libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset
Published Oct 20, 2026 · Updated Nov 3, 2026
Original summary
Normalized public record · Updated Nov 3, 2026
libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- GitHub advisory ↗
- Source repository ↗
- Source repository ↗
- Source repository ↗
- VulnCheck Advisory: libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset ↗
Record history
Published Oct 20, 2026 · Last refreshed Nov 3, 2026