01 Record

CVE-2024-28757

libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).

HighPUBLISHEDCNA: mitre

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

View raw JSON

02 Description

libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

2.00% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 80.6% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-15.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-03-10 00:00Z2 YR AGO

Last updated

2026-10-15 00:40Z14 DAYS AGO

Reserved

2024-03-10

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-776Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')Base

Data version

5.2

Document digest

0c33a84361c36cd3fcc2e1e335bc394e4aa0e6dad34bf3634adac38a4b733734

05 Affected products

VendorProductVersionsPlatforms

fedoraprojectfedoraNot specified—

libexpat_projectlibexpatNot specified—

netappactive_iq_unified_managerNot specified—

netapph300sNot specified—

netapph300s_firmwareNot specified—

netapph410cNot specified—

netapph410c_firmwareNot specified—

netapph410sNot specified—

netapph410s_firmwareNot specified—

netapph500sNot specified—

netapph500s_firmwareNot specified—

netapph610cNot specified—

netapph610c_firmwareNot specified—

netapph610sNot specified—

netapph610s_firmwareNot specified—

netapph700sNot specified—

netapph700s_firmwareNot specified—

netapponcommand_workflow_automationNot specified—

netappontapNot specified—

netappontap_toolsNot specified—

netappwindows_host_utilitiesNot specified—

redhatenterprise_linuxNot specified—

redhatopenshiftNot specified—

redhatrhel_eusNot specified—

06 References

github.comhttps://github.com/libexpat/libexpat/pull/842
github.comhttps://github.com/libexpat/libexpat/issues/839
lists.fedoraproject.orgFEDORA-2024-4e6e660faehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/vendor-advisory
lists.fedoraproject.orgFEDORA-2024-40b98c9cedhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/vendor-advisory
security.netapp.comhttps://security.netapp.com/advisory/ntap-20240322-0001/
lists.fedoraproject.orgFEDORA-2024-afb73e6f62https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/vendor-advisory
www.openwall.com[oss-security] 20240315 Expat 2.6.2 released, includes security fixeshttp://www.openwall.com/lists/oss-security/2024/03/15/1mailing-list
lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/
lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/
lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-784301.html

07 Fixed in

AlmaLinux 8

expat
Fixed in 2.5.0-1.el8_10
expat-devel
Fixed in 2.5.0-1.el8_10

AlmaLinux 9

expat
Fixed in 2.5.0-1.el9_3.1
expat-devel
Fixed in 2.5.0-1.el9_3.1

CloudLinux 8

expat
Fixed in 2.5.0-1.el8_10
expat-devel
Fixed in 2.5.0-1.el8_10

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

CloudLinux 9

expat
Fixed in 2.5.0-1.el9_3.1
expat-devel
Fixed in 2.5.0-1.el9_3.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Debian 12

expat
Fixed in 2.5.0-1+deb12u4
libxmltok
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

expat
Fixed in 2.6.1-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

expat
Fixed in 2.6.1-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.