SUSE-SU-2026:23301-1: important: Security update for go1.26
SLE-SECURITY-UPDATES
null at suse.de
Mon Aug 31 13:05:39 UTC 2026
# Security update for go1.26
Announcement ID: SUSE-SU-2026:23301-1
Release Date: 2026-08-19T09:08:44Z
Rating: important
References:
* bsc#1255111
* bsc#1266609
* bsc#1275024
* bsc#1275025
* bsc#1275026
* bsc#1275028
* bsc#1275029
* bsc#1275032
* bsc#1275033
* bsc#1275034
Cross-References:
* CVE-2026-33818
* CVE-2026-39821
* CVE-2026-56853
* CVE-2026-56858
* CVE-2026-56859
* CVE-2026-56860
* CVE-2026-56862
* CVE-2026-56864
* CVE-2026-56865
CVSS scores:
* CVE-2026-33818 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-33818 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-39821 ( SUSE ): 9.1
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-39821 ( SUSE ): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
* CVE-2026-39821 ( NVD ): 8.2 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
* CVE-2026-39821 ( NVD ): 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
* CVE-2026-56853 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-56853 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-56858 ( SUSE ): 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
* CVE-2026-56858 ( NVD ): 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
* CVE-2026-56859 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-56859 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-56860 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
* CVE-2026-56860 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-56862 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-56862 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* CVE-2026-56864 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
* CVE-2026-56864 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
* CVE-2026-56865 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
* CVE-2026-56865 ( NVD ): 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products:
* SUSE Linux Enterprise Server 16.0
* SUSE Linux Enterprise Server for SAP applications 16.0
An update that solves nine vulnerabilities and has one fix can now be installed.
## Description:
This update for go1.26 fixes the following issues:
Update to go1.26.6 (released 2026-08-13, bsc#1255111).
Security issues fixed:
* CVE-2026-33818: encoding/asn1: unenforced recursion limit can lead to stack
exhaustion when parsing deeply-nested, recursive structures (bsc#1275034).
* CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only
Punycode-encoded labels allows for validation bypass and privilege
escalation (bsc#1266609).
* CVE-2026-56853: net/http: missing timeout when doing unencrypted HTTP/2
check can lead to a denial of service (bsc#1275028).
* CVE-2026-56858: html/template: improper Javascript regexp context tracking
allows for XSS attacks (bsc#1275033).
* CVE-2026-56859: encoding/xml: missing recursion depth guard during decode
operation can lead to stack exhaustion and a denial of service
(bsc#1275026).
* CVE-2026-56860: net/url: quadratic time complexity in `resolvePath` when
processing certain input can lead to high memory allocation overhead and a
denial of service (bsc#1275029).
* CVE-2026-56862: crypto/tls: no limit set for handshake messages sent post-
handshake allows for denial of service (bsc#1275032).
* CVE-2026-56864: x/mod/sumdb: unauthenticated hashes accepted in `Lookup`
allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious
module content (bsc#1275025).
* CVE-2026-56865: x/mod/sumdb/tlog: improper transparency log tile
verification allows for bypass on crafted input and can lead to malicious
module content to be accepted (bsc#1275024).
Changes for go1.26.6:
* go#79876 cmd/compile: prove misscompilation in slicemask folding leaves
garbage in the upper bits
* go#80099 cmd/compile: internal compiler error invalid heap allocated var
without Heapaddr
* go#80131 cmd/link: peCreateExportFile generates invalid .def file when
output name has trailing dot (c-shared on Windows)
* go#80365 os: Root's MkdirAll can't create paths ending in forward slashes
* go#80367 os: TestRootMultiReadFile fails on netbsd/arm64 after CL 797880
* go#80369 os: TestRootConsistencyRemoveAll fails on Plan 9 after CL 797880
* go#80394 runtime: arm64 found pointer to free object with safe code
* go#80441 runtime: uninitialized register due to wrong ABI in
mach_vm_region_trampoline leads to libc following garbage stack data as a
pointer
* go#80478 cmd/compile: riscv64 miscompiles struct copy, corrupting a []byte
slice field
* go#80499 runtime: js/wasm: "found bad pointer in Go heap" \-- link-layout-
constant value recorded as a pointer in the write-barrier buffer
* go#80579 cmd/compile: regalloc uses unreliable type data (like
v.Type.IsSigned()) to choose the restore of spills
* go#80606 crypto/tls: escape hatch for FIPS 140-3 mode Extended Master Secret
enforcement
* go#80609 net, x/net/dns/dnsmessage: panic when parsing invalid SVCB record
* go#80615 cmd/compile: mips64le misscompile OffPtr by a const which doesn't
fit 32bits resulting in panic
* go#80617 cmd/compile: mips/mips64, multiply/divide results spilled from
HI/LO corrupted w/ big stack frames
* go#80619 cmd/compile: prove bug causes invalid indirect call
* go#80715 runtime: fpTracebackPartialExpand SIGSEGV under high panic load
## Patch Instructions:
To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:
* SUSE Linux Enterprise Server for SAP applications 16.0
zypper in -t patch SUSE-SLES-16.0-1463=1
* SUSE Linux Enterprise Server 16.0
zypper in -t patch SUSE-SLES-16.0-1463=1
## Package List:
* SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
* go1.26-doc-1.26.6-160000.1.1
* go1.26-race-1.26.6-160000.1.1
* go1.26-1.26.6-160000.1.1
* SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
* go1.26-doc-1.26.6-160000.1.1
* go1.26-race-1.26.6-160000.1.1
* go1.26-1.26.6-160000.1.1
## References:
* https://www.suse.com/security/cve/CVE-2026-33818.html
* https://www.suse.com/security/cve/CVE-2026-39821.html
* https://www.suse.com/security/cve/CVE-2026-56853.html
* https://www.suse.com/security/cve/CVE-2026-56858.html
* https://www.suse.com/security/cve/CVE-2026-56859.html
* https://www.suse.com/security/cve/CVE-2026-56860.html
* https://www.suse.com/security/cve/CVE-2026-56862.html
* https://www.suse.com/security/cve/CVE-2026-56864.html
* https://www.suse.com/security/cve/CVE-2026-56865.html
* https://bugzilla.suse.com/show_bug.cgi?id=1255111
* https://bugzilla.suse.com/show_bug.cgi?id=1266609
* https://bugzilla.suse.com/show_bug.cgi?id=1275024
* https://bugzilla.suse.com/show_bug.cgi?id=1275025
* https://bugzilla.suse.com/show_bug.cgi?id=1275026
* https://bugzilla.suse.com/show_bug.cgi?id=1275028
* https://bugzilla.suse.com/show_bug.cgi?id=1275029
* https://bugzilla.suse.com/show_bug.cgi?id=1275032
* https://bugzilla.suse.com/show_bug.cgi?id=1275033
* https://bugzilla.suse.com/show_bug.cgi?id=1275034
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