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Message-ID: <82bd2839-9db9-4ab4-9a7a-915e225a4450@oracle.com>
Date: Wed, 8 Apr 2026 16:24:34 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: Go 1.26.2 and Go 1.25.9 are released with 10 security
fixes
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU announces:
> We have just released Go versions 1.26.2 and 1.25.9, minor point releases.
>
> These releases include 10 security fixes following the security policy:
>
> * os: Root.Chmod can follow symlinks out of the root on Linux
>
> On Linux, if the target of Root.Chmod is replaced with a symlink while
> the chmod operation is in progress, Chmod could 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.
>
> On Linux, Root.Chmod now uses the fchmodat2 syscall when available, and
> an workaround using /proc/self/fd otherwise.
>
> Thanks to Uuganbayar Lkhamsuren for reporting this issue.
>
> This is CVE-2026-32282 and Go issue https://go.dev/issue/78293.
>
> * html/template: JS template literal context incorrectly tracked
>
> 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.
>
> This only affects templates that use template actions within JS template
> literals.
>
> This is CVE-2026-32289 and Go issue https://go.dev/issue/78331.
>
> * crypto/x509: excluded DNS constraints not properly applied to wildcard
> domains
>
> 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.
>
> For example, if a certificate contains the DNS name "*.example.com" and the
> excluded DNS name "EXAMPLE.COM", the constraint will not be applied.
>
> 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.
>
> This issue only affects Go 1.26.
>
> Thank you to Riyas from Saintgits College of Engineering, k1rnt, @1seal
> for reporting this issue.
>
> This is CVE-2026-33810 and Go issue https://go.dev/issue/78332.
>
> * cmd/compile: no-op interface conversion bypasses overlap checking
>
> Previously, the compiler failed to unwrap pointers contained within
> a no-op interface conversion leading to an incorrect determination
> of a non-overlapping move.
>
> To prevent unsafe move operations, the compiler will now unwrap all
> such conversions before considering a move non-overlapping.
>
> Thank you to Jakub Ciolek - https://ciolek.dev/ for reporting this issue.
>
> This is CVE-2026-27144 and Go issue https://go.dev/issue/78371.
>
> * cmd/compile: possible memory corruption after bound check elimination
>
> Previously, slices and arrays accessed using induction variables
> were sometimes incorrectly proved in-bound. If the induction variable
> used for indexing were to overflow or underflow, it could allow access
> to memory beyond the scope of the original slice or array.
>
> To prevent this behavior, the compiler ensures that any mutated induction
> variable that overflows/underflows with respect to its loop condition
> is not used for bound check elimination.
>
> Thank you to Jakub Ciolek - https://ciolek.dev/ for reporting this issue.
>
> This is CVE-2026-27143 and Go issue https://go.dev/issue/78333.
>
> * archive/tar: unbounded allocation when parsing old format GNU sparse map
>
> tar.Reader could 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.
>
> We now limit both the number of old GNU sparse map extension blocks,
> and the total number of sparse file entries, regardless of encoding.
>
> Thanks to Colin Walters (wal...@...bum.org) who initially reported this
> issue.
> Thanks also to Uuganbayar Lkhamsuren (https://github.com/uug4na) and
> Jakub Ciolek who additionally reported this issue.
>
> This is CVE-2026-32288 and Go issue https://go.dev/issue/78301.
>
> * crypto/tls: multiple key update handshake messages can cause connection to
> deadlock
>
> 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.
>
> Thank you to Jakub Ciolek - https://ciolek.dev/ for reporting this issue.
>
> This is CVE-2026-32283 and Go issue https://go.dev/issue/78334.
>
> * cmd/go: trust layer bypass when using cgo and SWIG
>
> A well-crafted SWIG source file could take advantage
> of a file-naming convention used inside the trust
> boundary of the cgo compiler. Doing so could result
> in arbitrary code execution during build time.
>
> SWIG files are disallowed from using this convention.
>
> Thank you to Juho Forsén of Mattermost for reporting this issue.
>
> This is CVE-2026-27140 and Go issue https://go.dev/issue/78335.
>
> * crypto/x509: unexpected work during chain building
>
> 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.
>
> Thank you to Jakub Ciolek - https://ciolek.dev/ for reporting this issue.
>
> This is CVE-2026-32280 and Go issue https://go.dev/issue/78282.
>
> * crypto/x509: inefficient policy validation
>
> 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.
>
> Thank you to Jakub Ciolek - https://ciolek.dev/ for reporting this issue.
>
> This is CVE-2026-32281 and Go issue https://go.dev/issue/78281.
>
> View the release notes for more information:
> https://go.dev/doc/devel/release#go1.26.2
>
> You can download binary and source distributions from the Go website:
> https://go.dev/dl/
>
> To compile from source using a Git clone, update to the release with
> git checkout go1.26.2 and build as usual.
>
> Thanks to everyone who contributed to the releases.
>
> Cheers,
> David and Junyang for the Go team
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