ESB-2026.4191 — Vulnetix

ESB-2026.4191 PUBLISHED CVSS 9 CRITICAL

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4191 golang security update 24 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: golang Publisher: Red Hat Operating System: Red Hat Resolution: Patch/Upgrade CVE Names: CVE-2026-27140 CVE-2026-27143 CVE-2026-27144 CVE-2026-32280 CVE-2026-32282 CVE-2026-32283 Original Bulletin: https://access.redhat.com/errata/RHSA-2026:10217 Comment: CVSS (Max): 9.0 CVE-2026-27140 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H) CVSS Source: NIST, [Red Hat] Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H EPSS (Max): 0.0% (4th) CVE-2026-27143 2026-04-23 - --------------------------BEGIN INCLUDED TEXT-------------------- RHSA-2026:10217 - Security Advisory Issued: 2026-04-23 Updated: 2026-04-23 Synopsis Golang security update Type/Severity Security Advisory: Important Topic An update for golang is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Description The golang packages provide the Go programming language compiler. Security Fix(es): o golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282) o crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283) o crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280) o golang: cmd/compile: no-op interface conversion bypasses overlap checking (CVE-2026-27144) o cmd/go: golang: Go (golang) and cmd/go: Arbitrary Code Execution via malicious SWIG file names (CVE-2026-27140) o golang: cmd/compile: possible memory corruption after bound check elimination (CVE-2026-27143) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products o Red Hat Enterprise Linux for x86_64 10 x86_64 o Red Hat Enterprise Linux for IBM z Systems 10 s390x o Red Hat Enterprise Linux for Power, little endian 10 ppc64le o Red Hat Enterprise Linux for ARM 64 10 aarch64 Fixes o BZ - 2456336 - CVE-2026-32282 golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root o BZ - 2456339 - CVE-2026-32280 crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building o BZ - 2456340 - CVE-2026-27144 golang: cmd/compile: no-op interface conversion bypasses overlap checking o BZ - 2456341 - CVE-2026-27140 cmd/go: golang: Go (golang) and cmd/go: Arbitrary Code Execution via malicious SWIG file names o BZ - 2456342 - CVE-2026-27143 golang: cmd/compile: possible memory corruption after bound check elimination o RHEL-169928 - Update Go to version 1.25.9+2 [rhel-10.1.z] CVEs o CVE-2026-27140 o CVE-2026-27143 o CVE-2026-27144 o CVE-2026-32280 o CVE-2026-32282 o CVE-2026-32283 References o https://access.redhat.com/security/updates/classification/#important - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions
Red Hat	golang

Timeline

Apr 24, 2026 CVE Published
Apr 24, 2026 Distribution Patch

References

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