High
libexpat through 2.9.0 Denial of Service via Billion Laughs Detection Delay
libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.
Announced Group revision 1
Original source ↗CVE-2026-115506
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: cve:CVE-2026-115506
libexpat
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- 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.
[
{
"repo": "https://github.com/libexpat/libexpat",
"vendor": "libexpat",
"product": "libexpat",
"versions": [
{
"status": "affected",
"version": "0",
"versionType": "semver",
"lessThanOrEqual": "2.9.0"
}
],
"packageURL": "pkg:github/libexpat/libexpat",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-115506
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #53241 · Revision 1
- Added to Heist Feed
- Publisher date