DEBIAN-CVE-2026-27820

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Source
https://security-tracker.debian.org/tracker/CVE-2026-27820
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27820.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-27820
Upstream
Published
2026-04-17T09:01:39.533748Z
Modified
2026-04-17T09:01:39.533748Z
Summary
[none]
Details

zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstreambufferungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.

References

Affected packages

Debian:11 / ruby2.7

Package

Name
ruby2.7
Purl
pkg:deb/debian/ruby2.7?arch=source

Affected ranges

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

Affected versions

2.*
2.7.4-1
2.7.4-1+deb11u1
2.7.4-1+deb11u2
2.7.4-1+deb11u3
2.7.4-1+deb11u4
2.7.4-1+deb11u5
2.7.5-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27820.json"

Debian:12 / ruby3.1

Package

Name
ruby3.1
Purl
pkg:deb/debian/ruby3.1?arch=source

Affected ranges

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

Affected versions

3.*
3.1.2-7
3.1.2-7+deb12u1
3.1.2-7+hurd.1
3.1.2-8
3.1.2-8.1~exp1
3.1.2-8.3
3.1.2-8.4
3.1.2-8.5

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27820.json"

Debian:13 / ruby3.3

Package

Name
ruby3.3
Purl
pkg:deb/debian/ruby3.3?arch=source

Affected ranges

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

Affected versions

3.*
3.3.8-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27820.json"

Debian:14 / ruby3.3

Package

Name
ruby3.3
Purl
pkg:deb/debian/ruby3.3?arch=source

Affected ranges

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

Affected versions

3.*
3.3.8-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27820.json"