# CVE-2026-88882: Renovate before 44.11.2 Credential Exfiltration via Link Header

> A malicious NuGet registry can exfiltrate credentials by directing Renovate to an attacker-controlled server via the Link header during pagination.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Sep 2026
- **Updated:** 29 Sep 2026
- **Also known as:** GHSA-978f-wwpx-5hh6, GHSA-rh7w-ccch-gh49

## What is CVE-2026-88882?

CVE-2026-88882 is a critical server-side request forgery vulnerability in mend-renovate-ce, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Renovate is a dependency update automation tool. In versions before 44.11.2 (and Mend Renovate CE/EE images and charts before 15.4.0, and mend-renovate-enterprise-edition helm chart before 10.4.0), when listing new package versions from a NuGet registry Renovate follows pagination URLs supplied by the registry in the HTTP `Link` header without verifying that the target has the same origin as the configured registry. Registry credentials are attached to the request for the 'next' page, so a malicious or compromised NuGet registry can return a `Link` header pointing at an attacker-controlled server and cause Renovate to send the registry credentials to that server. Exploitation requires the remote registry to be malicious or compromised; such a registry would normally already have received the credentials on the initial request, so the issue primarily allows the credentials to be delivered to an additional, attacker-chosen host. The fix restricts pagination to the same origin; the previous behaviour can be re-enabled with the RENOVATE_X_NUGET_PAGINATION_ALLOW_CROSS_ORIGIN option.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2026-88882?


## How do I fix CVE-2026-88882?

No fix has been published for CVE-2026-88882 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-88882 being exploited?

There is no known exploitation of CVE-2026-88882 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-88882 and fix it if it is affected.

What it is: CVE-2026-88882 is a critical server-side request forgery vulnerability in mend-renovate-ce, published on 10 Sep 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-2026-88882 in the wild and no public exploit code.

Affected product: mend-renovate-ce. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-88882/ (Markdown: https://insights.sbomify.com/CVE-2026-88882/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88882
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88882
- OSV: https://osv.dev/vulnerability/CVE-2026-88882

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-88882/
Summaries are generated and may contain mistakes; the official description above is the record.