High severityNVD Advisory· Published Aug 8, 2023· Updated Oct 10, 2024

libp2p nodes vulnerable to attack using large RSA keys

CVE-2023-39533

Description

go-libp2p is the Go implementation of the libp2p Networking Stack. Prior to versions 0.27.8, 0.28.2, and 0.29.1 malicious peer can use large RSA keys to run a resource exhaustion attack & force a node to spend time doing signature verification of the large key. This vulnerability is present in the core/crypto module of go-libp2p and can occur during the Noise handshake and the libp2p x509 extension verification step. To prevent this attack, go-libp2p versions 0.27.8, 0.28.2, and 0.29.1 restrict RSA keys to <= 8192 bits. To protect one's application, it is necessary to update to these patch releases and to use the updated Go compiler in 1.20.7 or 1.19.12. There are no known workarounds for this issue.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
github.com/libp2p/go-libp2pGo	< 0.27.8	0.27.8
github.com/libp2p/go-libp2pGo	>= 0.28.0, < 0.28.2	0.28.2
github.com/libp2p/go-libp2pGo	>= 0.29.0, < 0.29.1	0.29.1

Affected products

Libp2p/Go Libp2pv5
Range: < 0.27.8

Patches

0cce607219f3

core/crypto: restrict RSA keys to <= 8192 bits (#2454)

https://github.com/libp2p/go-libp2pMarco MunizagaAug 3, 2023via ghsa

commit

3 files changed · +50 −0

core/crypto/rsa_common.go+3 −0 modified

@@ -12,9 +12,12 @@ const WeakRsaKeyEnv = "LIBP2P_ALLOW_WEAK_RSA_KEYS"
 
 var MinRsaKeyBits = 2048
 
+var maxRsaKeyBits = 8192
+
 // ErrRsaKeyTooSmall is returned when trying to generate or parse an RSA key
 // that's smaller than MinRsaKeyBits bits. In test
 var ErrRsaKeyTooSmall error
+var ErrRsaKeyTooBig error = fmt.Errorf("rsa keys must be <= %d bits", maxRsaKeyBits)
 
 func init() {
 	if _, ok := os.LookupEnv(WeakRsaKeyEnv); ok {

core/crypto/rsa_go.go+9 −0 modified

@@ -31,6 +31,9 @@ func GenerateRSAKeyPair(bits int, src io.Reader) (PrivKey, PubKey, error) {
 	if bits < MinRsaKeyBits {
 		return nil, nil, ErrRsaKeyTooSmall
 	}
+	if bits > maxRsaKeyBits {
+		return nil, nil, ErrRsaKeyTooBig
+	}
 	priv, err := rsa.GenerateKey(src, bits)
 	if err != nil {
 		return nil, nil, err
@@ -124,6 +127,9 @@ func UnmarshalRsaPrivateKey(b []byte) (key PrivKey, err error) {
 	if sk.N.BitLen() < MinRsaKeyBits {
 		return nil, ErrRsaKeyTooSmall
 	}
+	if sk.N.BitLen() > maxRsaKeyBits {
+		return nil, ErrRsaKeyTooBig
+	}
 	return &RsaPrivateKey{sk: *sk}, nil
 }
 
@@ -141,6 +147,9 @@ func UnmarshalRsaPublicKey(b []byte) (key PubKey, err error) {
 	if pk.N.BitLen() < MinRsaKeyBits {
 		return nil, ErrRsaKeyTooSmall
 	}
+	if pk.N.BitLen() > maxRsaKeyBits {
+		return nil, ErrRsaKeyTooBig
+	}
 
 	return &RsaPublicKey{k: *pk}, nil
 }

core/crypto/rsa_test.go+38 −0 modified

@@ -68,6 +68,44 @@ func TestRSASmallKey(t *testing.T) {
 	}
 }
 
+func TestRSABigKeyFailsToGenerate(t *testing.T) {
+	_, _, err := GenerateRSAKeyPair(maxRsaKeyBits*2, rand.Reader)
+	if err != ErrRsaKeyTooBig {
+		t.Fatal("should have refused to create too big RSA key")
+	}
+}
+
+func TestRSABigKey(t *testing.T) {
+	// Make the global limit smaller for this test to run faster.
+	// Note we also change the limit below, but this is different
+	origSize := maxRsaKeyBits
+	maxRsaKeyBits = 2048
+	defer func() { maxRsaKeyBits = origSize }() //
+
+	maxRsaKeyBits *= 2
+	badPriv, badPub, err := GenerateRSAKeyPair(maxRsaKeyBits, rand.Reader)
+	if err != nil {
+		t.Fatalf("should have succeeded, got: %s", err)
+	}
+	pubBytes, err := MarshalPublicKey(badPub)
+	if err != nil {
+		t.Fatal(err)
+	}
+	privBytes, err := MarshalPrivateKey(badPriv)
+	if err != nil {
+		t.Fatal(err)
+	}
+	maxRsaKeyBits /= 2
+	_, err = UnmarshalPublicKey(pubBytes)
+	if err != ErrRsaKeyTooBig {
+		t.Fatal("should have refused to unmarshal a too big key")
+	}
+	_, err = UnmarshalPrivateKey(privBytes)
+	if err != ErrRsaKeyTooBig {
+		t.Fatal("should have refused to unmarshal a too big key")
+	}
+}
+
 func TestRSASignZero(t *testing.T) {
 	priv, pub, err := GenerateRSAKeyPair(2048, rand.Reader)
 	if err != nil {

445be526aea4

core/crypto: restrict RSA keys to <= 8192 bits (#2454)

https://github.com/libp2p/go-libp2pMarco MunizagaAug 3, 2023via ghsa

commit

3 files changed · +50 −0

core/crypto/rsa_common.go+3 −0 modified

@@ -12,9 +12,12 @@ const WeakRsaKeyEnv = "LIBP2P_ALLOW_WEAK_RSA_KEYS"
 
 var MinRsaKeyBits = 2048
 
+var maxRsaKeyBits = 8192
+
 // ErrRsaKeyTooSmall is returned when trying to generate or parse an RSA key
 // that's smaller than MinRsaKeyBits bits. In test
 var ErrRsaKeyTooSmall error
+var ErrRsaKeyTooBig error = fmt.Errorf("rsa keys must be <= %d bits", maxRsaKeyBits)
 
 func init() {
 	if _, ok := os.LookupEnv(WeakRsaKeyEnv); ok {

core/crypto/rsa_go.go+9 −0 modified

@@ -31,6 +31,9 @@ func GenerateRSAKeyPair(bits int, src io.Reader) (PrivKey, PubKey, error) {
 	if bits < MinRsaKeyBits {
 		return nil, nil, ErrRsaKeyTooSmall
 	}
+	if bits > maxRsaKeyBits {
+		return nil, nil, ErrRsaKeyTooBig
+	}
 	priv, err := rsa.GenerateKey(src, bits)
 	if err != nil {
 		return nil, nil, err
@@ -124,6 +127,9 @@ func UnmarshalRsaPrivateKey(b []byte) (key PrivKey, err error) {
 	if sk.N.BitLen() < MinRsaKeyBits {
 		return nil, ErrRsaKeyTooSmall
 	}
+	if sk.N.BitLen() > maxRsaKeyBits {
+		return nil, ErrRsaKeyTooBig
+	}
 	return &RsaPrivateKey{sk: *sk}, nil
 }
 
@@ -141,6 +147,9 @@ func UnmarshalRsaPublicKey(b []byte) (key PubKey, err error) {
 	if pk.N.BitLen() < MinRsaKeyBits {
 		return nil, ErrRsaKeyTooSmall
 	}
+	if pk.N.BitLen() > maxRsaKeyBits {
+		return nil, ErrRsaKeyTooBig
+	}
 
 	return &RsaPublicKey{k: *pk}, nil
 }

core/crypto/rsa_test.go+38 −0 modified

@@ -68,6 +68,44 @@ func TestRSASmallKey(t *testing.T) {
 	}
 }
 
+func TestRSABigKeyFailsToGenerate(t *testing.T) {
+	_, _, err := GenerateRSAKeyPair(maxRsaKeyBits*2, rand.Reader)
+	if err != ErrRsaKeyTooBig {
+		t.Fatal("should have refused to create too big RSA key")
+	}
+}
+
+func TestRSABigKey(t *testing.T) {
+	// Make the global limit smaller for this test to run faster.
+	// Note we also change the limit below, but this is different
+	origSize := maxRsaKeyBits
+	maxRsaKeyBits = 2048
+	defer func() { maxRsaKeyBits = origSize }() //
+
+	maxRsaKeyBits *= 2
+	badPriv, badPub, err := GenerateRSAKeyPair(maxRsaKeyBits, rand.Reader)
+	if err != nil {
+		t.Fatalf("should have succeeded, got: %s", err)
+	}
+	pubBytes, err := MarshalPublicKey(badPub)
+	if err != nil {
+		t.Fatal(err)
+	}
+	privBytes, err := MarshalPrivateKey(badPriv)
+	if err != nil {
+		t.Fatal(err)
+	}
+	maxRsaKeyBits /= 2
+	_, err = UnmarshalPublicKey(pubBytes)
+	if err != ErrRsaKeyTooBig {
+		t.Fatal("should have refused to unmarshal a too big key")
+	}
+	_, err = UnmarshalPrivateKey(privBytes)
+	if err != ErrRsaKeyTooBig {
+		t.Fatal("should have refused to unmarshal a too big key")
+	}
+}
+
 func TestRSASignZero(t *testing.T) {
 	priv, pub, err := GenerateRSAKeyPair(2048, rand.Reader)
 	if err != nil {

e30fcf7dfd47

core/crypto: restrict RSA keys to <= 8192 bits (#2454)

https://github.com/libp2p/go-libp2pMarco MunizagaAug 3, 2023via ghsa

commit

3 files changed · +50 −0

core/crypto/rsa_common.go+3 −0 modified

@@ -12,9 +12,12 @@ const WeakRsaKeyEnv = "LIBP2P_ALLOW_WEAK_RSA_KEYS"
 
 var MinRsaKeyBits = 2048
 
+var maxRsaKeyBits = 8192
+
 // ErrRsaKeyTooSmall is returned when trying to generate or parse an RSA key
 // that's smaller than MinRsaKeyBits bits. In test
 var ErrRsaKeyTooSmall error
+var ErrRsaKeyTooBig error = fmt.Errorf("rsa keys must be <= %d bits", maxRsaKeyBits)
 
 func init() {
 	if _, ok := os.LookupEnv(WeakRsaKeyEnv); ok {

core/crypto/rsa_go.go+9 −0 modified

@@ -31,6 +31,9 @@ func GenerateRSAKeyPair(bits int, src io.Reader) (PrivKey, PubKey, error) {
 	if bits < MinRsaKeyBits {
 		return nil, nil, ErrRsaKeyTooSmall
 	}
+	if bits > maxRsaKeyBits {
+		return nil, nil, ErrRsaKeyTooBig
+	}
 	priv, err := rsa.GenerateKey(src, bits)
 	if err != nil {
 		return nil, nil, err
@@ -124,6 +127,9 @@ func UnmarshalRsaPrivateKey(b []byte) (key PrivKey, err error) {
 	if sk.N.BitLen() < MinRsaKeyBits {
 		return nil, ErrRsaKeyTooSmall
 	}
+	if sk.N.BitLen() > maxRsaKeyBits {
+		return nil, ErrRsaKeyTooBig
+	}
 	return &RsaPrivateKey{sk: *sk}, nil
 }
 
@@ -141,6 +147,9 @@ func UnmarshalRsaPublicKey(b []byte) (key PubKey, err error) {
 	if pk.N.BitLen() < MinRsaKeyBits {
 		return nil, ErrRsaKeyTooSmall
 	}
+	if pk.N.BitLen() > maxRsaKeyBits {
+		return nil, ErrRsaKeyTooBig
+	}
 
 	return &RsaPublicKey{k: *pk}, nil
 }

core/crypto/rsa_test.go+38 −0 modified

@@ -68,6 +68,44 @@ func TestRSASmallKey(t *testing.T) {
 	}
 }
 
+func TestRSABigKeyFailsToGenerate(t *testing.T) {
+	_, _, err := GenerateRSAKeyPair(maxRsaKeyBits*2, rand.Reader)
+	if err != ErrRsaKeyTooBig {
+		t.Fatal("should have refused to create too big RSA key")
+	}
+}
+
+func TestRSABigKey(t *testing.T) {
+	// Make the global limit smaller for this test to run faster.
+	// Note we also change the limit below, but this is different
+	origSize := maxRsaKeyBits
+	maxRsaKeyBits = 2048
+	defer func() { maxRsaKeyBits = origSize }() //
+
+	maxRsaKeyBits *= 2
+	badPriv, badPub, err := GenerateRSAKeyPair(maxRsaKeyBits, rand.Reader)
+	if err != nil {
+		t.Fatalf("should have succeeded, got: %s", err)
+	}
+	pubBytes, err := MarshalPublicKey(badPub)
+	if err != nil {
+		t.Fatal(err)
+	}
+	privBytes, err := MarshalPrivateKey(badPriv)
+	if err != nil {
+		t.Fatal(err)
+	}
+	maxRsaKeyBits /= 2
+	_, err = UnmarshalPublicKey(pubBytes)
+	if err != ErrRsaKeyTooBig {
+		t.Fatal("should have refused to unmarshal a too big key")
+	}
+	_, err = UnmarshalPrivateKey(privBytes)
+	if err != ErrRsaKeyTooBig {
+		t.Fatal("should have refused to unmarshal a too big key")
+	}
+}
+
 func TestRSASignZero(t *testing.T) {
 	priv, pub, err := GenerateRSAKeyPair(2048, rand.Reader)
 	if err != nil {

2350afd2e8ab

crypto/tls: restrict RSA keys in certificates to <= 8192 bits

https://github.com/golang/goRoland ShoemakerJun 7, 2023via ghsa

commit

3 files changed · +90 −0

src/crypto/tls/handshake_client.go+8 −0 modified

@@ -936,6 +936,10 @@ func (hs *clientHandshakeState) sendFinished(out []byte) error {
 	return nil
 }
 
+// maxRSAKeySize is the maximum RSA key size in bits that we are willing
+// to verify the signatures of during a TLS handshake.
+const maxRSAKeySize = 8192
+
 // verifyServerCertificate parses and verifies the provided chain, setting
 // c.verifiedChains and c.peerCertificates or sending the appropriate alert.
 func (c *Conn) verifyServerCertificate(certificates [][]byte) error {
@@ -947,6 +951,10 @@ func (c *Conn) verifyServerCertificate(certificates [][]byte) error {
 			c.sendAlert(alertBadCertificate)
 			return errors.New("tls: failed to parse certificate from server: " + err.Error())
 		}
+		if cert.cert.PublicKeyAlgorithm == x509.RSA && cert.cert.PublicKey.(*rsa.PublicKey).N.BitLen() > maxRSAKeySize {
+			c.sendAlert(alertBadCertificate)
+			return fmt.Errorf("tls: server sent certificate containing RSA key larger than %d bits", maxRSAKeySize)
+		}
 		activeHandles[i] = cert
 		certs[i] = cert.cert
 	}

src/crypto/tls/handshake_client_test.go+78 −0 modified

@@ -2721,3 +2721,81 @@ func testTLS13OnlyClientHelloCipherSuite(t *testing.T, ciphers []uint16) {
 		t.Fatalf("handshake failed: %s", err)
 	}
 }
+
+// discardConn wraps a net.Conn but discards all writes, but reports that they happened.
+type discardConn struct {
+	net.Conn
+}
+
+func (dc *discardConn) Write(data []byte) (int, error) {
+	return len(data), nil
+}
+
+// largeRSAKeyCertPEM contains a 8193 bit RSA key
+const largeRSAKeyCertPEM = `-----BEGIN CERTIFICATE-----
+MIIInjCCBIWgAwIBAgIBAjANBgkqhkiG9w0BAQsFADASMRAwDgYDVQQDEwd0ZXN0
+aW5nMB4XDTIzMDYwNzIxMjMzNloXDTIzMDYwNzIzMjMzNlowEjEQMA4GA1UEAxMH
+dGVzdGluZzCCBCIwDQYJKoZIhvcNAQEBBQADggQPADCCBAoCggQBAWdHsf6Rh2Ca
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+u58=
+-----END CERTIFICATE-----`
+
+func TestHandshakeRSATooBig(t *testing.T) {
+	testCert, _ := pem.Decode([]byte(largeRSAKeyCertPEM))
+
+	c := &Conn{conn: &discardConn{}, config: testConfig.Clone()}
+
+	expectedErr := "tls: server sent certificate containing RSA key larger than 8192 bits"
+	err := c.verifyServerCertificate([][]byte{testCert.Bytes})
+	if err == nil || err.Error() != expectedErr {
+		t.Errorf("Conn.verifyServerCertificate unexpected error: want %q, got %q", expectedErr, err)
+	}
+
+	expectedErr = "tls: client sent certificate containing RSA key larger than 8192 bits"
+	err = c.processCertsFromClient(Certificate{Certificate: [][]byte{testCert.Bytes}})
+	if err == nil || err.Error() != expectedErr {
+		t.Errorf("Conn.processCertsFromClient unexpected error: want %q, got %q", expectedErr, err)
+	}
+}

src/crypto/tls/handshake_server.go+4 −0 modified

@@ -864,6 +864,10 @@ func (c *Conn) processCertsFromClient(certificate Certificate) error {
 			c.sendAlert(alertBadCertificate)
 			return errors.New("tls: failed to parse client certificate: " + err.Error())
 		}
+		if certs[i].PublicKeyAlgorithm == x509.RSA && certs[i].PublicKey.(*rsa.PublicKey).N.BitLen() > maxRSAKeySize {
+			c.sendAlert(alertBadCertificate)
+			return fmt.Errorf("tls: client sent certificate containing RSA key larger than %d bits", maxRSAKeySize)
+		}
 	}
 
 	if len(certs) == 0 && requiresClientCert(c.config.ClientAuth) {

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

github.com/advisories/GHSA-876p-8259-xjggghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2023-39533ghsaADVISORY
github.com/golang/go/commit/2350afd2e8ab054390e284c95d5b089c142db017ghsax_refsource_MISCWEB
github.com/golang/go/issues/61460ghsax_refsource_MISCWEB
github.com/libp2p/go-libp2p/commit/0cce607219f3710addc7e18672cffd1f1d912fbbghsax_refsource_MISCWEB
github.com/libp2p/go-libp2p/commit/445be526aea4ee0b1fa5388aa65d32b2816d3a00ghsax_refsource_MISCWEB
github.com/libp2p/go-libp2p/commit/e30fcf7dfd4715ed89a5e68d7a4f774d3b9aa92dghsax_refsource_MISCWEB
github.com/libp2p/go-libp2p/pull/2454ghsax_refsource_MISCWEB
github.com/libp2p/go-libp2p/security/advisories/GHSA-876p-8259-xjggghsax_refsource_CONFIRMWEB
github.com/quic-go/quic-go/pull/4012ghsax_refsource_MISCWEB
go.dev/issue/61460ghsaWEB

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cvss	0.455
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000