Is CVE-2026-24515 in the CISA KEV catalog?

No. CVE-2026-24515 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-24515?

CVE-2026-24515 has a CVSS v3 base score of 2.9 (LOW).

What is the EPSS score for CVE-2026-24515?

CVE-2026-24515 has an EPSS score of 0.17% (7th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-24515?

Upgrade expat on debian unstable to 2.7.3-2 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2026-24515

LOW

2.9

CVSS v3

NVD

Description

In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

expatDebian

Fixed in:2.7.3-2CVE-2026-24515

expatUbuntu

Fixed in:2.1.0-4ubuntu1.4+esm11USN-8022-1

Fixed in:2.1.0-7ubuntu0.16.04.5+esm11USN-8022-1

Fixed in:2.2.5-3ubuntu0.9+esm3USN-8022-1

Fixed in:2.2.9-1ubuntu0.8+esm1USN-8022-1

Fixed in:2.4.7-1ubuntu0.7USN-8022-1

Fixed in:2.6.1-2ubuntu0.4USN-8022-2

Fixed in:2.7.1-2ubuntu0.2USN-8022-1

lib64expat1Ubuntu

Fixed in:2.1.0-4ubuntu1.4+esm11USN-8022-1

Fixed in:2.1.0-7ubuntu0.16.04.5+esm11USN-8022-1

libexpat1Ubuntu

Fixed in:2.1.0-4ubuntu1.4+esm11USN-8022-1

Fixed in:2.1.0-7ubuntu0.16.04.5+esm11USN-8022-1

Fixed in:2.2.5-3ubuntu0.9+esm3USN-8022-1

Fixed in:2.2.9-1ubuntu0.8+esm1USN-8022-1

Fixed in:2.4.7-1ubuntu0.7USN-8022-1

Fixed in:2.6.1-2ubuntu0.4USN-8022-2

Fixed in:2.7.1-2ubuntu0.2USN-8022-1

libxmltokUbuntu

Fixed in:1.2-3ubuntu0.16.04.1~esm5USN-8023-1

Fixed in:1.2-4ubuntu0.18.04.1~esm6USN-8023-1

Fixed in:1.2-4ubuntu0.20.04.1~esm6USN-8023-1

Fixed in:1.2-4ubuntu0.22.04.1~esm6USN-8023-1

Fixed in:1.2-4.1ubuntu2.24.0.4.1+esm4USN-8023-1

libxmltok1Ubuntu

Fixed in:1.2-3ubuntu0.16.04.1~esm5USN-8023-1

Fixed in:1.2-4ubuntu0.18.04.1~esm6USN-8023-1

Fixed in:1.2-4ubuntu0.20.04.1~esm6USN-8023-1

Fixed in:1.2-4ubuntu0.22.04.1~esm6USN-8023-1

libxmltok1t64Ubuntu

Fixed in:1.2-4.1ubuntu2.24.0.4.1+esm4USN-8023-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.17%probability of exploitation in 30 days

7thpercentile

Low risk: more likely to be exploited than 7% of all known CVEs.

References

Issue Tracking1

github.com

Other references1

cert-portal.siemens.com

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-02.