Rocky Linux:9 | curl | 0:7.76.1-40.el9_8.8 | RLSA-2026:80511 |
| Ubuntu:22.04:LTS | curl | 7.81.0-1ubuntu1.25 | UBUNTU-CVE-2026-8924 |
| Ubuntu:24.04:LTS | curl | 8.5.0-2ubuntu10.10 | UBUNTU-CVE-2026-8924 |
| Ubuntu:25.10 | curl | 8.14.1-2ubuntu1.4 | UBUNTU-CVE-2026-8924 |
| Ubuntu:26.04:LTS | curl | 8.18.0-1ubuntu2.2 | UBUNTU-CVE-2026-8924 |
Affected products (as reported)
Weakness: CWE-201 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N