CVE catalog
CVE-2025-8556
golang-github-cloudflare-circl: CVE-2025-8556
- Severity
- Low · CVSS 3.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.50% · Oct 25, 2026
A flaw was found in CIRCL's implementation of the FourQ elliptic curve. This vulnerability allows an attacker to compromise session security via low-order point injection and incorrect point validation during Diffie-Hellman key exchange.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | golang-github-cloudflare-circl | sid | 1.6.5-2 | fixed |
| Debian | golang-github-cloudflare-circl | forky | 1.6.5-2 | fixed |
| Debian | golang-github-cloudflare-circl | trixie | 1.6.1-1 | fixed |
| Debian | golang-github-cloudflare-circl | bookworm | 1.3.1-2 | vulnerable |
| Ubuntu | golang-github-cloudflare-circl | 22.04 | 1.0.0+20200724-1 | vulnerable |
| Ubuntu | golang-github-cloudflare-circl | 22.04 | 1.0.0+20200724-1ubuntu1 | vulnerable |
| Ubuntu | golang-github-cloudflare-circl | 24.04 | 1.3.3-1 | vulnerable |
| Ubuntu | golang-github-cloudflare-circl | 24.04 | 1.3.5-1 | vulnerable |
| Ubuntu | golang-github-cloudflare-circl | 24.04 | 1.3.6-1 | vulnerable |
| Ubuntu | golang-github-cloudflare-circl | 24.04 | 1.3.7-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | golang-github-cloudflare-circl | source | sid | 1.6.1-1 | not yet assigned | Not reported | Not reported |
| Debian | golang-github-cloudflare-circl | source | forky | 1.6.1-1 | not yet assigned | Not reported | Not reported |
| Debian | golang-github-cloudflare-circl | source | trixie | 1.6.1-1 | not yet assigned | Not reported | Not reported |
| Debian | golang-github-cloudflare-circl | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
Notes
[bookworm] golang-github-cloudflare-circl: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [golang-github-cloudflare-circl-dev]Affected
Source package: [golang-github-cloudflare-circl]
Details (2)
1.3.1-2· all · bookwormAffected
dsa · golang-github-cloudflare-circl · debian · bookworm; dsa · golang-github-cloudflare-circl · debian · 12
1.3.1-2· all · bookwormAffected
dsa · golang-github-cloudflare-circl · debian · bookworm; dsa · golang-github-cloudflare-circl · debian · 12
[Debian 13 (Trixie)]
Source package: [golang-github-cloudflare-circl]
Details (2)
1.6.1-1· all · trixieFixed · Fixed:
1.6.1-1dsa · golang-github-cloudflare-circl · debian · 13
1.6.1-1· all · trixieFixed · Fixed:
1.6.1-1dsa · golang-github-cloudflare-circl · debian · 13
Observed:
References
- [https://access.redhat.com/security/cve/CVE-2025-8556]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2371624]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10013-1.json]
- [https://github.com/cloudflare/circl]
- [https://github.com/cloudflare/circl/security/advisories/GHSA-2x5j-vhc8-9cwm]
- [https://github.com/cloudflare/circl/tree/v1.6.1]
- [https://news.ycombinator.com/item?id=45669593]
- [https://nvd.nist.gov/vuln/detail/CVE-2025-8556]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2025-8556]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2025-8556]
- [https://security-tracker.debian.org/tracker/CVE-2025-8556]
- [https://www.botanica.software/blog/cryptographic-issues-in-cloudflares-circl-fourq-implementation]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]