CVE-2026-44950

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreHIGH confidence

Score 9.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-10. a secondary CVSS source baseline 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.0Exploit: None knownExposed: 0

A fix is available — apply it.

fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.

A malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content.

CVSS v3
9.0
EG Score
9.0(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity90% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 10, 2026

Advisory Details (1)

Auto-updated Sep 10, 2026
No patch confirmed yet.
generic

Making sure you're not a bot!

https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950

Vendor Advisories for CVE-2026-44950(12)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatlibXfont2-0:2.0.3-2.el8_4.22026-09-01redhat
redhatlibXfont2-0:2.0.6-5.el10_0.22026-09-01redhat
redhatlibXfont2-0:2.0.3-3.el7_92026-09-01redhat
redhatlibXfont2-0:2.0.3-2.el8_8.22026-08-31redhat
redhatlibXfont2-0:2.0.3-12.el9_6.32026-08-31redhat
redhatlibXfont2-0:2.0.3-2.el8_6.22026-08-31redhat
redhatlibXfont2-0:2.0.3-12.el9_2.32026-08-25redhat
redhatlibXfont2-0:2.0.3-12.el9_4.32026-08-25redhat
redhatlibXfont2-0:2.0.6-5.el10_2.32026-08-17redhat
redhatlibXfont2-0:2.0.3-2.el8_10.32026-08-17redhat
redhatlibXfont2-0:2.0.3-12.el9_8.32026-08-17redhat

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 98× in last 7d / 170× 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 170 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Same vendor

1 shown

redhat:RHSA-2026:55446

Frequently asked(5)

What is CVE-2026-44950?
CVE-2026-44950 is a critical vulnerability published on September 10, 2026. fsreadglyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded…
When was CVE-2026-44950 disclosed?
CVE-2026-44950 was first published in the National Vulnerability Database on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44950 actively exploited?
CVE-2026-44950 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 62.5% of all scored CVEs.
What is the CVSS score of CVE-2026-44950?
CVE-2026-44950 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-44950?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44950, 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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