CVE-2018-3739
Denial of Service in https-proxy-agent
https-proxy-agent before 2.1.1 passes auth option to the Buffer constructor without proper sanitization, resulting in DoS and uninitialized memory leak in setups where an attacker could submit typed input to the 'auth' parameter (e.g. JSON).
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
https-proxy-agent before 2.1.1 passes auth option to the Buffer constructor without proper sanitization, resulting in DoS and uninitialized memory leak in setups where an attacker could submit typed input to the 'auth' parameter (e.g. JSON).
- Record
CVE-2018-3739- CVSS 3.0
- 9.1 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - CVSS 2.0
- 6.4 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:P - Weakness
- CWE-400, CWE-125
- Updated
- 2026-11-02
CVE List No score
https-proxy-agent before 2.1.1 passes auth option to the Buffer constructor without proper sanitization, resulting in DoS and uninitialized memory leak in setups where an attacker could submit typed input to the 'auth' parameter (e.g. JSON).
- Record
CVE-2018-3739- Weakness
- CWE-400
- Updated
- 2026-11-02
EUVDEUVD-2018-0249 No score
https-proxy-agent before 2.1.1 passes auth option to the Buffer constructor without proper sanitization, resulting in DoS and uninitialized memory leak in setups where an attacker could submit typed input to the 'auth' parameter (e.g. JSON).
- Record
EUVD-2018-0249- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8g7p-74h8-hg48
Denial of Service in https-proxy-agent
Versions of https-proxy-agent before 2.2.0 are vulnerable to denial of service. This is due to unsanitized options (proxy.auth) being passed to Buffer().
Recommendation
Update to version 2.2.0 or later.
- Record
GHSA-8g7p-74h8-hg48- CVSS 3.0
- 9.1 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- CWE-125, CWE-400
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-pc5p-h8pf-mvwp
Machine-In-The-Middle in https-proxy-agent
Versions of https-proxy-agent prior to 2.2.3 are vulnerable to Machine-In-The-Middle. The package fails to enforce TLS on the socket if the proxy server responds the to the request with a HTTP status different than 200. This allows an attacker with access to the proxy server to intercept unencrypted communications, which may include sensitive information such as credentials.
Recommendation
Upgrade to version 3.0.0 or 2.2.3.
- Record
GHSA-pc5p-h8pf-mvwp- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-300
- Updated
- 2026-11-02
OSV
https-proxy-agent before 2.1.1 passes auth option to the Buffer constructor without proper sanitization, resulting in DoS and uninitialized memory leak in setups where an attacker could submit typed input to the 'auth' parameter (e.g. JSON).
- Record
CVE-2018-3739- CVSS 3.0
- 9.1 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Updated
- 2026-11-02
OSVGHSA-8g7p-74h8-hg48
Denial of Service in https-proxy-agent
Versions of https-proxy-agent before 2.2.0 are vulnerable to denial of service. This is due to unsanitized options (proxy.auth) being passed to Buffer().
Recommendation
Update to version 2.2.0 or later.
- Record
GHSA-8g7p-74h8-hg48- CVSS 3.0
- 9.1 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- CWE-125, CWE-400
- Updated
- 2026-11-02
OSVGHSA-pc5p-h8pf-mvwp
Machine-In-The-Middle in https-proxy-agent
Versions of https-proxy-agent prior to 2.2.3 are vulnerable to Machine-In-The-Middle. The package fails to enforce TLS on the socket if the proxy server responds the to the request with a HTTP status different than 200. This allows an attacker with access to the proxy server to intercept unencrypted communications, which may include sensitive information such as credentials.
Recommendation
Upgrade to version 3.0.0 or 2.2.3.
- Record
GHSA-pc5p-h8pf-mvwp- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-300
- Updated
- 2026-11-02
OSVCLSA-2026-1776904630 No score
TuxCare security update for https-proxy-agent (2 CVEs)
TuxCare rebuilt https-proxy-agent to address 2 CVEs. Fixed in 1.0.0-tuxcare.1.
- Record
CLSA-2026-1776904630- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
https-proxy-agentnpm |
before 2.2.0 | 2.2.0 |
https-proxy-agentnpm |
before 2.2.3 | 2.2.3 |
https-proxy-agentTuxCare:npm |
1.0.0-tuxcare.0 up to 1.0.0-tuxcare.1, plus listed versions 1.0.0 |
1.0.0-tuxcare.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-3739 is a critical vulnerability (CVSS 9.1) in Https-proxy-agent Project Https-proxy-agent, published June 7, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.74%, the 77th percentile. Fixed in https-proxy-agent 2.2.0.
References
hackerone.com/reports/319532
nvd.nist.gov/vuln/detail/CVE-2018-3736
github.com/advisories/GHSA-8g7p-74h8-hg48
npmjs.com/advisories/593