High 7.5Published Sep 14, 2025

CVE-2025-59375libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.

Updated under an hour ago (Oct 27, 2026, 3:30 PM ET)

Does this affect you?

It affects libexpat project libexpat and 19 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for libexpat project libexpat

Exploited in the last 30 days

libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:T/RC:C
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

libexpat project libexpat libexpat_project:libexpat (from the name)	before 2.7.2	CNA record
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name)	before V3.3	CISA ADP
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name)	before V3.3	CISA ADP
Siemens SCALANCE XCH328 siemens:scalance_xch328 (from the name)	before V3.3	CISA ADP
Siemens SCALANCE XCM324 siemens:scalance_xcm324 (from the name)	before V3.3	CISA ADP
Siemens SCALANCE XCM328 siemens:scalance_xcm328 (from the name)	before V3.3	CISA ADP
Siemens SCALANCE XCM332 siemens:scalance_xcm332 (from the name)	before V3.3	CISA ADP
Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) siemens:scalance_xrh334_24_v_dc_8xfo_cc (from the name)	before V3.3	CISA ADP
Siemens SCALANCE XRM334 (230 V AC, 12xFO) siemens:scalance_xrm334_230_v_ac_12xfo (from the name)	before V3.3	CISA ADP
Siemens SCALANCE XRM334 (230 V AC, 8xFO) siemens:scalance_xrm334_230_v_ac_8xfo (from the name)	before V3.3	CISA ADP
1–10 of 21

References

References

https://github.com/libexpat/libexpat/issues/1018	exploit, issue-tracking
https://github.com/libexpat/libexpat/pull/1034	issue-tracking
https://github.com/libexpat/libexpat/blob/676a4c531ec768732fac215da9730b5f50fbd2bf/expat/Changes#L45-L74	product
https://issues.oss-fuzz.com/issues/439133977	exploit, issue-tracking
https://github.com/libexpat/libexpat/blob/R_2_7_2/expat/Changes	product
http://www.openwall.com/lists/oss-security/2025/09/16/2
http://www.openwall.com/lists/oss-security/2026/05/01/5
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://cert-portal.siemens.com/productcert/html/ssa-089022.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.