CVE-2026-25679 Incorrect parsing of IPv6 host literals in net/url
High 7.5
Published
Updated
Check this codebase for CVE-2026-25679 and fix it if it is affected.
What it is: CVE-2026-25679 is a high-severity vulnerability in Golang Go, published on 6 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-25679 in the wild and no public exploit code.
Affected packages and fixed versions:
- golang (Bitnami): affected all versions; fixed in 1.25.8, 1.26.1
- stdlib (Go): affected all versions; fixed in 1.25.8, 1.26.1
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-25679/ (Markdown: https://insights.sbomify.com/CVE-2026-25679/index.md)
The Go net/url library incorrectly parses IPv6 host literals, potentially allowing security bypasses in applications relying on URL validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-25679?
CVE-2026-25679 is a high-severity vulnerability in Golang Go, published on 6 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
url.Parse insufficiently validated the host/authority component and accepted some invalid URLs.
Which versions are affected by CVE-2026-25679?
2 open source packages ship an affected version, including golang and stdlib. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | All versions | 1.25.8, 1.26.1 |
stdlib Go | All versions | 1.25.8, 1.26.1 |
Linux distribution packages (38)
buildah AlmaLinux:10 | All versions | 2:1.43.1-1.el10_2 |
buildah-tests AlmaLinux:10 | All versions | 2:1.43.1-1.el10_2 |
git-lfs AlmaLinux:10 | All versions | 3.6.1-8.el10_1 |
go-srpm-macros AlmaLinux:10 | All versions | 3.6.0-8.el10_1 |
grafana AlmaLinux:10 | All versions | 10.2.6-23.el10_1 |
grafana-pcp AlmaLinux:10 | All versions | 5.3.0-3.el10_1 |
grafana-selinux AlmaLinux:10 | All versions | 10.2.6-23.el10_1 |
image-builder AlmaLinux:10 | All versions | 31-5.el10_1 |
ipp-usb AlmaLinux:10 | All versions | 0.9.27-5.el10_1.1 |
osbuild-composer AlmaLinux:10 | All versions | 149-6.el10_1.alma.3 |
osbuild-composer-core AlmaLinux:10 | All versions | 149-6.el10_1.alma.3 |
osbuild-composer-worker AlmaLinux:10 | All versions | 149-6.el10_1.alma.3 |
skopeo AlmaLinux:10 | All versions | 2:1.22.2-1.el10_2 |
skopeo-tests AlmaLinux:10 | All versions | 2:1.22.2-1.el10_2 |
yggdrasil AlmaLinux:10 | All versions | 0.4.8-4.el10_1 |
yggdrasil-devel AlmaLinux:10 | All versions | 0.4.8-4.el10_1 |
yggdrasil-worker-package-manager AlmaLinux:10 | All versions | 0.2.3-5.el10_1 |
yggdrasil-worker-package-manager AlmaLinux:10 | All versions | 0.2.3-6.el10_2 |
grafana AlmaLinux:8 | All versions | 9.2.10-29.el8_10 |
grafana-pcp AlmaLinux:8 | All versions | 5.1.1-13.el8_10 |
grafana-selinux AlmaLinux:8 | All versions | 9.2.10-29.el8_10 |
osbuild-composer AlmaLinux:8 | All versions | 101.4-5.el8_10.alma.1 |
osbuild-composer-core AlmaLinux:8 | All versions | 101.4-5.el8_10.alma.1 |
osbuild-composer-worker AlmaLinux:8 | All versions | 101.4-5.el8_10.alma.1 |
git-lfs AlmaLinux:9 | All versions | 3.6.1-8.el9_7 |
go-filesystem AlmaLinux:9 | All versions | 3.6.0-14.el9_7 |
go-rpm-macros AlmaLinux:9 | All versions | 3.6.0-14.el9_7 |
go-rpm-templates AlmaLinux:9 | All versions | 3.6.0-14.el9_7 |
go-srpm-macros AlmaLinux:9 | All versions | 3.6.0-14.el9_7 |
grafana AlmaLinux:9 | All versions | 10.2.6-19.el9_7 |
grafana-pcp AlmaLinux:9 | All versions | 5.1.1-13.el9_7 |
grafana-selinux AlmaLinux:9 | All versions | 10.2.6-19.el9_7 |
image-builder AlmaLinux:9 | All versions | 31-4.el9_7 |
osbuild-composer AlmaLinux:9 | All versions | 149-5.el9_7.alma.3 |
osbuild-composer-core AlmaLinux:9 | All versions | 149-5.el9_7.alma.3 |
osbuild-composer-worker AlmaLinux:9 | All versions | 149-5.el9_7.alma.3 |
git-lfs Red Hat:enterprise_linux:10.1 | All versions | 0:3.6.1-8.el10_1 |
git-lfs-debuginfo Red Hat:enterprise_linux:10.1 | All versions | 0:3.6.1-8.el10_1 |
Products include Golang Go.
How do I fix CVE-2026-25679?
Upgrade golang to a fixed version for your release line: 1.25.8 or 1.26.1.
Is CVE-2026-25679 being exploited?
There is no known exploitation of CVE-2026-25679 in the wild and no public exploit code.
Other vulnerabilities in Golang Go
- CVE-2020-0601 Microsoft Windows CryptoAPI Spoofing
- CVE-2026-27143 Missing bound checks can lead to memory corruption in safe Go in cmd/compile
- CVE-2024-24790 Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses in net/netip
- CVE-2023-39320 Arbitrary code execution via go.mod toolchain directive in cmd/go
- CVE-2023-24540 Improper handling of JavaScript whitespace in html/template
Sources
Also known as ALSA-2026:11412, ALSA-2026:11413, ALSA-2026:13642, ALSA-2026:13643, ALSA-2026:13671, ALSA-2026:19031 and 674 more.