Medium severity5.3NVD Advisory· Published Apr 1, 2025· Updated Apr 15, 2026
CVE-2025-31135
CVE-2025-31135
Description
Go-Guerrilla SMTP Daemon is a lightweight SMTP server written in Go. Prior to 1.6.7, when ProxyOn is enabled, the PROXY command will be accepted multiple times, with later invocations overriding earlier ones. The proxy protocol only supports one initial PROXY header; anything after that is considered part of the exchange between client and server, so the client is free to send further PROXY commands with whatever data it pleases. go-guerrilla will treat these as coming from the reverse proxy, allowing a client to spoof its IP address. This vulnerability is fixed in 1.6.7.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/phires/go-guerrillaGo | < 1.6.7 | 1.6.7 |
Affected products
2- ghsa-coords2 versionspkg:golang/github.com/phires/go-guerrillapkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Tumbleweed
< 1.6.7+ 1 more
- (no CPE)range: < 1.6.7
- (no CPE)range: < 0.0.20250402T160203-1.1
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-c2c3-pqw5-5p7cghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-31135ghsaADVISORY
- github.com/phires/go-guerrilla/commit/7673947f2d5204a135d7ae0b7f80759e548abee6ghsaWEB
- github.com/phires/go-guerrilla/security/advisories/GHSA-c2c3-pqw5-5p7cnvdWEB
- pkg.go.dev/vuln/GO-2025-3588ghsaWEB
- github.com/phires/go-guerrilla/commit/d08fe22f8022d2bdedc136f9e4ba96f2fbbebf18nvd
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