CVE-2022-22822

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-02-10. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
—
EPSS
91.1%
KEV
Not listed

Published

January 10, 2022

Last Modified

May 5, 2025

Advisory Details (5)

Auto-updated Jun 6, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

Expat: Multiple Vulnerabilities (GLSA 202209-24) — Gentoo security

https://security.gentoo.org/glsa/202209-24
github_pr

[CVE-2022-22822 to CVE-2022-22827] lib: Prevent more integer overflows

Fix merged in libexpat/libexpat PR #539 on 2022-01-13 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/539
generic

oss-security - Expat 2.4.3 released, includes 8 security fixes

http://www.openwall.com/lists/oss-security/2022/01/17/3
generic

[R1] Nessus Versions 8.15.3 and 10.1.1 Fix Multiple Third-Party Vulnerabilities - Security Advisory | Tenable®

https://www.tenable.com/security/tns-2022-05
generic

[SECURITY] [DSA 5073-1] expat security update

https://www.debian.org/security/2022/dsa-5073

Vendor Advisories for CVE-2022-22822(9)

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

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulib64expat1 (2.1.0-7ubuntu0.16.04.5+esm2) @ xenial2026-05-26ubuntu
ubuntulibxmltok1-dev (1.2-3ubuntu0.16.04.1~esm2) @ xenial2026-05-26ubuntu
ubuntulibxmltok1t64 (1.2-4.1ubuntu3.1) @ oracular2026-05-26ubuntu
redhatexpat-0:2.2.10-1.el8_22025-12-09redhat
redhatexpat-0:2.2.10-1.el8_42025-12-04redhat
redhatxmlrpc-c-0:1.51.0-8.el82022-11-08redhat
redhatexpat2022-10-26redhat
redhatexpat-0:2.2.10-12.el9_02022-05-17redhat
redhatexpat-0:2.1.0-14.el7_92022-03-28redhat
redhatexpat-0:2.2.5-4.el8_5.32022-03-16redhat
redhatthunderbird-0:91.7.0-2.el8_52022-03-14redhat
redhatthunderbird-0:91.7.0-2.el7_92022-03-14redhat
redhatfirefox-0:91.7.0-3.el8_52022-03-10redhat
redhatfirefox-0:91.7.0-3.el7_92022-03-10redhat

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(1)

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

Additional Vendor Advisories

(6)

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 / 46× 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 102 total refreshes for this CVE.

  1. 2026-07-22 22:55 UTCEG score recompute
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Frequently asked(5)

What is CVE-2022-22822?
CVE-2022-22822 is a critical vulnerability published on January 10, 2022. addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
When was CVE-2022-22822 disclosed?
CVE-2022-22822 was first published in the National Vulnerability Database on January 10, 2022, with the most recent update on May 5, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-22822 actively exploited?
CVE-2022-22822 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-22822?
CVE-2022-22822 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2022-22822?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-22822, 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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