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Medium severityNVD Advisory· Published Feb 24, 2025· Updated Apr 15, 2026

CVE-2025-27144

CVE-2025-27144

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. In versions on the 4.x branch prior to version 4.0.5, 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. Version 4.0.5 fixes this issue. As a workaround, applications could pre-validate that payloads passed to Go JOSE do not contain an excessive number of . characters.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/go-jose/go-jose/v4Go
< 4.0.54.0.5
github.com/go-jose/go-jose/v3Go
< 3.0.43.0.4
github.com/go-jose/go-joseGo
< 3.0.43.0.4

Patches

1
99b346cec4e8

Don't allow unbounded amounts of splits (#167)

https://github.com/go-jose/go-joseMatthew McPherrinFeb 24, 2025via ghsa
commit
3 files changed · +9 −4
  • jwe.go+3 −2 modified
    @@ -288,10 +288,11 @@ func ParseEncryptedCompact(
 	keyAlgorithms []KeyAlgorithm,
 	contentEncryption []ContentEncryption,
 ) (*JSONWebEncryption, error) {
-	parts := strings.Split(input, ".")
-	if len(parts) != 5 {
+	// Five parts is four separators
+	if strings.Count(input, ".") != 4 {
 		return nil, fmt.Errorf("go-jose/go-jose: compact JWE format must have five parts")
 	}
+	parts := strings.SplitN(input, ".", 5)
 
 	rawProtected, err := base64.RawURLEncoding.DecodeString(parts[0])
 	if err != nil {
  • jws.go+3 −2 modified
    @@ -327,10 +327,11 @@ func parseSignedCompact(
 	payload []byte,
 	signatureAlgorithms []SignatureAlgorithm,
 ) (*JSONWebSignature, error) {
-	parts := strings.Split(input, ".")
-	if len(parts) != 3 {
+	// Three parts is two separators
+	if strings.Count(input, ".") != 2 {
 		return nil, fmt.Errorf("go-jose/go-jose: compact JWS format must have three parts")
 	}
+	parts := strings.SplitN(input, ".", 3)
 
 	if parts[1] != "" && payload != nil {
 		return nil, fmt.Errorf("go-jose/go-jose: payload is not detached")
  • jws_test.go+3 −0 modified
    @@ -119,6 +119,9 @@ func TestCompactParseJWS(t *testing.T) {
 		"////.eyJhbGciOiJYWVoifQ.c2lnbmF0dXJl",
 		// Invalid header
 		"cGF5bG9hZA.cGF5bG9hZA.c2lnbmF0dXJl",
+		// Too many parts
+		"eyJhbGciOiJYWVoifQ.cGF5bG9hZA.c2lnbmF0dXJl.....................................................",
+		"eyJhbGciOiJYWVoifQ.cGF5bG9hZA.c2lnbmF0dXJl.cGF5bG9hZA.cGF5bG9hZA.cGF5bG9hZA....................",
 	}
 
 	for i := range failures {

Vulnerability mechanics

Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

7

News mentions

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