CVE-2026-56003

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 9, 2026

Advisory Details (2)

Auto-updated Jul 8, 2026
No patch confirmed yet.
generic

oss-security - FW: X.Org Security Advisory: multiple security issues in libXfont2

https://www.openwall.com/lists/oss-security/2026/07/08/1
generic

bitscale: add bounds check to computeProps for property buffer (dff957a5) · Commits · xorg / lib / libXfont · GitLab

https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/dff957a5158da038a282a59a31fe736702732939

Vendor Advisories for CVE-2026-56003(7)

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

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibxfont1 (1:1.4.7-1ubuntu0.4+esm2) @ trusty2026-08-30ubuntu
redhatlibXfont2-0:2.0.3-12.el9_6.12026-08-06redhat
redhatlibXfont2-0:2.0.6-5.el10_0.12026-08-06redhat
redhatlibXfont2-0:2.0.3-2.el7_92026-08-06redhat
redhatlibXfont2-0:2.0.3-2.el8_6.12026-08-06redhat
redhatlibXfont2-0:2.0.3-2.el8_8.12026-08-06redhat
redhatlibXfont2-0:2.0.3-12.el9_4.12026-08-06redhat
redhatlibXfont2-0:2.0.3-2.el8_4.12026-08-06redhat
redhatlibXfont2-0:2.0.3-12.el9_2.12026-08-06redhat
redhatlibXfont2-0:2.0.3-2.el8_10.12026-07-28redhat

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libxfont1:2.0.4-11:2.0.4-1+deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libxfont1:2.0.6-11:2.0.6-1+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libxfont1:2.0.6-11:2.0.6-1+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libxfont1:2.0.6-1, 1:2.0.6-1+hurd.1, 1:2.0.6-21:2.0.8-1—

Weakness Classification(1)

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 27× in last 7d / 156× 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 236 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-56003?
CVE-2026-56003 is a high vulnerability published on July 8, 2026. A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.
When was CVE-2026-56003 disclosed?
CVE-2026-56003 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56003 actively exploited?
CVE-2026-56003 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 67.0% of all scored CVEs.
What is the CVSS score of CVE-2026-56003?
CVE-2026-56003 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-56003?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56003, 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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