CVE-2025-4673 Sensitive headers not cleared on cross-origin redirect in net/http
Medium 6.8
Published
Updated
Check this codebase for CVE-2025-4673 and fix it if it is affected.
What it is: CVE-2025-4673 is a medium-severity vulnerability in Go standard library net/http, published on 11 Jun 2025. 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-2025-4673 in the wild and no public exploit code.
Affected packages and fixed versions:
- golang (Bitnami): affected all versions; fixed in 1.23.10, 1.24.4
- stdlib (Go): affected all versions; fixed in 1.23.10, 1.24.4
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-2025-4673/ (Markdown: https://insights.sbomify.com/CVE-2025-4673/index.md)
Attackers can leak sensitive proxy authentication headers during cross-origin redirects in Go applications using the net/http package.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-4673?
CVE-2025-4673 is a medium-severity vulnerability in Go standard library net/http, published on 11 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Proxy-Authorization and Proxy-Authenticate headers persisted on cross-origin redirects potentially leaking sensitive information.
Which versions are affected by CVE-2025-4673?
2 open source packages ship an affected version, including golang and stdlib.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | All versions | 1.23.10, 1.24.4 |
stdlib Go | All versions | 1.23.10, 1.24.4 |
Linux distribution packages (38)
opentelemetry-collector AlmaLinux:10 | All versions | 0.127.0-3.el10_0 |
delve AlmaLinux:8 | All versions | 1.24.1-1.module_el8.10.0+3977+66935a26 |
go-toolset AlmaLinux:8 | All versions | 1.24.4-1.module_el8.10.0+4027+41c6fed2 |
golang AlmaLinux:8 | All versions | 1.24.4-1.module_el8.10.0+4027+41c6fed2 |
golang-bin AlmaLinux:8 | All versions | 1.24.4-1.module_el8.10.0+4027+41c6fed2 |
golang-docs AlmaLinux:8 | All versions | 1.24.4-1.module_el8.10.0+4027+41c6fed2 |
golang-misc AlmaLinux:8 | All versions | 1.24.4-1.module_el8.10.0+4027+41c6fed2 |
golang-src AlmaLinux:8 | All versions | 1.24.4-1.module_el8.10.0+4027+41c6fed2 |
golang-tests AlmaLinux:8 | All versions | 1.24.4-1.module_el8.10.0+4027+41c6fed2 |
go-toolset AlmaLinux:9 | All versions | 1.24.4-1.el9_6 |
golang AlmaLinux:9 | All versions | 1.24.4-1.el9_6 |
golang-bin AlmaLinux:9 | All versions | 1.24.4-1.el9_6 |
golang-docs AlmaLinux:9 | All versions | 1.24.4-1.el9_6 |
golang-misc AlmaLinux:9 | All versions | 1.24.4-1.el9_6 |
golang-race AlmaLinux:9 | All versions | 1.24.4-1.el9_6 |
golang-src AlmaLinux:9 | All versions | 1.24.4-1.el9_6 |
golang-tests AlmaLinux:9 | All versions | 1.24.4-1.el9_6 |
opentelemetry-collector AlmaLinux:9 | All versions | 0.127.0-2.el9_6 |
opentelemetry-collector Red Hat:enterprise_linux:10.0 | All versions | 0:0.127.0-3.el10_0 |
delve Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.1-1.module+el8.10.0+22945+b2c96a17 |
delve-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.1-1.module+el8.10.0+22945+b2c96a17 |
delve-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.1-1.module+el8.10.0+22945+b2c96a17 |
go-toolset Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.4-1.module+el8.10.0+23323+67916f33 |
golang Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.4-1.module+el8.10.0+23323+67916f33 |
golang-bin Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.4-1.module+el8.10.0+23323+67916f33 |
golang-docs Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.4-1.module+el8.10.0+23323+67916f33 |
golang-misc Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.4-1.module+el8.10.0+23323+67916f33 |
golang-src Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.4-1.module+el8.10.0+23323+67916f33 |
golang-tests Red Hat:enterprise_linux:8::appstream | All versions | 0:1.24.4-1.module+el8.10.0+23323+67916f33 |
opentelemetry-collector Red Hat:enterprise_linux:9::appstream | All versions | 0:0.127.0-2.el9_6 |
opentelemetry-collector Red Hat:rhel_eus:9.4::appstream | All versions | 0:0.127.0-2.el9_4 |
golang Rocky Linux:10 | All versions | 0:1.24.4-1.el10_0 |
opentelemetry-collector Rocky Linux:10 | All versions | 0:0.127.0-3.el10_0 |
delve Rocky Linux:8 | All versions | 0:1.24.1-1.module+el8.10.0+1951+c74bd827 |
delve Rocky Linux:8 | All versions | 0:1.24.1-1.module+el8.10.0+1987+42f155bb |
go-toolset Rocky Linux:8 | All versions | 0:1.24.4-1.module+el8.10.0+2008+0bb8dc3e |
golang Rocky Linux:8 | All versions | 0:1.24.4-1.module+el8.10.0+2008+0bb8dc3e |
golang Rocky Linux:9 | All versions | 0:1.24.4-1.el9_6 |
How do I fix CVE-2025-4673?
Upgrade golang to a fixed version for your release line: 1.23.10 or 1.24.4.
Is CVE-2025-4673 being exploited?
There is no known exploitation of CVE-2025-4673 in the wild and no public exploit code.
Sources
Also known as ALSA-2025:10672, ALSA-2025:10676, ALSA-2025:15887, ALSA-2025:16432, AZL-63716, AZL-63725 and 87 more.