CVE-2019-9155: A cryptographic issue in OpenPGP.js <=4.2.0 allows an attacker who is able provide forged messages and gain fe

Q: How do I fix CVE-2019-9155?

openpgpjs: upgrade to newer than 4.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2019-9155 being exploited?

CVE-2019-9155 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-9155 affect?

CVE-2019-9155 affects openpgpjs. Severity is medium (CVSS 5.9). A cryptographic issue in OpenPGP.js <=4.2.0 allows an attacker who is able provide forged messages and gain feedback about whether decryption of these messages succeeded to conduct an invalid curve attack in order to gain the victim's ECDH

Q: How urgent is CVE-2019-9155?

Priority 50/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.9REMOTEUPGRADE

CVE-2019-9155 is a medium-severity flaw (CVSS 5.9) affecting openpgpjs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cryptographic issue in OpenPGP.js <=4.2.0 allows an attacker who is able provide forged messages and gain feedback about whether decryption of these messages succeeded to conduct an invalid curve attack in order to gain the victim's ECDH private key.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-327
Published	2019-08-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openpgpjs

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

Am I affected?

Timeline

2019-08-22 16:15 UTCPublished CVE record published
2026-06-17 02:43 UTCUpdated Record last modified

openpgpjs openpgpjs UPGRADE

Affected: <= 4.2.0

Fixed in: newer than 4.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.2.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openpgpjs

Note

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

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-2019-9155?

openpgpjs: upgrade to newer than 4.2.0. Exact commands for each OS are on this page.

Is CVE-2019-9155 being exploited?

CVE-2019-9155 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-2019-9155 affect?

CVE-2019-9155 affects openpgpjs. Severity is medium (CVSS 5.9). A cryptographic issue in OpenPGP.js <=4.2.0 allows an attacker who is able provide forged messages and gain feedback about whether decryption of these messages succeeded to conduct an invalid curve attack in order to gain the victim's ECDH

How urgent is CVE-2019-9155?

Priority 50/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-9154 HIGH 7.5 UPGRADE Improper Verification of a Cryptographic Signature in OpenPGP.js <=4.1.2 allows an attacker to pass off unsign
CVE-2019-9153 HIGH 7.5 UPGRADE Improper Verification of a Cryptographic Signature in OpenPGP.js <=4.1.2 allows an attacker to forge signed me
CVE-2015-8013 HIGH 7.5 UPGRADE s2k.js in OpenPGP.js will decrypt arbitrary messages regardless of passphrase for crafted PGP keys which allow

References

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