go security

About this tag
The go security tag on WindowsForum.com covers vulnerabilities and security updates affecting the Go programming language and its ecosystem, with a focus on their impact on Windows-based infrastructure. Recent discussions include CVEs in Go's standard library and third-party packages, such as denial-of-service flaws in SSH (CVE-2026-39827), XSS in HTML parsing (CVE-2026-25681), log injection in net/textproto (CVE-2026-42507), infinite loops in XPath libraries (CVE-2026-32287, CVE-2026-4645), certificate verification panics (CVE-2026-27138), TOCTOU races in filesystem metadata (CVE-2026-27139), and template escaping issues (CVE-2026-27142). The tag emphasizes how these bugs affect Windows estates running Go-built services, agents, and tools, and provides guidance on patching priorities.

  1. CVE-2026-39827 Go SSH DoS: Memory Leak Crashes Windows-Based Services

    Microsoft’s Security Update Guide lists CVE-2026-39827 as a denial-of-service flaw in golang.org/x/crypto/ssh, where an authenticated SSH client can repeatedly open channels that a server rejects, leaking memory until the server process crashes. The Go security team disclosed the underlying...
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    • dependency management go security ssh denial of service windows patch triage
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    • Forum: Security Alerts

  2. CVE-2026-25681: Go x/net HTML XSS Fix for Windows-Hosted Apps

    Microsoft’s Security Update Guide entry for CVE-2026-25681, published after the Go project’s May 2026 x/net security update, tracks a medium-severity cross-site scripting flaw in golang.org/x/net/html before v0.55.0, where malformed DOCTYPE character references can produce an unsafe rendered...
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    • cve-2026-25681 dependency remediation go security html xss
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  3. CVE-2026-42507 Go net/textproto Log Injection: Windows Patch Priority Guide

    CVE-2026-42507 is a Go standard-library vulnerability published in early June 2026 in which net/textproto could include attacker-controlled input in error messages without escaping it, creating a path for misleading log entries or terminal-control injection in software that prints or records...
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    • cve 2026 42507 go security log injection windows administration
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    • Forum: Security Alerts

  4. CVE-2026-32287 Infinite Loop in antchfx/xpath: Enterprise DoS Risk

    Microsoft’s Security Update Guide has published CVE-2026-32287 for an infinite loop condition in github.com/antchfx/xpath, the Go XPath package used by a long tail of tools that query XML, HTML, and JSON content. That combination matters because parser bugs rarely stay confined to one app: once...
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    • antchfx xpath cve 2026 32287 denial of service go security
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  5. CVE-2026-4645 Go XPath DoS: boolean expressions can cause total availability loss

    A newly assigned CVE-2026-4645 affects the Go XPath library github.com/antchfx/xpath, and the issue is serious enough to be framed as a denial-of-service risk: specially crafted boolean XPath expressions can drive the component into total loss of availability. The vulnerability description...
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    • antchfx xpath cve-2026-4645 go security xpath denial of service
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  6. Go 1.26 CVE-2026-27138 X509 Verification Panic Fixed in 1.26.1

    A new security advisory affecting the Go standard library's crypto/x509 package — tracked as CVE-2026-27138 — warns that certificate chain verification can panic when an intermediate or leaf certificate contains an empty DNS name while another certificate in the same chain includes excluded name...
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    • certificate verification go security panic vulnerability x509 certificates
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  7. Go TOCTOU Fix in os Root Metadata: Update to Go 1.26.1

    The Go standard library has picked up a subtle but meaningful security fix: a time‑of‑check/time‑of‑use (TOCTOU) race in the os package could let a returned FileInfo refer to a file outside a previously opened Root, allowing an attacker to probe filesystem metadata outside the intended root. The...
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    • filesystem safety go security os package toctou vulnerability
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  8. Go html/template CVE-2026-27142: Meta Refresh XSS Fix in Go 1.26.1 and 1.25.8

    The Go standard library's html/template package has a newly disclosed security flaw — tracked as CVE-2026-27142 — that can leave web applications vulnerable to cross-site scripting (XSS) when untrusted values are templated into the content attribute of HTML meta tags, particularly those using...
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    • go security html template security updates xss vulnerability
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  9. Mitigating CVE-2023-24534: Go HTTP Header Parsing DoS and Patch Guide

    A subtle bug in the Go standard library’s HTTP and MIME header parsing — tracked as CVE-2023-24534 — allows specially crafted requests to force excessive memory allocation inside the net/http and net/textproto packages, producing a practical denial-of-service (DoS) vector that can exhaust...
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    • cve 2023 24534 go security http header memory dos
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    • Forum: Security Alerts

  10. CVE-2024-24791: Go net/http Expect 100-continue bug leads to proxy DoS

    Go’s net/http standard library contains a subtle protocol-handling bug — tracked as CVE-2024-24791 — that can be weaponized to cause sustained denial-of-service conditions against Go-based HTTP proxies and other components that reuse HTTP connections, and operators must treat it as a...
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    • denial of service expect continue go security http protocol
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  11. CVE-2024-37298 DoS in Gorilla Schema: Upgrade to v1.4.1 and Enable MaxSize

    A high‑severity denial‑of‑service vulnerability — tracked as CVE‑2024‑37298 — was disclosed in the popular Go library github.com/gorilla/schema, allowing an attacker to force unbounded memory allocations when the library decodes form or query parameters into structs that contain slices of nested...
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    • go security gorilla schema memory exhaustion upgrade v1.4.1
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  12. CVE-2021-33198: Go big.Rat parsing DoS fix

    A subtle parsing bug in Go’s standard library — specifically in the math/big package’s handling of rational numbers — could be weaponized to crash processes and deny service: inputs with excessively large exponents passed to (big.Rat).SetString or (big.Rat).UnmarshalText may trigger a panic or...
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    • big rat parsing cve 2021 33198 fuzzing testing go security
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  13. CVE-2023-39325: Go HTTP/2 Rapid Reset Fix and Azure Linux Attestation

    Go’s net/http HTTP/2 “rapid reset” weakness (CVE-2023-39325) is real, it was fixed upstream, and Microsoft’s short public mapping that “Azure Linux includes this open‑source library and is therefore potentially affected” is an authoritative product‑level attestation — but it is not a blanket...
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    • azure linux csaf attestations go security http2 vulnerability
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  14. Go Gob Decoder DoS: CVE-2024-34156 Stack Exhaustion and Mitigation

    A critical availability weakness in Go’s standard library — tracked as CVE-2024-34156 — lets an attacker reliably crash a process that decodes untrusted gob data by driving the decoder into stack exhaustion. The flaw is simple in concept but serious in consequence: calling encoding/gob’s...
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    • denial of service go security gob deserialization stack overflow
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  15. CVE-2024-27304: Critical Go pgx PostgreSQL protocol injection risk fixed

    A subtle arithmetic bug in a widely used Go PostgreSQL driver—pgx—turned into a critical SQL‑injection risk: if an attacker can force a single query or bind message to exceed 4 GB, a 32‑bit size calculation can wrap and let the attacker fragment and inject protocol messages, enabling arbitrary...
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    • go security pgx vulnerability postgresql protocol supply chain risks
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  16. Go gzip Reader DoS: CVE-2022-30631 Fixed in Go 1.17.12 and 1.18.4

    A simple, malformed gzip archive can still bring down a Go-based service: an uncontrolled recursion bug in Go’s standard library compress/gzip Reader.Read lets an attacker crash applications by exhausting the stack when parsing archives composed of many concatenated zero-length compressed files...
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    • cve 2022 30631 go security gzip vulnerability software update
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    • Forum: Security Alerts

  17. CVE-2016-3959: Go DSA Verify DoS Fix and Early Validation

    The Verify function in Go’s crypto/dsa implementation (crypto/dsa/dsa.go) contained an input‑validation flaw that could be weaponized to force an application into an infinite loop and an effective denial‑of‑service; the bug was tracked as CVE‑2016‑3959 and fixed in the emergency releases Go...
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    • cryptography denial of service dsa verification go security
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  18. Expr Recursion DoS: CVE-2025-68156 Patch and MaxDepth Guard

    Expr’s evaluator can be crashed by ordinary builtin calls: a newly assigned CVE shows several widely used functions in the Expr Go package performed unbounded recursion over user-supplied data and could exhaust the Go runtime stack, allowing attackers to cause a process-level denial of service...
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    • cve 2025 68156 go security maxdepth fix recursion dos
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  19. CVE-2023-45284: Azure Linux Attestation and Go IsLocal Risk on Windows

    Microsoft’s short advisory that “Azure Linux includes this open‑source library and is therefore potentially affected” is accurate — but it is a product‑scoped inventory statement, not a categorical guarantee that no other Microsoft product can include the same vulnerable Go library. Background /...
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    • azure linux cve 2023 45284 go security windows exposure
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  20. Logrus DoS Patch: Fix for 64 KB Line Token Break in Go Logging

    A denial-of-service flaw in the widely used Go logging library logrus can render Entry.Writer unusable when it receives a single-line log payload larger than 64 KB with no newline characters, creating the potential for sustained or persistent application unavailability until the library is...
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    • denial of service go security logging safety logrus vulnerability
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    • Forum: Security Alerts