Improper certificate validation in mercurial
Priority LOW 28CWE-295Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-295.
Summary
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.
Why it matters now
EPSS 0.00821 57th percentileScored 2026-11-07
Fix Partial mercurial (PyPI): 1.6.4Red Hat: 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mercurial | mercurial | 1.6.4 | — | No fix listed | CNA |
| — | mercurial (PyPI) | before 1.6.4 | 1.6.4 | Patch available | GHSA-7gf7-7wx4-mxmw |
- mercurial VendorMercurial Affected 1.6.4 Fixed in — No fix listed CNA
- mercurial (PyPI) Vendor— Affected before 1.6.4 Fixed in 1.6.4 Patch available GHSA-7gf7-7wx4-mxmw
Remediation
- Fix · GHSA-7gf7-7wx4-mxmw mercurial (PyPI) Fixed in 1.6.4 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2010-4237
- 2026-10-03 Alias added: GHSA-7gf7-7wx4-mxmw
References
Advisory 5
More Mercurial vulnerabilities
- TI-2014-07619 Git before 1.8.5.6, 1.9.x before 1.9.5, 2.0.x before 2.0.5, 2.1.x before 2.1.4, and 2.2.x… CVSS 3.1CRITICAL 9.8
- TI-2017-06870 In Mercurial before 4.1.3, "hg serve --stdio" allows remote authenticated users to launch… CVSS 3.1HIGH 8.8
- TI-2017-14453 Mercurial prior to 4.3 did not adequately sanitize hostnames passed to ssh, leading to possible shell-injection attacks. CVSS 3.0CRITICAL 9.8
- TI-2017-12752 In Mercurial before 4.4.1, it is possible that a specially malformed repository can cause… CVSS 3.0CRITICAL 9.8
- TI-2018-09592 mpatch.c in Mercurial before 4.6.1 mishandles integer addition and subtraction, aka OVE-20180430-0002. CVSS 3.0CRITICAL 9.8
- TI-2016-03079 The binary delta decoder in Mercurial before 3.7.3 allows remote attackers to execute… CVSS 3.1HIGH 8.8
Sources
- CVE-2010-4237 · CVE Program
- CVE-2010-4237 · NVD
- FIRST EPSS
- GHSA-7gf7-7wx4-mxmw · GitHub Advisory Database · CC BY 4.0
- CVE-2010-4237 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences