CVE-2014-9087: Integer underflow in the ksba_oid_to_str function in Libksba before 1.3.2, as used in GnuPG, allows remote att

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HIGH 7.5WATCHLISTMITIGATEMITIGATEUPGRADE

CVE-2014-9087 is a high-severity flaw (CVSS 7.5) affecting mageia, debian linux, libksba. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer underflow in the ksba_oid_to_str function in Libksba before 1.3.2, as used in GnuPG, allows remote attackers to cause a denial of service (crash) via a crafted OID in a (1) S/MIME message or (2) ECC based OpenPGP data, which triggers a buffer overflow.

Why this priority

High severity
EPSS top 7%: very likely to be exploited
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	5.7% (top 7%)
CISA exploited list	No
Weakness	CWE-191
Published	2014-12-01
Last modified	2026-06-17

Publisher (CNA): Debian GNU/Linux · Vendor: canonical · debian · gnupg · mageia

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

Am I affected?

Timeline

2014-12-01 15:59 UTCPublished CVE record published
2026-06-17 00:17 UTCUpdated Record last modified

mageia mageia MITIGATE

Affected: 3.0 · 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

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.

debian debian linux MITIGATE

Affected: 7.0 · 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

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.

gnupg libksba UPGRADE

Affected: < 1.3.2

Fixed in: 1.3.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.3.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libksba

Note

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

canonical ubuntu linux MITIGATE

Affected: 12.04 · 14.04 · 14.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.04

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.

gnupg gnupg DOWNGRADE

Affected: 2.1.0 · 2.1.0 beta1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1.0 (Debian / Ubuntu)

apt-cache madison gnupg sudo apt install gnupg=<VERSION_BEFORE_2.1.0> sudo apt-mark hold gnupg

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gnupg sudo dnf downgrade gnupg-<VERSION_BEFORE_2.1.0> sudo dnf versionlock add gnupg

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-2014-9087?

mageia: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation; libksba: upgrade to 1.3.2. Exact commands for each OS are on this page.

Is CVE-2014-9087 being exploited?

CVE-2014-9087 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-2014-9087 affect?

CVE-2014-9087 affects mageia, debian linux, libksba. Severity is high (CVSS 7.5). Integer underflow in the ksba_oid_to_str function in Libksba before 1.3.2, as used in GnuPG, allows remote attackers to cause a denial of service (crash) via a crafted OID in a (1) S/MIME message or (2) ECC based OpenPGP data, which trigger

How urgent is CVE-2014-9087?

Priority 54/100. High severity; EPSS top 7%: very likely to be exploited; On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities · GnuPG vulnerabilities

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References

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