When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability affects Firefox < 134, Firefox ESR < 128.6, Thunderbird < 134, and Thunderbird < 128.6.
[
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{
"fixed": "128.6.0"
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{
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{
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{
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{
"events": [
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]
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-0239.json"