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WID-SEC-W-2026-1006
Vulnerability from csaf_certbund - Published: 2026-04-07 22:00 - Updated: 2026-04-09 22:00Summary
Golang Go: Mehrere Schwachstellen
Severity
Hoch
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung: Go ist eine quelloffene Programmiersprache.
Angriff: Ein Angreifer kann mehrere Schwachstellen in Golang Go ausnutzen, um Speicherbeschädigungen zu verursachen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand auszulösen oder andere, nicht näher spezifizierte Angriffe durchzuführen.
Betroffene Betriebssysteme: - Sonstiges
- UNIX
- Windows
References
{
"document": {
"aggregate_severity": {
"text": "hoch"
},
"category": "csaf_base",
"csaf_version": "2.0",
"distribution": {
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "de-DE",
"notes": [
{
"category": "legal_disclaimer",
"text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
},
{
"category": "description",
"text": "Go ist eine quelloffene Programmiersprache.",
"title": "Produktbeschreibung"
},
{
"category": "summary",
"text": "Ein Angreifer kann mehrere Schwachstellen in Golang Go ausnutzen, um Speicherbesch\u00e4digungen zu verursachen, beliebigen Code auszuf\u00fchren, Sicherheitsma\u00dfnahmen zu umgehen, einen Denial-of-Service-Zustand auszul\u00f6sen oder andere, nicht n\u00e4her spezifizierte Angriffe durchzuf\u00fchren.",
"title": "Angriff"
},
{
"category": "general",
"text": "- Sonstiges\n- UNIX\n- Windows",
"title": "Betroffene Betriebssysteme"
}
],
"publisher": {
"category": "other",
"contact_details": "csaf-provider@cert-bund.de",
"name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
"namespace": "https://www.bsi.bund.de"
},
"references": [
{
"category": "self",
"summary": "WID-SEC-W-2026-1006 - CSAF Version",
"url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1006.json"
},
{
"category": "self",
"summary": "WID-SEC-2026-1006 - Portal Version",
"url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1006"
},
{
"category": "external",
"summary": "Go 1.26.2 and Go 1.25.9 releases vom 2026-04-07",
"url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
}
],
"source_lang": "en-US",
"title": "Golang Go: Mehrere Schwachstellen",
"tracking": {
"current_release_date": "2026-04-09T22:00:00.000+00:00",
"generator": {
"date": "2026-04-10T07:05:07.518+00:00",
"engine": {
"name": "BSI-WID",
"version": "1.5.0"
}
},
"id": "WID-SEC-W-2026-1006",
"initial_release_date": "2026-04-07T22:00:00.000+00:00",
"revision_history": [
{
"date": "2026-04-07T22:00:00.000+00:00",
"number": "1",
"summary": "Initiale Fassung"
},
{
"date": "2026-04-09T22:00:00.000+00:00",
"number": "2",
"summary": "Referenz(en) aufgenommen: 2456336"
}
],
"status": "final",
"version": "2"
}
},
"product_tree": {
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"category": "product_version_range",
"name": "\u003c1.26.2",
"product": {
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"product_id": "T052518"
}
},
{
"category": "product_version",
"name": "1.26.2",
"product": {
"name": "Golang Go 1.26.2",
"product_id": "T052518-fixed",
"product_identification_helper": {
"cpe": "cpe:/a:golang:go:1.26.2"
}
}
},
{
"category": "product_version_range",
"name": "\u003c1.25.9",
"product": {
"name": "Golang Go \u003c1.25.9",
"product_id": "T052519"
}
},
{
"category": "product_version",
"name": "1.25.9",
"product": {
"name": "Golang Go 1.25.9",
"product_id": "T052519-fixed",
"product_identification_helper": {
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}
}
}
],
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"name": "Go"
}
],
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"name": "Golang"
}
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},
"vulnerabilities": [
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"cve": "CVE-2026-27140",
"product_status": {
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"T052518"
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},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-27140"
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"cve": "CVE-2026-27143",
"product_status": {
"known_affected": [
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"T052518"
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},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-27143"
},
{
"cve": "CVE-2026-27144",
"product_status": {
"known_affected": [
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"T052518"
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},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-27144"
},
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"product_status": {
"known_affected": [
"T052519",
"T052518"
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},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-32280"
},
{
"cve": "CVE-2026-32281",
"product_status": {
"known_affected": [
"T052519",
"T052518"
]
},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-32281"
},
{
"cve": "CVE-2026-32282",
"product_status": {
"known_affected": [
"T052519",
"T052518"
]
},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-32282"
},
{
"cve": "CVE-2026-32283",
"product_status": {
"known_affected": [
"T052519",
"T052518"
]
},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-32283"
},
{
"cve": "CVE-2026-32288",
"product_status": {
"known_affected": [
"T052519",
"T052518"
]
},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-32288"
},
{
"cve": "CVE-2026-32289",
"product_status": {
"known_affected": [
"T052519",
"T052518"
]
},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-32289"
},
{
"cve": "CVE-2026-33810",
"product_status": {
"known_affected": [
"T052519",
"T052518"
]
},
"release_date": "2026-04-07T22:00:00.000+00:00",
"title": "CVE-2026-33810"
}
]
}
CVE-2026-27140 (GCVE-0-2026-27140)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 13:22
VLAI?
EPSS
Title
Code execution vulnerability in SWIG code generation in cmd/go
Summary
SWIG file names containing 'cgo' and well-crafted payloads could lead to code smuggling and arbitrary code execution at build time due to trust layer bypass.
Severity ?
8.8 (High)
CWE
- CWE-501 - Trust Boundary Violation
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
Juho Forsén of Mattermost
{
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
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"timestamp": "2026-04-09T03:55:58.901718Z",
"version": "2.0.3"
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"dateUpdated": "2026-04-13T13:22:34.117Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"title": "CISA ADP Vulnrichment"
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{
"url": "https://go.dev/issue/78335"
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{
"url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
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CVE-2026-32280 (GCVE-0-2026-32280)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-08 17:46
VLAI?
EPSS
Title
Unexpected work during chain building in crypto/x509
Summary
During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 and users of crypto/tls.
Severity ?
7.5 (High)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | crypto/x509 |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
Jakub Ciolek - https://ciolek.dev
{
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"integrityImpact": "NONE",
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{
"name": "Certificate.buildChains"
},
{
"name": "Certificate.Verify"
}
],
"vendor": "Go standard library",
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"status": "affected",
"version": "0",
"versionType": "semver"
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},
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"url": "https://go.dev/issue/78282"
},
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"url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
},
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"url": "https://pkg.go.dev/vuln/GO-2026-4947"
}
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"title": "Unexpected work during chain building in crypto/x509"
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CVE-2026-32289 (GCVE-0-2026-32289)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 18:20
VLAI?
EPSS
Title
JsBraceDepth Context Tracking Bugs (XSS) in html/template
Summary
Context was not properly tracked across template branches for JS template literals, leading to possibly incorrect escaping of content when branches were used. Additionally template actions within JS template literals did not properly track the brace depth, leading to incorrect escaping being applied. These issues could cause actions within JS template literals to be incorrectly or improperly escaped, leading to XSS vulnerabilities.
Severity ?
6.1 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | html/template |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
{
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"integrityImpact": "LOW",
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},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "html/template",
"product": "html/template",
"programRoutines": [
{
"name": "context.String"
},
{
"name": "context.mangle"
},
{
"name": "escaper.escapeBranch"
},
{
"name": "Error.Error"
},
{
"name": "HTMLEscaper"
},
{
"name": "JSEscape"
},
{
"name": "JSEscapeString"
},
{
"name": "JSEscaper"
},
{
"name": "ParseFS"
},
{
"name": "ParseFiles"
},
{
"name": "ParseGlob"
},
{
"name": "Template.AddParseTree"
},
{
"name": "Template.Clone"
},
{
"name": "Template.DefinedTemplates"
},
{
"name": "Template.Execute"
},
{
"name": "Template.ExecuteTemplate"
},
{
"name": "Template.Funcs"
},
{
"name": "Template.Parse"
},
{
"name": "Template.ParseFS"
},
{
"name": "Template.ParseFiles"
},
{
"name": "Template.ParseGlob"
},
{
"name": "URLQueryEscaper"
}
],
"vendor": "Go standard library",
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{
"lessThan": "1.25.9",
"status": "affected",
"version": "0",
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},
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"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
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{
"lang": "en",
"value": "Context was not properly tracked across template branches for JS template literals, leading to possibly incorrect escaping of content when branches were used. Additionally template actions within JS template literals did not properly track the brace depth, leading to incorrect escaping being applied. These issues could cause actions within JS template literals to be incorrectly or improperly escaped, leading to XSS vulnerabilities."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"lang": "en"
}
]
}
],
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},
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"url": "https://go.dev/issue/78331"
},
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"url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
},
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"title": "JsBraceDepth Context Tracking Bugs (XSS) in html/template"
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"state": "PUBLISHED"
},
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CVE-2026-32282 (GCVE-0-2026-32282)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 18:20
VLAI?
EPSS
Title
TOCTOU permits root escape on Linux via Root.Chmod in os in internal/syscall/unix
Summary
On Linux, if the target of Root.Chmod is replaced with a symlink while the chmod operation is in progress, Chmod can operate on the target of the symlink, even when the target lies outside the root. The Linux fchmodat syscall silently ignores the AT_SYMLINK_NOFOLLOW flag, which Root.Chmod uses to avoid symlink traversal. Root.Chmod checks its target before acting and returns an error if the target is a symlink lying outside the root, so the impact is limited to cases where the target is replaced with a symlink between the check and operation.
Severity ?
6.4 (Medium)
CWE
- CWE-61 - UNIX Symbolic Link (Symlink) Following
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | internal/syscall/unix |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
Uuganbayar Lkhamsuren (https://github.com/uug4na)
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CVE-2026-33810 (GCVE-0-2026-33810)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-20 17:23
VLAI?
EPSS
Title
Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
Summary
When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
Severity ?
7.5 (High)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | crypto/x509 |
Affected:
1.26.0-0 , < 1.26.2
(semver)
|
Credits
Riyas from Saintgits College of Engineering
k1rnt
@1seal
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CVE-2026-32283 (GCVE-0-2026-32283)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 18:19
VLAI?
EPSS
Title
Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls
Summary
If one side of the TLS connection sends multiple key update messages post-handshake in a single record, the connection can deadlock, causing uncontrolled consumption of resources. This can lead to a denial of service. This only affects TLS 1.3.
Severity ?
7.5 (High)
CWE
- CWE-667 - Improper Locking
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | crypto/tls |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
Jakub Ciolek - https://ciolek.dev/
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CVE-2026-32288 (GCVE-0-2026-32288)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 18:20
VLAI?
EPSS
Title
Unbounded allocation for old GNU sparse in archive/tar
Summary
tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the "old GNU sparse map" format.
Severity ?
5.5 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | archive/tar |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
Colin Walters (walters@verbum.org)
Uuganbayar Lkhamsuren (https://github.com/uug4na)
Jakub Ciolek
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CVE-2026-27144 (GCVE-0-2026-27144)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 18:20
VLAI?
EPSS
Title
Miscompilation allows memory corruption via CONVNOP-wrapped array copy in cmd/compile
Summary
The compiler is meant to unwrap pointers which are the operands of a memory move; a no-op interface conversion prevented the compiler from making the correct determination about non-overlapping moves, potentially leading to memory corruption at runtime.
Severity ?
7.1 (High)
CWE
- CWE-440 - Expected Behavior Violation
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go toolchain | cmd/compile |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
Jakub Ciolek - https://ciolek.dev/
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},
{
"url": "https://go.dev/issue/78371"
},
{
"url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4867"
}
],
"title": "Miscompilation allows memory corruption via CONVNOP-wrapped array copy in cmd/compile"
}
},
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CVE-2026-32281 (GCVE-0-2026-32281)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 18:19
VLAI?
EPSS
Title
Inefficient policy validation in crypto/x509
Summary
Validating certificate chains which use policies is unexpectedly inefficient when certificates in the chain contain a very large number of policy mappings, possibly causing denial of service. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
Severity ?
7.5 (High)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | crypto/x509 |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
Jakub Ciolek - https://ciolek.dev
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}
],
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CVE-2026-27143 (GCVE-0-2026-27143)
Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 18:20
VLAI?
EPSS
Title
Missing bound checks can lead to memory corruption in safe Go in cmd/compile
Summary
Arithmetic over induction variables in loops were not correctly checked for underflow or overflow. As a result, the compiler would allow for invalid indexing to occur at runtime, potentially leading to memory corruption.
Severity ?
9.8 (Critical)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go toolchain | cmd/compile |
Affected:
0 , < 1.25.9
(semver)
Affected: 1.26.0-0 , < 1.26.2 (semver) |
Credits
Jakub Ciolek - https://ciolek.dev/
{
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}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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