CVE-2023-47163

Remarshal expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack

7.5 HighFix available

Remarshal prior to v0.17.1 expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack. Processing untrusted YAML files may cause a denial-of-service (DoS) condition.

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: None
Integrity: None
Availability: High

Exploit likelihood

0.96%Up 0.9 points since Nov 13, 2023

What each source reports

NVD Score used 7.5

Remarshal prior to v0.17.1 expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack. Processing untrusted YAML files may cause a denial-of-service (DoS) condition.

Record: CVE-2023-47163
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-674
Updated: 2026-11-02

CVE List No score

Remarshal prior to v0.17.1 expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack. Processing untrusted YAML files may cause a denial-of-service (DoS) condition.

Record: CVE-2023-47163
Updated: 2026-11-02

EUVDEUVD-2023-0225 0.0

Remarshal prior to v0.17.1 expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack. Processing untrusted YAML files may cause a denial-of-service (DoS) condition.

Record: EUVD-2023-0225
CVSS: 0.0 NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-gw7g-qr8w-3448 8.7

Remarshal expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack

Remarshal prior to v0.17.1 expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack. Processing untrusted YAML files may cause a denial-of-service (DoS) condition.

Record: GHSA-gw7g-qr8w-3448
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400, CWE-674
Updated: 2026-11-02

OSVGHSA-gw7g-qr8w-3448 8.7

Remarshal expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack

Remarshal prior to v0.17.1 expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack. Processing untrusted YAML files may cause a denial-of-service (DoS) condition.

Record: GHSA-gw7g-qr8w-3448
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400, CWE-674
Updated: 2026-11-02

OSVPYSEC-2023-236 7.5

Remarshal prior to v0.17.1 expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack. Processing untrusted YAML files may cause a denial-of-service (DoS) condition.

Record: PYSEC-2023-236
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSV No score

Remarshal prior to v0.17.1 expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack. Processing untrusted YAML files may cause a denial-of-service (DoS) condition.

Record: CVE-2023-47163
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`remarshal` PyPI	before 0.17.1	0.17.1
`remarshal` PyPI	before 0.17.1, plus listed versions 0.10.00.11.00.11.10.11.20.12.0 Show 10 moreShow less 0.14.00.15.00.15.10.16.00.16.10.17.00.8.00.9.00.9.10.9.2	0.17.1
`remarshal` PyPI	before 0.17.1, plus listed versions 0.10.00.11.00.11.10.11.20.12.0 Show 33 moreShow less 0.14.00.15.00.15.10.16.00.16.10.17.00.8.00.9.00.9.10.9.2v0.17.0v0.16.1v0.16.0v0.15.1v0.15.0v0.14.0v0.13.0v0.12.0v0.11.2v0.11.1v0.11.0v0.10.0v0.9.2v0.9.1v0.9.0v0.8.0v0.7.0v0.6.0v0.5.1v0.5.0v0.4.0v0.3.0v0.2.1	0.17.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-47163 is a high vulnerability (CVSS 7.5) in Remarshal-project Remarshal, published November 13, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.96%, the 61st percentile. Fixed in remarshal 0.17.1.

Attack profile

How easy it is to exploit

What an attacker can affect

Exploit likelihood

What each source reports

Affected products

Affected packages

History

In short

References