on my side it is clearly the certificate for https://e.email that is showed.
…
after further investigation, some tcpdump, strace and so on, I have found on thunderbird some address-book relaying on https://e.email (from long time ago) that are sync from time to time. after unsubscribing, et re-enter with murena.io the alert seems t have disappear.
showcert.sh e.email
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
71:2f:43:f1:e2:e1:8c:b3:d1:a3:e8:94:ec:62:6f:6b
Signature Algorithm: sha256WithRSAEncryption
Issuer: O=Acme Co, CN=Kubernetes Ingress Controller Fake Certificate
Validity
Not Before: Mar 25 20:49:54 2025 GMT
Not After : Mar 25 20:49:54 2026 GMT
Subject: O=Acme Co, CN=Kubernetes Ingress Controller Fake Certificate
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:d0:ee:33:59:8d:50:a0:58:52:0d:42:b8:2e:38:
f8:b0:3d:06:1c:0a:14:25:f1:ac:3e:8c:91:0c:d6:
c6:ec:85:9a:94:bb:ba:27:7e:44:30:14:b9:f0:57:
a9:54:47:b7:0d:61:87:e8:60:41:3c:1b:84:8f:a6:
e8:e9:8e:75:bf:7f:cc:f4:1f:cf:ec:af:32:c4:90:
a5:57:93:04:f4:63:e3:f6:a0:6d:be:66:26:cd:07:
3a:f0:87:75:61:71:b4:9d:4f:e6:44:1c:1c:2e:65:
c6:4e:f7:75:f7:f6:4f:24:6c:b1:78:ba:6b:95:7a:
ab:da:4f:e0:12:fb:43:71:0c:09:cd:ad:76:6f:6f:
3b:aa:b2:5b:f1:52:66:16:38:86:1a:f1:61:76:d9:
45:5e:de:41:d5:19:68:a9:20:8a:7c:7b:06:95:b9:
a0:ce:bf:df:b5:f0:49:b0:16:dc:dd:be:c7:4c:0d:
ae:9b:74:e8:67:47:3a:88:fc:f7:86:27:f5:40:4b:
ab:02:b6:62:50:12:8e:cb:7f:aa:fa:98:81:2d:bf:
9c:ac:2d:a6:bb:ae:54:be:01:e1:2a:17:1a:3c:44:
f7:c8:5a:2f:fb:8f:b4:1c:ae:36:04:15:17:4a:9e:
aa:63:a8:91:37:2a:6d:00:b8:b7:28:9b:c3:51:21:
83:eb
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Key Usage: critical
Digital Signature, Key Encipherment
X509v3 Extended Key Usage:
TLS Web Server Authentication
X509v3 Basic Constraints: critical
CA:FALSE
X509v3 Subject Alternative Name:
DNS:ingress.local
Signature Algorithm: sha256WithRSAEncryption
Signature Value:
94:d4:62:76:f9:e0:2a:63:8d:ba:5e:6e:0c:2d:fa:e0:fd:1d:
53:33:72:c6:72:2c:97:35:3d:7b:7d:47:ea:3a:fd:a2:6d:ba:
46:f5:d3:e1:1e:52:7a:98:8f:4f:7b:0f:40:92:0e:50:97:ef:
42:71:22:7b:bd:11:2d:09:f0:cf:fa:29:15:82:8c:47:71:ad:
3b:ed:b5:dd:8f:a8:4b:ea:f0:e5:e0:cb:38:1e:44:f0:81:c1:
c1:89:7f:c3:2c:62:b5:9e:2f:4c:b7:e4:d5:1b:34:be:96:29:
8d:71:c8:a4:bd:0d:73:d9:df:f1:86:89:3f:08:4c:62:83:08:
93:6e:3b:ce:05:cb:7b:a0:d6:87:20:00:54:6f:27:a3:d7:96:
1f:29:6d:89:f5:61:55:29:07:cc:78:a5:0d:61:48:2d:01:74:
38:db:69:fe:07:e6:d3:48:e3:b8:cf:4d:58:26:e0:d6:65:1b:
f1:ff:ab:0a:19:57:3b:e8:11:17:50:ad:e2:44:ca:f7:79:c2:
b4:0c:db:81:23:55:09:24:87:ba:3c:96:be:be:95:c6:0e:66:
fc:25:3f:88:77:0e:39:69:3c:97:b3:4a:89:bb:ed:60:52:f0:
33:a9:00:11:33:b3:ad:dc:6f:c3:fc:ce:1e:7d:88:0a:bb:1b:
7d:ec:ce:24
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----