CVE-2016-3630

The binary delta decoder in Mercurial before 3.7.3 allows remote attackers to execute arbitrary code via a (1) clone, (2) push, or (3) pull command, related to (a) a list sizing rounding error and (b) short records.

Published: 2016-04-13 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-3630 is rated High Risk (66.6/100): CVSS High severity, with high exploitation likelihood (EPSS 4.83%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-3630

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 5.19% 4.83% -0.36%
2 2025-07-25 5.13% 5.19% +0.07%
3 2025-05-27 — 5.13% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-3630

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2016-3630

GitHub Security Advisory for CVE-2016-3630

GHSA-9vjf-jjcq-3gh7 · Severity: high · Ecosystem: pip — Mercurial arbitrary code execution vulnerability

OS Trackers for CVE-2016-3630

vendor priority summary link
debian not yet assigned CVE-2016-3630 not yet assigned priority: Debian including 1 source packages (mercurial), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-3630
gentoo normal CVE-2016-3630: 1 GLSA(s) (201612-19), 1 atom(s) (dev-vcs/mercurial); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-3630
redhat high — https://access.redhat.com/security/cve/CVE-2016-3630
suse medium CVE-2016-3630 severity moderate: SUSE including 14 source package names (mercurial, mercurial-2.3.2-0.11.1, …), 30 product×package rows across 28 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (28 product lines)): Fixed 16, Known Not Affected 14. https://www.suse.com/security/cve/CVE-2016-3630/
ubuntu medium CVE-2016-3630 medium priority: Ubuntu including 1 source packages (mercurial), 10 status rows across 10 suites (artful, bionic, cosmic, precise, trusty, upstream, wily, xenial, yakkety, zesty): not-affected 6, ignored 2, released 2. https://ubuntu.com/security/CVE-2016-3630

Affected software / configurations for CVE-2016-3630

Vendor Product Version Raw CPE
fedoraproject fedora 22 cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
fedoraproject fedora 23 cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
opensuse leap 42.1 cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
mercurial mercurial <= 3.7.2 cpe:2.3:a:mercurial:mercurial:*:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
suse linux_enterprise_debuginfo 11 cpe:2.3:a:suse:linux_enterprise_debuginfo:11:sp4:*:*:*:*:*:*
opensuse opensuse 13.2 cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
suse linux_enterprise_software_development_kit 11 cpe:2.3:o:suse:linux_enterprise_software_development_kit:11:sp4:*:*:*:*:*:*
suse linux_enterprise_software_development_kit 12 cpe:2.3:o:suse:linux_enterprise_software_development_kit:12:*:*:*:*:*:*:*
suse linux_enterprise_software_development_kit 12 cpe:2.3:o:suse:linux_enterprise_software_development_kit:12:sp1:*:*:*:*:*:*

References for CVE-2016-3630

URL Tags
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181505.html Mailing List Vendor Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181542.html Mailing List Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00016.html Mailing List Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00017.html Mailing List Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00018.html Mailing List Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00043.html Mailing List Vendor Advisory
http://www.debian.org/security/2016/dsa-3542 Third Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html Third Party Advisory
https://security.gentoo.org/glsa/201612-19 Third Party Advisory
https://selenic.com/repo/hg-stable/rev/b6ed2505d6cf Third Party Advisory
https://selenic.com/repo/hg-stable/rev/b9714d958e89 Third Party Advisory
https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_3.7.3_.282016-3-29.29 Vendor Advisory
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