CVE-2018-15586: Enigmail before 2.0.6 is prone to to OpenPGP signatures being spoofed for arbitrary messages using a PGP/INLIN

Q: How do I fix CVE-2018-15586?

enigmail: upgrade to 2.0.6. Exact commands for each OS are on this page.

Q: Is CVE-2018-15586 being exploited?

CVE-2018-15586 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-2018-15586 affect?

CVE-2018-15586 affects enigmail. Severity is medium (CVSS 6.5). Enigmail before 2.0.6 is prone to to OpenPGP signatures being spoofed for arbitrary messages using a PGP/INLINE signature wrapped within a specially crafted multipart HTML email.

Q: How urgent is CVE-2018-15586?

Priority 46/100. Public exploit reference

This month

MEDIUM 6.5UPGRADE

CVE-2018-15586 is a medium-severity flaw (CVSS 6.5) affecting enigmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Enigmail before 2.0.6 is prone to to OpenPGP signatures being spoofed for arbitrary messages using a PGP/INLINE signature wrapped within a specially crafted multipart HTML email.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-347
Published	2019-02-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: enigmail

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

Am I affected?

Timeline

2019-02-11 17:29 UTCPublished CVE record published
2026-06-17 01:42 UTCUpdated Record last modified

enigmail enigmail UPGRADE

Affected: < 2.0.6

Fixed in: 2.0.6

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.0.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade enigmail

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-2018-15586?

enigmail: upgrade to 2.0.6. Exact commands for each OS are on this page.

Is CVE-2018-15586 being exploited?

CVE-2018-15586 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-2018-15586 affect?

CVE-2018-15586 affects enigmail. Severity is medium (CVSS 6.5). Enigmail before 2.0.6 is prone to to OpenPGP signatures being spoofed for arbitrary messages using a PGP/INLINE signature wrapped within a specially crafted multipart HTML email.

How urgent is CVE-2018-15586?

Priority 46/100. Public exploit reference

Related CVEs

CVE-2019-14664 MEDIUM 6.5 UPGRADE MITIGATE In Enigmail below 2.1, an attacker in possession of PGP encrypted emails can wrap them as sub-parts within a c
CVE-2019-12269 HIGH 7.5 UPGRADE Enigmail before 2.0.11 allows PGP signature spoofing: for an inline PGP message, an attacker can cause the pro
CVE-2018-12019 HIGH 7.5 UPGRADE The signature verification routine in Enigmail before 2.0.7 interprets user ids as status/control messages and
CVE-2017-17848 HIGH 7.5 UPGRADE MITIGATE An issue was discovered in Enigmail before 1.9.9
CVE-2017-17847 HIGH 7.5 UPGRADE MITIGATE An issue was discovered in Enigmail before 1.9.9

References

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