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 70% 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
30%
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(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
ubuntulibxfont2 (1:2.0.3-1ubuntu0.20.04.1~esm2) @ focal2026-07-27ubuntu

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

(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 14× in last 7d / 58× 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. 2026-07-27 01:26 UTCEG score recompute
  2. 2026-07-27 01:26 UTCVendor advisory
  3. 2026-07-27 01:26 UTCGHSA enrichment
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 12:29 UTCEG score recompute
  6. 2026-07-26 12:29 UTCVendor advisory
  7. 2026-07-26 12:29 UTCGHSA enrichment
  8. 2026-07-25 14:18 UTCEPSS rescore
  9. 2026-07-24 14:18 UTCEPSS rescore
  10. 2026-07-23 14:18 UTCEPSS rescore
  11. 2026-07-23 03:20 UTCEG score recompute▲ 0.30
  12. 2026-07-22 14:08 UTCEPSS rescore
  13. 2026-07-21 15:25 UTCEPSS rescore
  14. 2026-07-20 17:08 UTCEPSS rescore
  15. 2026-07-19 14:31 UTCEPSS rescore
  16. 2026-07-19 14:31 UTCEPSS rescore
  17. 2026-07-19 02:29 UTCEPSS rescore
  18. 2026-07-18 10:04 UTCEPSS rescore
  19. 2026-07-17 01:25 UTCVendor advisory
  20. 2026-07-17 01:25 UTCGHSA enrichment
  21. 2026-07-16 17:03 UTCEPSS rescore
  22. 2026-07-16 12:26 UTCVendor advisory
  23. 2026-07-16 12:26 UTCGHSA enrichment
  24. 2026-07-15 23:29 UTCVendor advisory
  25. 2026-07-15 23:29 UTCGHSA enrichment
Show 33 more
  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 10:32 UTCVendor advisory
  4. 2026-07-15 10:31 UTCGHSA enrichment
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-15 02:00 UTCEPSS rescore
  7. 2026-07-14 21:33 UTCVendor advisory
  8. 2026-07-14 21:33 UTCGHSA enrichment
  9. 2026-07-14 08:36 UTCVendor advisory
  10. 2026-07-14 08:36 UTCGHSA enrichment
  11. 2026-07-13 22:31 UTCEPSS rescore
  12. 2026-07-13 19:36 UTCGHSA enrichment
  13. 2026-07-13 06:38 UTCGHSA enrichment
  14. 2026-07-13 06:13 UTCEPSS rescore
  15. 2026-07-13 06:13 UTCEPSS rescore
  16. 2026-07-12 17:39 UTCGHSA enrichment
  17. 2026-07-12 05:46 UTCEPSS rescore
  18. 2026-07-12 04:42 UTCGHSA enrichment
  19. 2026-07-11 15:45 UTCGHSA enrichment
  20. 2026-07-11 08:27 UTCEPSS rescore
  21. 2026-07-11 08:27 UTCEPSS rescore
  22. 2026-07-11 02:48 UTCGHSA enrichment
  23. 2026-07-10 13:51 UTCGHSA enrichment
  24. 2026-07-10 00:53 UTCGHSA enrichment
  25. 2026-07-09 19:48 UTCNVD updateCVSS v3 → 8.8
  26. 2026-07-09 19:10 UTCEPSS rescore
  27. 2026-07-09 19:10 UTCEPSS rescore
  28. 2026-07-09 11:55 UTCGHSA enrichment
  29. 2026-07-08 22:58 UTCGHSA enrichment
  30. 2026-07-08 15:16 UTCEPSS rescore
  31. 2026-07-08 15:16 UTCEPSS rescore
  32. 2026-07-08 10:01 UTCEG score recompute
  33. 2026-07-08 10:00 UTCMITRE cvelistV5first tracked

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 70.1% 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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