Moderate severityNVD Advisory· Published Dec 3, 2025· Updated Dec 3, 2025
Envoy’s TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte
CVE-2025-66220
Description
Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, Envoy’s mTLS certificate matcher for match_typed_subject_alt_names may incorrectly treat certificates containing an embedded null byte (\0) inside an OTHERNAME SAN value as valid matches.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/envoyproxy/envoyGo | >= 1.36.0, < 1.36.3 | 1.36.3 |
github.com/envoyproxy/envoyGo | >= 1.35.0, < 1.35.7 | 1.35.7 |
github.com/envoyproxy/envoyGo | >= 1.34.0, < 1.34.11 | 1.34.11 |
github.com/envoyproxy/envoyGo | < 1.33.13 | 1.33.13 |
Affected products
3- osv-coords2 versions
< 1.33.13+ 1 more
- (no CPE)range: < 1.33.13
- (no CPE)range: >= 1.36.0, < 1.36.3
- Range: >= 1.36.0, <= 1.36.2
Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-rwjg-c3h2-f57pghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-66220ghsaADVISORY
- github.com/envoyproxy/envoy/security/advisories/GHSA-rwjg-c3h2-f57pghsax_refsource_CONFIRMWEB
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