CVE-2026-72522

MEDIUMPre-NVD 6.26.2—
EchelonGraph scoreMEDIUM 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: 0.2%CVSS: 6.2Exploit: None knownExposed services: Not assessed

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
6.2MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 10, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 10, 2026
Patch available. 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(3)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibexpat1-dev (2.2.5-3ubuntu0.9+esm5) @ bionic2026-10-05ubuntu
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.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
expat2.5.0-1, 2.5.0-1+deb12u1, 2.5.0-1+deb12u2
  • every version up to 2.5.0-1+deb12u3: fixed in 2.5.0-1+deb12u3
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
expat2.7.1-2 ... 2.8.2-1~deb13u1 (11 versions)
  • every version up to 2.8.3-1~deb13u1: fixed in 2.8.3-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
expat2.7.1-2 ... 2.8.3-1~deb13u1 (12 versions)
  • every version up to 2.8.3-1: fixed in 2.8.3-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 19× in last 7d / 92× 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 194 total refreshes for this CVE.

  1. 2026-10-05 07:58 UTCEG score recompute
  2. 2026-10-05 07:58 UTCVendor advisory
  3. 2026-10-05 07:58 UTCGHSA enrichment
  4. 2026-10-04 23:22 UTCEPSS rescore
  5. 2026-10-04 05:38 UTCEG score recompute
  6. 2026-10-04 05:38 UTCVendor advisory
  7. 2026-10-04 05:38 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-02 09:26 UTCEG score recompute
  10. 2026-10-02 09:26 UTCVendor advisory
  11. 2026-10-02 09:26 UTCGHSA enrichment
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-09-30 22:50 UTCEG score recompute
  14. 2026-09-30 22:50 UTCVendor advisory
  15. 2026-09-30 22:50 UTCGHSA enrichment
  16. 2026-09-29 05:34 UTCEG score recompute
  17. 2026-09-29 05:34 UTCVendor advisory
  18. 2026-09-29 05:34 UTCGHSA enrichment
  19. 2026-09-28 13:52 UTCEPSS rescore
  20. 2026-09-27 17:02 UTCEG score recompute
  21. 2026-09-27 17:02 UTCVendor advisory
  22. 2026-09-27 17:02 UTCGHSA enrichment
  23. 2026-09-27 13:48 UTCEPSS rescore
  24. 2026-09-26 15:59 UTCEPSS rescore
  25. 2026-09-25 04:09 UTCEG score recompute
Show 75 more
  1. 2026-09-25 04:09 UTCVendor advisory
  2. 2026-09-25 04:09 UTCGHSA enrichment
  3. 2026-09-24 02:10 UTCEG score recompute
  4. 2026-09-24 02:10 UTCVendor advisory
  5. 2026-09-24 02:10 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 02:40 UTCEG score recompute
  8. 2026-09-23 02:40 UTCVendor advisory
  9. 2026-09-23 02:40 UTCGHSA enrichment
  10. 2026-09-22 03:09 UTCEG score recompute
  11. 2026-09-22 03:09 UTCVendor advisory
  12. 2026-09-22 03:09 UTCGHSA enrichment
  13. 2026-09-21 21:09 UTCEPSS rescore
  14. 2026-09-21 03:36 UTCEG score recompute
  15. 2026-09-21 03:36 UTCVendor advisory
  16. 2026-09-21 03:36 UTCGHSA enrichment
  17. 2026-09-20 20:16 UTCEPSS rescore
  18. 2026-09-20 00:52 UTCEG score recompute
  19. 2026-09-20 00:52 UTCVendor advisory
  20. 2026-09-20 00:52 UTCGHSA enrichment
  21. 2026-09-19 01:18 UTCEG score recompute
  22. 2026-09-19 01:18 UTCVendor advisory
  23. 2026-09-19 01:18 UTCGHSA enrichment
  24. 2026-09-18 19:28 UTCEPSS rescore
  25. 2026-09-18 01:46 UTCEG score recompute
  26. 2026-09-18 01:46 UTCVendor advisory
  27. 2026-09-18 01:46 UTCGHSA enrichment
  28. 2026-09-17 02:15 UTCEG score recompute
  29. 2026-09-17 02:15 UTCVendor advisory
  30. 2026-09-17 02:15 UTCGHSA enrichment
  31. 2026-09-16 14:08 UTCEPSS rescore
  32. 2026-09-16 05:15 UTCEPSS rescore
  33. 2026-09-16 02:44 UTCEG score recompute
  34. 2026-09-16 02:44 UTCVendor advisory
  35. 2026-09-16 02:44 UTCGHSA enrichment
  36. 2026-09-15 03:12 UTCEPSS rescore
  37. 2026-09-15 03:10 UTCVendor advisory
  38. 2026-09-15 03:10 UTCGHSA enrichment
  39. 2026-09-14 03:40 UTCEG score recompute
  40. 2026-09-14 03:40 UTCVendor advisory
  41. 2026-09-14 03:40 UTCGHSA enrichment
  42. 2026-09-13 04:09 UTCEG score recompute
  43. 2026-09-13 04:09 UTCVendor advisory
  44. 2026-09-13 04:09 UTCGHSA enrichment
  45. 2026-09-12 15:02 UTCEPSS rescore
  46. 2026-09-12 04:37 UTCEG score recompute
  47. 2026-09-12 04:37 UTCVendor advisory
  48. 2026-09-12 04:37 UTCGHSA enrichment
  49. 2026-09-11 14:53 UTCEPSS rescore
  50. 2026-09-11 05:00 UTCEG score recompute
  51. 2026-09-11 05:00 UTCVendor advisory
  52. 2026-09-11 05:00 UTCGHSA enrichment
  53. 2026-09-10 09:35 UTCEPSS rescore
  54. 2026-09-10 05:30 UTCEG score recompute
  55. 2026-09-10 05:30 UTCVendor advisory
  56. 2026-09-10 05:29 UTCGHSA enrichment
  57. 2026-09-09 05:57 UTCEG score recompute
  58. 2026-09-09 05:57 UTCVendor advisory
  59. 2026-09-09 05:57 UTCGHSA enrichment
  60. 2026-09-08 22:01 UTCEPSS rescore
  61. 2026-09-07 17:34 UTCEG score recompute
  62. 2026-09-07 17:34 UTCVendor advisory
  63. 2026-09-07 17:34 UTCGHSA enrichment
  64. 2026-09-06 13:48 UTCEPSS rescore
  65. 2026-09-06 02:51 UTCEG score recompute
  66. 2026-09-06 02:51 UTCVendor advisory
  67. 2026-09-06 02:51 UTCGHSA enrichment
  68. 2026-09-05 03:20 UTCEG score recompute
  69. 2026-09-05 03:20 UTCVendor advisory
  70. 2026-09-05 03:20 UTCGHSA enrichment
  71. 2026-09-04 05:07 UTCEPSS rescore
  72. 2026-09-04 03:26 UTCVendor advisory
  73. 2026-09-04 03:26 UTCGHSA enrichment
  74. 2026-09-03 03:54 UTCEG score recompute
  75. 2026-09-03 03:54 UTCVendor advisory

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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 on August 10, 2026, with the most recent update on August 31, 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 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-72522?
CVE-2026-72522 has a CVSS base score of 6.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-72522?
A fix for CVE-2026-72522 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-72522 are linked in the Vendor Advisories panel on this page.

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