CVE-2024-45490

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2024-08-30. NVD baseline CVSS 7.5; sources differ by 2.3.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
74.5%
KEV
Not listed

Published

August 30, 2024

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Jul 14, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

CVE-2024-45490 · Issue #887 · libexpat/libexpat · GitHub

https://github.com/libexpat/libexpat/issues/887
github_pr

[CVE-2024-45490] lib: Reject negative len for `XML_ParseBuffer` (fixes #887)

Fix merged in libexpat/libexpat PR #890 on 2024-09-03 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/890

Vendor Advisories for CVE-2024-45490(8)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibexpat1-dev (2.1.0-7ubuntu0.16.04.5+esm9) @ xenial2026-05-21ubuntu
ubuntulibxmltok1-dev (1.2-3ubuntu0.16.04.1~esm4) @ xenial2026-05-21ubuntu
ubuntulibexpat1-dev (2.4.7-1ubuntu0.4) @ jammy2026-05-21ubuntu
ubuntulibxmltok1t64 (1.2-4.1ubuntu2.24.0.4.1+esm1) @ noble2026-05-21ubuntu
redhatexpat2025-04-02redhat
redhatservice-interconnect/skupper-site-controller-rhel9:1.5.5-42024-12-16redhat
redhatservice-interconnect/skupper-site-controller-rhel9:1.4.7-32024-11-21redhat
redhatrhcos-417.94.202411070820-02024-11-19redhat
redhatrhcos-416.94.202410020522-02024-10-09redhat
redhatservice-interconnect/skupper-site-controller-rhel9:1.4.7-22024-09-26redhat
redhatexpat-0:2.2.5-15.el8_102024-09-24redhat
redhatexpat-0:2.5.0-2.el9_4.12024-09-18redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(5)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 13× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 114 total refreshes for this CVE.

  1. 2026-07-19 14:30 UTCEPSS rescore
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  12. 2026-07-14 12:40 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
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  74. 2026-05-21 23:38 UTCEG score recompute
  75. 2026-05-21 23:38 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2024-45490?
CVE-2024-45490 is a critical vulnerability published on August 30, 2024. An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.
When was CVE-2024-45490 disclosed?
CVE-2024-45490 was first published in the National Vulnerability Database on August 30, 2024, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-45490 actively exploited?
CVE-2024-45490 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 74.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-45490?
CVE-2024-45490 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2024-45490?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-45490, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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