CVE-2026-88807

HIGHPre-NVD 8.98.9—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (16th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
8.9EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.9Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients.

CVSS v3
8.9
EG Score
8.9HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity89% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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

September 21, 2026

Last Modified

September 22, 2026

Advisory Details (1)

Auto-updated Sep 21, 2026
No patch confirmed yet.
generic

Check numSubpixel against numScreens to avoid OOB writes (CVE-2026-88807) (!19) · Merge requests · xorg / lib / libXrender · GitLab

https://gitlab.freedesktop.org/xorg/lib/libxrender/-/merge_requests/19

Vendor Advisories for CVE-2026-88807(2)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 40× in last 7d / 78× 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. 2026-10-04 09:48 UTCVendor advisory
  2. 2026-10-04 09:48 UTCGHSA enrichment
  3. 2026-10-03 20:38 UTCEG score recompute
  4. 2026-10-03 20:38 UTCVendor advisory
  5. 2026-10-03 20:38 UTCGHSA enrichment
  6. 2026-10-03 07:26 UTCVendor advisory
  7. 2026-10-03 07:26 UTCGHSA enrichment
  8. 2026-10-02 18:17 UTCVendor advisory
  9. 2026-10-02 18:17 UTCEG score recompute
  10. 2026-10-02 18:17 UTCGHSA enrichment
  11. 2026-10-02 18:17 UTCVendor advisory
  12. 2026-10-02 18:17 UTCGHSA enrichment
  13. 2026-10-02 05:00 UTCEG score recompute
  14. 2026-10-02 05:00 UTCVendor advisory
  15. 2026-10-02 05:00 UTCGHSA enrichment
  16. 2026-10-01 19:51 UTCEPSS rescore
  17. 2026-10-01 15:48 UTCVendor advisory
  18. 2026-10-01 15:48 UTCGHSA enrichment
  19. 2026-10-01 02:39 UTCEG score recompute
  20. 2026-10-01 02:39 UTCVendor advisory
  21. 2026-10-01 02:39 UTCGHSA enrichment
  22. 2026-09-30 15:04 UTCEPSS rescore
  23. 2026-09-30 13:31 UTCVendor advisory
  24. 2026-09-30 13:30 UTCGHSA enrichment
  25. 2026-09-30 00:21 UTCEG score recompute
Show 53 more
  1. 2026-09-30 00:21 UTCVendor advisory
  2. 2026-09-30 00:21 UTCGHSA enrichment
  3. 2026-09-29 09:49 UTCEG score recompute
  4. 2026-09-29 09:49 UTCVendor advisory
  5. 2026-09-29 09:49 UTCGHSA enrichment
  6. 2026-09-28 20:40 UTCEG score recompute
  7. 2026-09-28 20:40 UTCVendor advisory
  8. 2026-09-28 20:40 UTCGHSA enrichment
  9. 2026-09-28 13:52 UTCEPSS rescore
  10. 2026-09-28 07:31 UTCVendor advisory
  11. 2026-09-28 07:31 UTCGHSA enrichment
  12. 2026-09-27 18:21 UTCEG score recompute
  13. 2026-09-27 18:21 UTCVendor advisory
  14. 2026-09-27 18:21 UTCGHSA enrichment
  15. 2026-09-27 13:48 UTCEPSS rescore
  16. 2026-09-27 05:12 UTCVendor advisory
  17. 2026-09-27 05:12 UTCGHSA enrichment
  18. 2026-09-26 16:00 UTCEG score recompute
  19. 2026-09-26 16:00 UTCVendor advisory
  20. 2026-09-26 16:00 UTCGHSA enrichment
  21. 2026-09-26 15:59 UTCEPSS rescore
  22. 2026-09-26 02:48 UTCEG score recompute
  23. 2026-09-26 02:48 UTCVendor advisory
  24. 2026-09-26 02:48 UTCGHSA enrichment
  25. 2026-09-25 13:37 UTCVendor advisory
  26. 2026-09-25 13:37 UTCGHSA enrichment
  27. 2026-09-25 00:28 UTCEG score recompute
  28. 2026-09-25 00:28 UTCVendor advisory
  29. 2026-09-25 00:28 UTCGHSA enrichment
  30. 2026-09-24 14:04 UTCEPSS rescore
  31. 2026-09-24 11:19 UTCVendor advisory
  32. 2026-09-24 11:19 UTCGHSA enrichment
  33. 2026-09-23 22:10 UTCEG score recompute
  34. 2026-09-23 22:10 UTCVendor advisory
  35. 2026-09-23 22:10 UTCGHSA enrichment
  36. 2026-09-23 17:54 UTCEPSS rescore
  37. 2026-09-23 09:01 UTCVendor advisory
  38. 2026-09-23 09:01 UTCGHSA enrichment
  39. 2026-09-22 19:52 UTCVendor advisory
  40. 2026-09-22 19:52 UTCGHSA enrichment
  41. 2026-09-22 17:40 UTCEG score recompute
  42. 2026-09-22 17:40 UTCVendor advisory
  43. 2026-09-22 17:40 UTCGHSA enrichment
  44. 2026-09-22 16:01 UTCEPSS rescore
  45. 2026-09-22 04:32 UTCEG score recompute
  46. 2026-09-22 04:31 UTCGHSA enrichment
  47. 2026-09-22 04:01 UTCEG score recompute
  48. 2026-09-22 04:01 UTCGHSA enrichment
  49. 2026-09-21 15:22 UTCEG score recompute
  50. 2026-09-21 14:57 UTCEG score recompute
  51. 2026-09-21 14:21 UTCEG score recompute
  52. 2026-09-21 14:00 UTCEG score recompute
  53. 2026-09-21 14:00 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88807?
CVE-2026-88807 is a high vulnerability published on September 21, 2026. A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients.
When was CVE-2026-88807 disclosed?
CVE-2026-88807 was first published on September 21, 2026, with the most recent update on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88807 actively exploited?
CVE-2026-88807 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88807?
CVE-2026-88807 has a CVSS base score of 8.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-88807?
No fix for CVE-2026-88807 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-88807 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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