Renovate: Update go toolchain directive to v1.26.3 [SECURITY]#152
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Renovate: Update go toolchain directive to v1.26.3 [SECURITY]#152renovate[bot] wants to merge 1 commit into
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This PR contains the following updates:
1.26.0→1.26.3Incorrect enforcement of email constraints in crypto/x509
BIT-golang-2026-27137 / CVE-2026-27137 / GO-2026-4599
More information
Details
When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Panic in name constraint checking for malformed certificates in crypto/x509
BIT-golang-2026-27138 / CVE-2026-27138 / GO-2026-4600
More information
Details
Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Incorrect parsing of IPv6 host literals in net/url
BIT-golang-2026-25679 / CVE-2026-25679 / GO-2026-4601
More information
Details
url.Parse insufficiently validated the host/authority component and accepted some invalid URLs.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
FileInfo can escape from a Root in os
BIT-golang-2026-27139 / CVE-2026-27139 / GO-2026-4602
More information
Details
On Unix platforms, when listing the contents of a directory using File.ReadDir or File.Readdir the returned FileInfo could reference a file outside of the Root in which the File was opened.
The impact of this escape is limited to reading metadata provided by lstat from arbitrary locations on the filesystem without permitting reading or writing files outside the root.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
URLs in meta content attribute actions are not escaped in html/template
BIT-golang-2026-27142 / CVE-2026-27142 / GO-2026-4603
More information
Details
Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS if the meta tag also has an http-equiv attribute with the value "refresh".
A new GODEBUG setting has been added, htmlmetacontenturlescape, which can be used to disable escaping URLs in actions in the meta content attribute which follow "url=" by setting htmlmetacontenturlescape=0.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
TOCTOU permits root escape on Linux via Root.Chmod in os in internal/syscall/unix
BIT-golang-2026-32282 / CVE-2026-32282 / GO-2026-4864
More information
Details
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
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
JsBraceDepth Context Tracking Bugs (XSS) in html/template
BIT-golang-2026-32289 / CVE-2026-32289 / GO-2026-4865
More information
Details
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
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
BIT-golang-2026-33810 / CVE-2026-33810 / GO-2026-4866
More information
Details
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
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Unbounded allocation for old GNU sparse in archive/tar
BIT-golang-2026-32288 / CVE-2026-32288 / GO-2026-4869
More information
Details
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
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls
BIT-golang-2026-32283 / CVE-2026-32283 / GO-2026-4870
More information
Details
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
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Inefficient policy validation in crypto/x509
BIT-golang-2026-32281 / CVE-2026-32281 / GO-2026-4946
More information
Details
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
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Unexpected work during chain building in crypto/x509
BIT-golang-2026-32280 / CVE-2026-32280 / GO-2026-4947
More information
Details
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
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net
BIT-golang-2026-33814 / CVE-2026-33814 / GO-2026-4918
More information
Details
When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Panic in Dial and LookupPort when handling NUL byte on Windows in net
BIT-golang-2026-39836 / CVE-2026-39836 / GO-2026-4971
More information
Details
The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputil
BIT-golang-2026-39825 / CVE-2026-39825 / GO-2026-4976
More information
Details
ReverseProxy can forward queries containing parameters not visible to Rewrite functions.
When used with a Rewrite function, or a Director function which parses query parameters, ReverseProxy sanitizes the forwarded request to remove query parameters which are not parsed by url.ParseQuery. ReverseProxy does not take ParseQuery's limit on the total number of query parameters (controlled by GODEBUG=urlmaxqueryparams=N) into account. This can permit ReverseProxy to forward a request containing a query parameter that is not visible to the Rewrite function.
For example, the query "a1=x&a2=x&...&a10000=x&hidden=y" can forward the parameter "hidden=y" while hiding it from the proxy's Rewrite function.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Quadratic string concatenation in consumePhrase in net/mail
BIT-golang-2026-42499 / CVE-2026-42499 / GO-2026-4977
More information
Details
Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Escaper bypass leads to XSS in html/template
BIT-golang-2026-39826 / CVE-2026-39826 / GO-2026-4980
More information
Details
If a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the <script> block.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Crash when handling long CNAME response in net
BIT-golang-2026-33811 / CVE-2026-33811 / GO-2026-4981
More information
Details
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Bypass of meta content URL escaping causes XSS in html/template
BIT-golang-2026-39823 / CVE-2026-39823 / GO-2026-4982
More information
Details
CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a tag's attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the attribute, the escaper would fail to similarly escape it, leading to XSS.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Quadratic string concatentation in consumeComment in net/mail
BIT-golang-2026-39820 / CVE-2026-39820 / GO-2026-4986
More information
Details
Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Release Notes
golang/go (go)
v1.26.3v1.26.2v1.26.1Configuration
📅 Schedule: (UTC)
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
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