DEBIAN-CVE-2026-88359
libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When processing a specially crafted YAML document containing a very large literal or folded block scalar, the function repeatedly grows an internal buffer using alloca() inside a loop. The allocated stack memory is not released until the function returns, causing cumulative stack growth that can exceed the process stack limit and result in SIGSEGV and denial of service.
DEBIAN-CVE-2026-88359
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-88359
libfyaml
Source reference: /affected/0/package/name
- Affected versions
- 0.7.12-2
Source reference:
/affected/0/versions0.8-1Source reference:
/affected/0/versions0.9-1Source reference:
/affected/0/versions0.9-2Source reference:
/affected/0/versions0.9.2-1Source reference:
/affected/0/versions0.9.3-1Source reference:
/affected/0/versions0.9.4-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libfyaml
Source reference: /affected/1/package/name
- Affected versions
- 0.8-1
Source reference:
/affected/1/versions0.9-1Source reference:
/affected/1/versions0.9-2Source reference:
/affected/1/versions0.9.2-1Source reference:
/affected/1/versions0.9.3-1Source reference:
/affected/1/versions0.9.4-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libfyaml
Source reference: /affected/2/package/name
- Affected versions
- 0.8-1
Source reference:
/affected/2/versions0.9-1Source reference:
/affected/2/versions0.9-2Source reference:
/affected/2/versions0.9.2-1Source reference:
/affected/2/versions0.9.3-1Source reference:
/affected/2/versions0.9.4-1Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libfyaml",
"purl": "pkg:deb/debian/libfyaml?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.7.12-2",
"0.8-1",
"0.9-1",
"0.9-2",
"0.9.2-1",
"0.9.3-1",
"0.9.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88359.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libfyaml",
"purl": "pkg:deb/debian/libfyaml?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.8-1",
"0.9-1",
"0.9-2",
"0.9.2-1",
"0.9.3-1",
"0.9.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88359.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libfyaml",
"purl": "pkg:deb/debian/libfyaml?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.8-1",
"0.9-1",
"0.9-2",
"0.9.2-1",
"0.9.3-1",
"0.9.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88359.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #18763 · Revision 1
- Added to Heist Feed
- Publisher date