CVE-2024-28757

CVE-2024-28757 is a high-severity vulnerability in Libexpat Project Libexpat with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-776.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• EPSS exploit prediction: 2% (78th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2024-25843
• Weakness: CWE-776
• Affected product: Libexpat Project Libexpat
• Published: 2024-03-10
• Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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).

How severe is CVE-2024-28757?

CVE-2024-28757 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-28757 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-28757?

CVE-2024-28757 primarily affects Libexpat Project Libexpat. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-28757?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-28757 have an EU (EUVD) identifier?

Yes. CVE-2024-28757 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-25843.

When was CVE-2024-28757 published?

CVE-2024-28757 was published on 2024-03-10 and last updated on 2026-06-17.

References

• http://www.openwall.com/lists/oss-security/2024/03/15/1
• https://github.com/libexpat/libexpat/issues/839
• https://github.com/libexpat/libexpat/pull/842
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/
• https://security.netapp.com/advisory/ntap-20240322-0001/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/

Affected products (16)

• cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
• cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:ontap:9:*:*:*:*:*:*:*
• cpe:2.3:a:netapp:ontap_tools:10:*:*:*:*:vmware_vsphere:*:*
• cpe:2.3:a:netapp:windows_host_utilities:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h610c_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:netapp:h610s_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Libexpat Project Libexpat

• CVE-2024-45492 — Critical (CVSS 9.8): An issue was discovered in libexpat before 2.6.3. nextScaffoldPart in xmlparse.c can have an integer overflow for…
• CVE-2024-45491 — Critical (CVSS 9.8): An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts…
• CVE-2022-25315 — Critical (CVSS 9.8): In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.
• CVE-2022-25236 — Critical (CVSS 9.8): xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into…
• CVE-2022-25235 — Critical (CVSS 9.8): xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a…
• CVE-2022-23852 — Critical (CVSS 9.8): Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero…

All CVEs affecting Libexpat Project Libexpat →

Other CWE-776 vulnerabilities

• CVE-2019-19144 — Critical (CVSS 9.8): XML External Entity Injection vulnerability in Quantum DXi6702 2.3.0.3 (11449-53631 Build304) devices via…
• CVE-2022-23640 — Critical (CVSS 9.8): Excel-Streaming-Reader is an easy-to-use implementation of a streaming Excel reader using Apache POI. Prior to…
• CVE-2014-2228 — Critical (CVSS 9.8): The XStream extension in HP Fortify SCA before 2.2 RC3 allows remote attackers to execute arbitrary code via unsafe…
• CVE-2013-4335 — Critical (CVSS 9.8): opOpenSocialPlugin 0.8.2.1, > 0.9.9.2, 0.9.13, 1.2.6: Multiple XML External Entity Injection Vulnerabilities
• CVE-2021-23926 — Critical (CVSS 9.1): The XML parsers used by XMLBeans up to version 2.6.0 did not set the properties needed to protect the user from…
• CVE-2020-24590 — Critical (CVSS 9.1): The Management Console in WSO2 API Manager through 3.1.0 and API Microgateway 2.2.0 allows XML Entity Expansion attacks.

Browse all CWE-776 vulnerabilities →