DEBIAN-CVE-2026-27145

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Source
https://security-tracker.debian.org/tracker/CVE-2026-27145
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27145.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-27145
Upstream
  • CVE-2026-27145
Published
2026-06-02T23:16:35Z
Modified
2026-09-19T22:47:40Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
Summary
[none]
Details

(*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.

References

Affected packages

Debian:12 / golang-1.19

Package

Name
golang-1.19
Purl
pkg:deb/debian/golang-1.19?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.19.8-2
1.19.9-1
1.19.10-1
1.19.10-2
1.19.11-1
1.19.12-1
1.19.12-2~bpo11+1
1.19.12-2~bpo12+1
1.19.12-2
1.19.13-1~bpo11+1
1.19.13-1~bpo12+1
1.19.13-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27145.json"

Debian:13 / golang-1.24

Package

Name
golang-1.24
Purl
pkg:deb/debian/golang-1.24?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.24.4-1
1.24.4-2
1.24.4-3
1.24.4-4
1.24.7-1
1.24.8-1
1.24.9-1
1.24.12-1
1.24.13-1
1.24.13-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27145.json"

Debian:14 / golang-1.25

Package

Name
golang-1.25
Purl
pkg:deb/debian/golang-1.25?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.25.11-1

Affected versions

1.*
1.25.0-1
1.25.0-2
1.25.1-1
1.25.2-1
1.25.3-1
1.25.6-1
1.25.7-1
1.25.7-2
1.25.8-1
1.25.9-1
1.25.10-1~bpo13+1
1.25.10-1
1.25.10-2~bpo13+1
1.25.10-2
1.25.11-1~bpo13+1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27145.json"

Debian:14 / golang-1.26

Package

Name
golang-1.26
Purl
pkg:deb/debian/golang-1.26?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.26.4-1

Affected versions

1.*
1.26~rc2-1
1.26~rc3-1
1.26~rc3-2
1.26.0-1
1.26.1-1
1.26.2-1
1.26.2-2
1.26.2-3
1.26.3-1~bpo13+1
1.26.3-1
1.26.3-2~bpo13+1
1.26.3-2
1.26.4-1~bpo13+1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27145.json"