CVE-2010-4237

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-10-29 · updated 2026-06-16
Weakness: CWE-295

Description

Mercurial before 1.6.4 fails to verify the Common Name field of SSL certificates which allows remote attackers who acquire a certificate signed by a Certificate Authority to perform a man-in-the-middle attack.

Affected products

mercurial: before 1.6.4 — fixed in 1.6.4

How to fix

Upgrade to a fixed version: mercurial 1.6.4. Check the vendor advisory for mitigations.

References

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=598841
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-4237
https://bz.mercurial-scm.org/show_bug.cgi?id=2407
https://security-tracker.debian.org/tracker/CVE-2010-4237
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=598841
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-4237
https://bz.mercurial-scm.org/show_bug.cgi?id=2407
https://security-tracker.debian.org/tracker/CVE-2010-4237

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