CVE-2019-13050: Interaction between the sks-keyserver code through 1.2.0 of the SKS keyserver network, and GnuPG through 2.2.1

This week

HIGH 7.5REMOTEUPGRADEUPGRADEMITIGATE

CVE-2019-13050 is a high-severity flaw (CVSS 7.5) affecting gnupg, sks keyserver, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Interaction between the sks-keyserver code through 1.2.0 of the SKS keyserver network, and GnuPG through 2.2.16, makes it risky to have a GnuPG keyserver configuration line referring to a host on the SKS keyserver network. Retrieving data from this network may cause a persistent denial of service, because of a Certificate Spamming Attack.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-295
Published	2019-06-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: f5 · fedoraproject · gnupg · opensuse · sks keyserver project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-06-29 17:15 UTCPublished CVE record published
2026-06-17 02:15 UTCUpdated Record last modified

gnupg gnupg UPGRADE

Affected: <= 2.2.16

Fixed in: newer than 2.2.16

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy gnupg || rpm -q gnupg || gnupg --version

2. UPGRADE to newer than 2.2.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gnupg

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gnupg

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

sks keyserver project sks keyserver UPGRADE

Affected: <= 1.2.0

Fixed in: newer than 1.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sks-keyserver || rpm -q sks-keyserver || sks-keyserver --version

2. UPGRADE to newer than 1.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sks-keyserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sks-keyserver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fedoraproject fedora MITIGATE

Affected: 29 · 30

Fixed in: no fixed release known

Safe to downgrade to: a release before 29

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

opensuse leap MITIGATE

Affected: 15.0 · 15.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

f5 traffix signaling delivery controller UPGRADE

Affected: >= 5.0.0 and <= 5.1.0

Fixed in: newer than 5.1.0

Safe to downgrade to: a release before 5.0.0

1. Check installed version

apt-cache policy traffix-signaling-delivery-controller || rpm -q traffix-signaling-delivery-controller || traffix-signaling-delivery-controller --version

2. UPGRADE to newer than 5.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade traffix-signaling-delivery-controller

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade traffix-signaling-delivery-controller

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)

apt-cache madison traffix-signaling-delivery-controller sudo apt install traffix-signaling-delivery-controller=<VERSION_BEFORE_5.0.0> sudo apt-mark hold traffix-signaling-delivery-controller

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list traffix-signaling-delivery-controller sudo dnf downgrade traffix-signaling-delivery-controller-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add traffix-signaling-delivery-controller

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-13050?

gnupg: upgrade to newer than 2.2.16; sks keyserver: upgrade to newer than 1.2.0; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-13050 being exploited?

CVE-2019-13050 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-13050 affect?

CVE-2019-13050 affects gnupg, sks keyserver, fedora. Severity is high (CVSS 7.5). Interaction between the sks-keyserver code through 1.2.0 of the SKS keyserver network, and GnuPG through 2.2.16, makes it risky to have a GnuPG keyserver configuration line referring to a host on the SKS keyserver network. Retrieving data f

How urgent is CVE-2019-13050?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

F5 BIG-IP vulnerabilities · GnuPG vulnerabilities

Related CVEs

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CVE-2025-68972 MEDIUM 5.9 UPGRADE In GnuPG through 2.4.8, if a signed message has \f at the end of a plaintext line, an adversary can construct
CVE-2026-24882 HIGH 8.4 UPGRADE UPGRADE In GnuPG before 2.5.17, a stack-based buffer overflow exists in tpm2daemon during handling of the PKDECRYPT co
CVE-2026-24881 HIGH 8.1 UPGRADE UPGRADE In GnuPG before 2.5.17, a crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped session key
CVE-2026-24883 LOW 3.7 UPGRADE UPGRADE In GnuPG before 2.5.17, a long signature packet length causes parse_signature to return success with sig->data

References

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