CVE-2026-72522

MEDIUMPre-NVD 6.26.2—
EchelonGraph scoreHIGH confidence

Score 6.2 from GitHub Security Advisory published 2026-08-10. a secondary CVSS source baseline 6.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.2Exploit: None knownExposed: 0

A fix is available — apply it.

libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.

CVSS v3
6.2
EG Score
6.2(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity62% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

August 10, 2026

Last Modified

August 13, 2026

Advisory Details (2)

Auto-updated Aug 10, 2026
No patch confirmed yet. Sources: github_pr.
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2053153
github_pr

[CVE-REQUESTED] Fix an OOB read and the resulting infinite loop in `*_toUtf16` functions

Upstream fix in progress (PR #1296 · libexpat/libexpat, state=open)

https://github.com/libexpat/libexpat/pull/1296

Vendor Advisories for CVE-2026-72522(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatexpat-main-2.8.3-0.1.hum12026-08-14redhat

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.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 29× in last 7d / 47× 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.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 12:05 UTCEG score recompute
  3. 2026-08-20 12:05 UTCVendor advisory
  4. 2026-08-20 12:05 UTCGHSA enrichment
  5. 2026-08-19 17:04 UTCEPSS rescore
  6. 2026-08-19 12:33 UTCEG score recompute
  7. 2026-08-19 12:33 UTCVendor advisory
  8. 2026-08-19 12:33 UTCGHSA enrichment
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 13:03 UTCEG score recompute
  12. 2026-08-18 13:03 UTCVendor advisory
  13. 2026-08-18 13:03 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 13:31 UTCEG score recompute
  16. 2026-08-17 13:31 UTCVendor advisory
  17. 2026-08-17 13:31 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 14:00 UTCEG score recompute
  21. 2026-08-16 14:00 UTCVendor advisory
  22. 2026-08-16 14:00 UTCGHSA enrichment
  23. 2026-08-16 02:15 UTCEPSS rescore
  24. 2026-08-15 14:30 UTCEG score recompute
  25. 2026-08-15 14:30 UTCVendor advisory
Show 22 more
  1. 2026-08-15 14:30 UTCGHSA enrichment
  2. 2026-08-15 01:31 UTCEPSS rescore
  3. 2026-08-14 14:59 UTCEG score recompute
  4. 2026-08-14 14:59 UTCGHSA enrichment
  5. 2026-08-13 22:00 UTCEPSS rescore
  6. 2026-08-13 15:28 UTCEG score recompute
  7. 2026-08-13 15:28 UTCGHSA enrichment
  8. 2026-08-13 14:26 UTCEG score recompute
  9. 2026-08-13 14:26 UTCGHSA enrichment
  10. 2026-08-12 18:10 UTCEG score recompute
  11. 2026-08-12 18:10 UTCGHSA enrichment
  12. 2026-08-12 13:51 UTCEPSS rescore
  13. 2026-08-11 18:40 UTCEG score recompute
  14. 2026-08-11 18:40 UTCGHSA enrichment
  15. 2026-08-11 17:45 UTCEG score recompute
  16. 2026-08-11 17:45 UTCGHSA enrichment
  17. 2026-08-11 03:50 UTCEG score recompute
  18. 2026-08-11 03:50 UTCGHSA enrichment
  19. 2026-08-11 00:00 UTCEPSS rescore
  20. 2026-08-10 04:20 UTCEG score recompute
  21. 2026-08-10 03:46 UTCEG score recompute
  22. 2026-08-10 03:46 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-72522?
CVE-2026-72522 is a medium vulnerability published on August 10, 2026. libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.
When was CVE-2026-72522 disclosed?
CVE-2026-72522 was first published in the National Vulnerability Database on August 10, 2026, with the most recent update on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72522 actively exploited?
CVE-2026-72522 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.5% of all scored CVEs.
What is the CVSS score of CVE-2026-72522?
CVE-2026-72522 has a CVSS v3 base score of 6.2 (NVD).
How do I remediate CVE-2026-72522?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72522, 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.

Dependency Blast Radius

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