PT-2025-39507 · Crates.Io · Serde Yaml

Published 2025-09-15 · Updated 2025-09-15

OSV

CVSS v4.0

6.9

Medium

Base vector

AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Using serde yml::ser::Serializer.emitter can cause a segmentation fault, which is unsound.

The GitHub project for serde yml was archived after unsoundness issues were raised.

If you rely on this crate, it is highly recommended switching to a maintained alternative.

Recommended alternatives

• [serde norway](https://crates.io/crates/serde norway) - Maintained fork of serde yaml, using unsafe-libyaml-norway
• [serde yaml ng](https://crates.io/crates/serde yaml ng) - Maintained fork of serde yaml, using unmaintained unsafe-libyaml

Incomplete pure Rust alternatives

These implementation do not rely on C libyaml.

• [serde yaml2](https://crates.io/crates/serde yaml2)
• yaml-peg

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

GHSA-HHW4-XG65-FP2X

Affected Products

Serde Yaml

References · 4

• https://osv.dev/vulnerability/GHSA-hhw4-xg65-fp2x · Vendor Advisory
• https://github.com/rustsec/advisory-db/issues/2395 · Note
• https://github.com/sebastienrousseau/serde_yml · Note
• https://rustsec.org/advisories/RUSTSEC-2025-0068.html · Note