CVE catalog
CVE-2026-27145
(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the sam
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.59% · Oct 25, 2026
(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | golang-1.19 | bookworm | 1.19.8-2 | vulnerable |
| Cpe | golang-1.19 | Not reported | Not reported | vulnerable |
| Suse | go1.26-openssl | linux enterprise module for development tools 15 sp7 | 1.26.5-150600.13.9.1 | fixed |
| Suse | go1.26-openssl | linux enterprise server 15 sp6-ltss | 1.26.5-150600.13.9.1 | fixed |
| Suse | go1.26-openssl | linux enterprise server for sap applications 15 sp6 | 1.26.5-150600.13.9.1 | fixed |
| Suse | go1.26-openssl | linux enterprise high performance computing 15 sp4-espos | 1.26.5-150000.1.12.1 | fixed |
| Suse | go1.26-openssl | linux enterprise high performance computing 15 sp4-ltss | 1.26.5-150000.1.12.1 | fixed |
| Suse | go1.26-openssl | linux enterprise high performance computing 15 sp5-espos | 1.26.5-150000.1.12.1 | fixed |
| Suse | go1.26-openssl | linux enterprise high performance computing 15 sp5-ltss | 1.26.5-150000.1.12.1 | fixed |
| Suse | go1.26-openssl | linux enterprise server 15 sp4-ltss | 1.26.5-150000.1.12.1 | fixed |
| Suse | go1.26-openssl | linux enterprise server 15 sp5-ltss | 1.26.5-150000.1.12.1 | fixed |
| Suse | go1.26-openssl | linux enterprise server for sap applications 15 sp4 | 1.26.5-150000.1.12.1 | fixed |
| Suse | go1.26-openssl | linux enterprise server for sap applications 15 sp5 | 1.26.5-150000.1.12.1 | fixed |
| Opensuse | go1.25 | leap 16.0 | 1.25.11-160000.1.1 | fixed |
| Suse | go1.25 | linux enterprise server 16.0 | 1.25.11-160000.1.1 | fixed |
| Suse | go1.25 | linux enterprise server for sap applications 16.0 | 1.25.11-160000.1.1 | fixed |
| Opensuse | go1.26 | leap 16.0 | 1.26.4-160000.1.1 | fixed |
| Suse | go1.26 | linux enterprise server 16.0 | 1.26.4-160000.1.1 | fixed |
| Suse | go1.26 | linux enterprise server for sap applications 16.0 | 1.26.4-160000.1.1 | fixed |
| Suse | go1.26 | linux enterprise module for development tools 15 sp7 | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise high performance computing 15 sp4-espos | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise high performance computing 15 sp4-ltss | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise high performance computing 15 sp5-espos | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise high performance computing 15 sp5-ltss | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise server 15 sp4-ltss | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise server 15 sp5-ltss | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise server 15 sp6-ltss | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise server for sap applications 15 sp4 | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise server for sap applications 15 sp5 | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.26 | linux enterprise server for sap applications 15 sp6 | 1.26.4-150000.1.15.1 | fixed |
| Suse | go1.25 | linux enterprise module for development tools 15 sp7 | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise high performance computing 15 sp4-espos | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise high performance computing 15 sp4-ltss | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise high performance computing 15 sp5-espos | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise high performance computing 15 sp5-ltss | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise server 15 sp4-ltss | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise server 15 sp5-ltss | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise server 15 sp6-ltss | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise server for sap applications 15 sp4 | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise server for sap applications 15 sp5 | 1.25.11-150000.1.41.1 | fixed |
| Suse | go1.25 | linux enterprise server for sap applications 15 sp6 | 1.25.11-150000.1.41.1 | fixed |
| Opensuse | rclone | tumbleweed | 1.74.3-1.1 | fixed |
| Opensuse | go1.26 | tumbleweed | 1.26.4-1.1 | fixed |
| Opensuse | go1.25 | tumbleweed | 1.25.11-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | golang-1.19 | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise module for development tools 15 sp7 | 1.26.5-150600.13.9.1 | Not reported | SUSE-SU-2026:3102-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise server 15 sp6-ltss | 1.26.5-150600.13.9.1 | Not reported | SUSE-SU-2026:3102-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise server for sap applications 15 sp6 | 1.26.5-150600.13.9.1 | Not reported | SUSE-SU-2026:3102-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise high performance computing 15 sp4-espos | 1.26.5-150000.1.12.1 | Not reported | SUSE-SU-2026:3047-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise high performance computing 15 sp4-ltss | 1.26.5-150000.1.12.1 | Not reported | SUSE-SU-2026:3047-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise high performance computing 15 sp5-espos | 1.26.5-150000.1.12.1 | Not reported | SUSE-SU-2026:3047-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise high performance computing 15 sp5-ltss | 1.26.5-150000.1.12.1 | Not reported | SUSE-SU-2026:3047-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise server 15 sp4-ltss | 1.26.5-150000.1.12.1 | Not reported | SUSE-SU-2026:3047-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise server 15 sp5-ltss | 1.26.5-150000.1.12.1 | Not reported | SUSE-SU-2026:3047-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise server for sap applications 15 sp4 | 1.26.5-150000.1.12.1 | Not reported | SUSE-SU-2026:3047-1 | Not reported |
| Suse | go1.26-openssl | rpm | linux enterprise server for sap applications 15 sp5 | 1.26.5-150000.1.12.1 | Not reported | SUSE-SU-2026:3047-1 | Not reported |
| Opensuse | go1.25 | rpm | leap 16.0 | 1.25.11-160000.1.1 | Not reported | OPENSUSE-SU-2026:20977-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise server 16.0 | 1.25.11-160000.1.1 | Not reported | SUSE-SU-2026:22155-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise server for sap applications 16.0 | 1.25.11-160000.1.1 | Not reported | SUSE-SU-2026:22155-1 | Not reported |
| Opensuse | go1.26 | rpm | leap 16.0 | 1.26.4-160000.1.1 | Not reported | OPENSUSE-SU-2026:20976-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise server 16.0 | 1.26.4-160000.1.1 | Not reported | SUSE-SU-2026:22154-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise server for sap applications 16.0 | 1.26.4-160000.1.1 | Not reported | SUSE-SU-2026:22154-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise module for development tools 15 sp7 | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise high performance computing 15 sp4-espos | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise high performance computing 15 sp4-ltss | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise high performance computing 15 sp5-espos | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise high performance computing 15 sp5-ltss | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise server 15 sp4-ltss | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise server 15 sp5-ltss | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise server 15 sp6-ltss | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise server for sap applications 15 sp4 | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise server for sap applications 15 sp5 | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.26 | rpm | linux enterprise server for sap applications 15 sp6 | 1.26.4-150000.1.15.1 | Not reported | SUSE-SU-2026:2327-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise module for development tools 15 sp7 | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise high performance computing 15 sp4-espos | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise high performance computing 15 sp4-ltss | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise high performance computing 15 sp5-espos | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise high performance computing 15 sp5-ltss | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise server 15 sp4-ltss | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise server 15 sp5-ltss | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise server 15 sp6-ltss | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise server for sap applications 15 sp4 | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise server for sap applications 15 sp5 | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Suse | go1.25 | rpm | linux enterprise server for sap applications 15 sp6 | 1.25.11-150000.1.41.1 | Not reported | SUSE-SU-2026:2326-1 | Not reported |
| Opensuse | rclone | rpm | tumbleweed | 1.74.3-1.1 | Not reported | OPENSUSE-SU-2026:10975-1 | Not reported |
| Opensuse | go1.26 | rpm | tumbleweed | 1.26.4-1.1 | Not reported | OPENSUSE-SU-2026:10960-1 | Not reported |
| Opensuse | go1.25 | rpm | tumbleweed | 1.25.11-1.1 | Not reported | OPENSUSE-SU-2026:10959-1 | Not reported |
Notes
[bookworm] golang-1.19: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [golang-1.19]Affected
Details (2)
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
- [golang-1.19-doc]Affected
Source package: [golang-1.19]
Details (2)
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
- [golang-1.19-go]Affected
Source package: [golang-1.19]
Details (2)
1.19.8-2· amd64 · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
1.19.8-2· arm64 · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
- [golang-1.19-src]Affected
Source package: [golang-1.19]
Details (2)
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
[Debian 13 (Trixie)]
- [golang-1.24]Affected
Details (2)
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
- [golang-1.24-doc]Affected
Source package: [golang-1.24]
Details (2)
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
- [golang-1.24-go]Affected
Source package: [golang-1.24]
Details (2)
1.24.4-1· amd64 · trixieAffected
nvd · golang-1.24 · debian · 13
1.24.4-1· arm64 · trixieAffected
nvd · golang-1.24 · debian · 13
- [golang-1.24-src]Affected
Source package: [golang-1.24]
Details (2)
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
[openSUSE Tumbleweed]
- [go1.25-doc]Unknown
Source package: [go1.25]
Details (1)
1.25.14-1.1· x86_64 · tumbleweedUnknown · Fixed:
1.25.11-1.1Version impact unknown
nvd · go1.25 · opensuse · tumbleweed
- [go1.25-race]Unknown
Source package: [go1.25]
Details (1)
1.25.14-1.1· x86_64 · tumbleweedUnknown · Fixed:
1.25.11-1.1Version impact unknown
nvd · go1.25 · opensuse · tumbleweed
- [go1.26-doc]Unknown
Source package: [go1.26]
Details (1)
1.26.7-1.1· x86_64 · tumbleweedUnknown · Fixed:
1.26.4-1.1Version impact unknown
nvd · go1.26 · opensuse · tumbleweed
- [go1.26-race]Unknown
Source package: [go1.26]
Details (1)
1.26.7-1.1· x86_64 · tumbleweedUnknown · Fixed:
1.26.4-1.1Version impact unknown
nvd · go1.26 · opensuse · tumbleweed
- [rclone-bash-completion]Unknown
Source package: [rclone]
Details (1)
1.75.0-1.1· noarch · tumbleweedUnknown · Fixed:
1.74.3-1.1Version impact unknown
nvd · rclone · opensuse · tumbleweed
- [rclone-zsh-completion]Unknown
Source package: [rclone]
Details (1)
1.75.0-1.1· noarch · tumbleweedUnknown · Fixed:
1.74.3-1.1Version impact unknown
nvd · rclone · opensuse · tumbleweed
- [go1.25]Fixed
Source package: [go1.25]
Details (1)
1.25.14-1.1· x86_64 · tumbleweedFixed · Fixed:
1.25.11-1.1nvd · go1.25 · opensuse · tumbleweed
- [go1.26]Fixed
Source package: [go1.26]
Details (1)
1.26.7-1.1· x86_64 · tumbleweedFixed · Fixed:
1.26.4-1.1nvd · go1.26 · opensuse · tumbleweed
- [rclone]Fixed
Source package: [rclone]
Details (1)
1.75.0-1.1· x86_64 · tumbleweedFixed · Fixed:
1.74.3-1.1nvd · rclone · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_35832.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-27145]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-27145]
- [https://osv.dev/vulnerability/SUSE-SU-2026:22154-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:22155-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:2326-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:2327-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:3047-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:3102-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10959-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10960-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10975-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:20976-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:20977-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-27145]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27145.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1776.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]