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Go go1.26rc1

Go: go1.26rc1 Release

Release date:
December 16, 2025
Previous version:
go1.25.7 (released February 4, 2026)
Magnitude:
1,702 Diff Delta
Contributors:
11 total committers
Data confidence:
Commits:
25 impacting commits

34 Features Released with go1.26rc1

os: on windows RemoveAll removing directories containing read-only files errors with `unlinkat ... Access is denied`
#75922
crypto/x509: panic when validating certificates with DSA public keys (CVE-2025-58188)
#75675
crypto/x509: excluded subdomain constraint doesn't preclude wildcard SAN (CVE-2025-61727)
#76442
encoding/pem: regression when decoding blocks with leading garbage [1.24 backport]
#75951
net/http: `CrossOriginProtection` insecure bypass patterns not limited to exact matches
#75054
encoding/pem: quadratic complexity when parsing some invalid inputs (CVE-2025-61723)
#75676
os: File.Seek doesn't set the correct offset with Windows overlapped handles [1.25 backport]
#75083
crypto/internal/fips140/rsa: requires a panic if self-tests fail [1.25 backport]
#75524
crypto/tls: earlyTrafficSecret should use ClientHelloInner if ECH enabled
#76283
go/token: small typo in `AddExistingFiles` method of `FileSet`
#75632
net/url: ipv4 mapped ipv6 addresses should be valid in square brackets
#75815
crypto/tls: ALPN negotiation error contains attacker controlled information
#75652
os: `Root.OpenRoot` sets incorrect name, losing prefix of original root
#73868
runtime: build fails when run via QEMU for linux/amd64 running on linux/arm64
#69255
debug/pe: pe.Open fails on object files produced by llvm-mingw 21
#75219
testing/synctest: test timeout with no runnable goroutines
#75134
net/http: internal error: connCount underflow
#61474
context: Err can return non-nil before Done channel is closed
#75533
sync/atomic: comment for Uintptr.Or incorrectly describes return value
#75607
crypto/internal/fips140/subtle: Go 1.25 subtle.xorBytes panic on MIPS
#74998
archive/tar: unbounded allocation when parsing GNU sparse map (CVE-2025-58183)
#75677
net/mail: excessive CPU consumption in ParseAddress (CVE-2025-61725)
#75680
net/textproto: excessive CPU consumption in Reader.ReadResponse (CVE-2025-61724)
#75716
net/url: insufficient validation of bracketed IPv6 hostnames (CVE-2025-47912)
#75678
encoding/asn1: pre-allocating memory when parsing DER payload can cause memory exhaustion (CVE-2025-58185)
#75671
net/http: lack of limit when parsing cookies can cause memory exhaustion (CVE-2025-58186)
#75672
cmd/compile: internal compiler error with GOEXPERIMENT=cgocheck2 on github.com/leodido/go-urn [1.25 backport]
#75595
spec: Go1.25 spec should be dated closer to actual release date
#75743
mime: FormatMediaType and ParseMediaType not compatible across 1.24 to 1.25
#76236
encoding/pem: malformed line endings can cause panics [1.25 backport]
#76029

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Top Contributors in go1.26rc1

rolandshoemaker
qmuntal
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