Uncontrolled recursion in rust-yaml

published 2018-09-17 8 y ago modified 2026-06-17 4 mo ago also GHSA-hv87-47h9-jcvq , RUSTSEC-2018-0006 , EUVD-2021-1760

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.4%; EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits: 0; none known

An issue was discovered in the yaml-rust crate before 0.4.1 for Rust. There is uncontrolled recursion during deserialization.

Patch / fix

fixed in 2 links 3

crates.io yaml-rust 0.4.1
yaml-rust_project yaml-rust 0.4.1

github.com/chyh1990/yaml-rust@d61b49c commit
github.com/chyh1990/yaml-rust#109 pull request
rustsec.org/advisories/RUSTSEC-2018-0006.html advisory

Exploit prediction

1.41% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P
OSV	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
crates.io	yaml-rust	<0.4.1 >=0.0.0-0, <0.4.1	0.4.1

Classification

Weakness

CWE-674 Uncontrolled Recursion

References

rustsec.org /advisories/RUSTSEC-2018-0006.html
web, patch, third-party-advisory, advisory
github.com /chyh1990/yaml-rust/pull/109
web
github.com /chyh1990/yaml-rust/commit/d61b49cb90391fc4f7f72a1abe597476c8651a07
web
nvd.nist.gov /vuln/detail/CVE-2018-20993
advisory
github.com /chyh1990/yaml-rust
package
crates.io /crates/yaml-rust
package

Sources

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.

Summary