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auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback

🗓️ 01 Jul 2026 18:16:22Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 29 Views

auth-fetch-mcp SSRF bypass via IPv4 mapped IPv6 loopback; isPrivateV6 fails to detect.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-49857
13 Aug 202614:50
–attackerkb
circl
Circl
CVE-2026-49857
1 Jul 202620:35
–circl
cve
CVE
CVE-2026-49857
13 Aug 202614:50
–cve
cvelist
Cvelist
CVE-2026-49857 auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback
13 Aug 202614:50
–cvelist
euvd
EUVD
EUVD-2026-58054
13 Aug 202614:50
–euvd
mend
Mend
CVE-2026-49857
13 Aug 202614:50
–mend
nvd
NVD
CVE-2026-49857
13 Aug 202615:19
–nvd
osv_ghsa
osv_ghsa
GHSA-PVRJ-8CG3-J5F8 auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback
1 Jul 202618:16
–osv_ghsa
patchstack
Patchstack
NPM: auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback
1 Jul 202618:16
–patchstack
ptsecurity
Positive Technologies
PT-2026-55211
1 Jul 202600:00
–ptsecurity
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Vulners
Node
auth-fetch-mcpRange≤3.0.1npm

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01 Jul 2026 18:16Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.17.4
EPSS0.00488
29