Affected: Go: github.com/go-jose/go-jose/v4, Go: github.com/go-jose/go-jose/v3, Go: github.com/go-jose/go-jose

### Impact When parsing compact JWS or JWE input, go-jose could use excessive memory. The code used strings.Split(token, ".") to split JWT tokens, which is vulnerable to excessive memory consumption when processing maliciously crafted tokens with a large number of '.' characters. An attacker could exploit this by sending numerous malformed tokens, leading to memory exhaustion and a Denial of Service.

### Patches Version 4.0.5 fixes this issue

### Workarounds Applications could pre-validate payloads passed to go-jose do not contain an excessive number of '.' characters.

### References This is the same sort of issue as in the golang.org/x/oauth2/jws package as CVE-2025-22868 and Go issue https://go.dev/issue/71490.