# Go Programming Language 1.27.3 Go Programming Language 1.27.3, released October 19, 2026, fixes 19 CVEs in Go Programming Language. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Go Programming Language is 1.27.4, which also fixes every one of these CVEs. - Web page: https://patchblox.com/security/fix/windows-app/golang.go-1.27.3 - Platform: Windows apps - Released: Oct 19, 2026 - Priority: Urgent (Closes CVE-2026-56857, rated Critical) - CVEs: 19, exploited: 0, on CISA KEV: 0 - Superseded by: [Go Programming Language 1.27.4](https://patchblox.com/security/data/product/windows-app/go-programming-language.md), the latest version, which also fixes every CVE listed here ## Applies to | Product | Release | Fixed in | |---|---|---| | [Go Programming Language](https://patchblox.com/security/data/product/windows-app/go-programming-language.md) | | 1.27.3 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2026-56857](https://patchblox.com/security/data/cve/CVE-2026-56857.md) | Urgent | Root.Mkdir(All) can follow junctions out of the root on Windows in os | 9.8 | 0.0055 | | | [CVE-2026-97031](https://patchblox.com/security/data/cve/CVE-2026-97031.md) | High | Reject malformed ECH outer extension references in crypto/tls | 7.5 | 0.0072 | | | [CVE-2026-94440](https://patchblox.com/security/data/cve/CVE-2026-94440.md) | High | Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart | 7.5 | 0.0071 | | | [CVE-2026-56866](https://patchblox.com/security/data/cve/CVE-2026-56866.md) | High | HTTP/1 client connection desynchronization after CONNECT rejection in net/http | 7.5 | 0.0060 | | | [CVE-2026-33818](https://patchblox.com/security/data/cve/CVE-2026-33818.md) | High | Enforce maximum recursion depth in encoding/asn1 | 8.8 | 0.0057 | | | [CVE-2026-56859](https://patchblox.com/security/data/cve/CVE-2026-56859.md) | High | Add recursion depth guard during decode in encoding/xml | 8.8 | 0.0057 | | | [CVE-2026-56862](https://patchblox.com/security/data/cve/CVE-2026-56862.md) | High | Limit handshake messages we are willing to accept post-handshake in crypto/tls | 8.8 | 0.0057 | | | [CVE-2026-56860](https://patchblox.com/security/data/cve/CVE-2026-56860.md) | High | Avoid quadratic complexity in resolvePath in net/url | 8.8 | 0.0055 | | | [CVE-2026-46600](https://patchblox.com/security/data/cve/CVE-2026-46600.md) | High | Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage | 7.5 | 0.0055 | | | [CVE-2026-111943](https://patchblox.com/security/data/cve/CVE-2026-111943.md) | High | Go: CVE-2026-111943 Distrust compromised intermediate certificates in crypto/x509 | 8.1 | 0.0040 | | | [CVE-2026-56858](https://patchblox.com/security/data/cve/CVE-2026-56858.md) | High | Fix Javascript regexp context tracking in html/template | 8.8 | 0.0031 | | | [CVE-2026-56864](https://patchblox.com/security/data/cve/CVE-2026-56864.md) | High | Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb | 7.5 | 0.0030 | | | [CVE-2026-39822](https://patchblox.com/security/data/cve/CVE-2026-39822.md) | High | Root escape via symlink plus trailing slash in os | 8.2 | 0.0023 | | | [CVE-2026-56865](https://patchblox.com/security/data/cve/CVE-2026-56865.md) | High | Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog | 8.4 | 0.0013 | | | [CVE-2026-94447](https://patchblox.com/security/data/cve/CVE-2026-94447.md) | High | Checksum database bypass for golang.org/toolchain in cmd/go | 7.8 | 0.0010 | | | [CVE-2026-94444](https://patchblox.com/security/data/cve/CVE-2026-94444.md) | High | Checksum bypass for golang.org/fips140 in cmd/go | 7.8 | 0.0010 | | | [CVE-2026-42505](https://patchblox.com/security/data/cve/CVE-2026-42505.md) | Routine | Invoking Encrypted Client Hello privacy leak in crypto/tls | 5.3 | 0.0038 | | | [CVE-2026-94448](https://patchblox.com/security/data/cve/CVE-2026-94448.md) | Routine | Reset context tracking on consecutive template expressions in html/template | 6.1 | 0.0029 | | | [CVE-2026-97030](https://patchblox.com/security/data/cve/CVE-2026-97030.md) | Routine | Recognize yield as regexp preceder keyword in html/template | 6.1 | 0.0029 | | --- Data as of 2026-11-11T13:47:35Z UTC. 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