CVE-2026-116587 Go JOSE: DoS when parsing JWKs that contain RSA keys
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-116587?
CVE-2026-116587 is a high-severity vulnerability in go-jose, published on 26 Oct 2026.
Official description
Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption (JWE), JSON Web Signature (JWS), and JSON Web Token (JWT) standards. Prior to 4.1.6, go-jose parses attacker-controlled RSA modulus and prime values from JWKs without enforcing size and consistency bounds before passing them to crypto/rsa.PrivateKey.Validate. On Go 1.24 and later, crafted large or degenerate RSA parameters can make that validation consume cubic CPU time, allowing remote denial of service in applications that parse JWKs from untrusted sources. This issue is fixed in version 4.1.6.
Which versions are affected by CVE-2026-116587?
4 open source packages ship an affected version, including github.com/go-jose/go-jose/v3 and github.com/go-jose/go-jose/v4.
| Package | Affected | Fixed in |
|---|---|---|
github.com/go-jose/go-jose/v3 Go | All versions to 3.0.5 | None |
github.com/go-jose/go-jose/v3 Go | All versions to 3.0.5 | None |
github.com/go-jose/go-jose/v4 Go | All versions | 4.1.6 |
github.com/go-jose/go-jose/v4 Go | All versions | 4.1.6 |
How do I fix CVE-2026-116587?
Upgrade to a fixed version.
Is CVE-2026-116587 being exploited?
There is no known exploitation of CVE-2026-116587 in the wild and no public exploit code.
Sources
Also known as GHSA-mgcc-cww5-fp2q, MINI-2579-3v7q-53x8, MINI-2jgx-fv9c-rm69, MINI-2qwr-f38f-g29r, MINI-2x67-82fv-2r8h, MINI-325m-mmrg-3qph and 58 more.