CVE-2023-47163 json
Remarshal expands YAML alias nodes unlimitedly, hence Remarshal is vulnerable to Billion Laughs Attack
published 2023-11-13 2 y ago modified 2026-06-17 4 mo ago also GHSA-gw7g-qr8w-3448 , PYSEC-2023-236 , EUVD-2023-0225
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi remarshal 0.17.1
- remarshal_project remarshal 0.17.1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 22 mo ago
Exploit prediction
0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | remarshal | <0.17.1 |
0.17.1 |
Affected products
- Remarshal-project Remarshal
Classification
References
-
github.com
/remarshal-project/remarshal/commit/fd6ac799a02f533c3fc243b49cdd6d21aa7ee494
web, patch
-
github.com
/remarshal-project/remarshal/releases/tag/v0.17.1
web, release-notes
-
jvn.jp
/en/jp/JVN86156389/
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2023-47163
advisory
-
github.com
/pypa/advisory-database/tree/main/vulns/remarshal/PYSEC-2023-236.yaml
web
-
github.com
/remarshal-project/remarshal
package
-
jvn.jp
/en/jp/JVN86156389
web
-
github.com
/advisories/GHSA-gw7g-qr8w-3448
advisory
Sources
- CVE List CVE-2023-47163
- GitHub Advisory GHSA-gw7g-qr8w-3448
- NVD CVE-2023-47163
- OSV PYSEC-2023-236
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.