CVE-2026-31959 SSRF in Quill via unvalidated URL from Apple notarization log retrieval
An attacker with TLS interception capabilities can force Quill to fetch arbitrary URLs, potentially exposing internal network data or cloud credentials.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31959?
CVE-2026-31959 is a medium-severity server-side request forgery vulnerability in anchore quill, published on 11 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Quill provides simple mac binary signing and notarization from any platform. Quill before version v0.7.1 contains a Server-Side Request Forgery (SSRF) vulnerability when attempting to fetch the Apple notarization submission logs. Exploitation requires the ability to modify API responses from Apple's notarization service, which is not possible under standard network conditions due to HTTPS with proper TLS certificate validation; however, environments with TLS-intercepting proxies (common in corporate networks), compromised certificate authorities, or other trust boundary violations are at risk. When retrieving submission logs, Quill fetches a URL provided in the API response without validating that the scheme is https or that the host does not point to a local or multicast IP address. An attacker who can tamper with the response can supply an arbitrary URL, causing the Quill client to issue HTTP or HTTPS requests to attacker-controlled or internal network destinations. This could lead to exfiltration of sensitive data such as cloud provider credentials or internal service responses. Both the Quill CLI and library are affected when used to retrieve notarization submission logs. This vulnerability is fixed in 0.7.1.
Weakness: CWE-918
Which versions are affected by CVE-2026-31959?
3 open source packages ship an affected version, including github.com/anchore/quill. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/anchore/quill Go | All versions | 0.7.1 |
github.com/anchore/quill Go | All versions | 0.7.1 |
github.com/anchore/quill Go | All versions | 0.7.1 |
Products include Anchore Quill.
How do I fix CVE-2026-31959?
Upgrade github.com/anchore/quill to 0.7.1 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-31959 being exploited?
There is no known exploitation of CVE-2026-31959 in the wild and no public exploit code.
Other vulnerabilities in anchore quill
Sources
Also known as GHSA-7q3q-5px6-4c5p, GO-2026-4671.