CVE-2026-47247

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 59% of all CVEs by exploit prediction. 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
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs in libheif chain to leak process heap memory as visible pixel values in decoded grid images. An attacker who uploads a crafted AVIF/HEIC file to any server-side image processor (WordPress, Sharp/libvips, ImageMagick, etc.) can recover heap data - including library function pointers sufficient to defeat ASLR, or any other secret - from the publicly-downloadable transcoded JPEG/PNG/WebP output. Local attack vectors are also possible. Version 1.22.0 fixes the issue.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

July 21, 2026

Last Modified

July 27, 2026

Advisory Details (1)

Auto-updated Jul 22, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel Plane Allocation · Advisory · strukturag/libheif · GitHub

https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libheif1.11.0-1 ... 1.23.1-1 (39 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libheif1.15.1-1 ... 1.23.2-1 (34 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libheif1.19.8-11.19.8-1+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libheif1.19.8-1 ... 1.21.2-4 (8 versions)1.23.1-1—

Weakness Classification(4)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 48× 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. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 09:37 UTCEPSS rescore
  3. 2026-09-11 08:54 UTCEG score recompute
  4. 2026-09-10 09:34 UTCEPSS rescore
  5. 2026-09-09 11:11 UTCEG score recompute
  6. 2026-09-08 22:00 UTCEPSS rescore
  7. 2026-09-07 22:28 UTCEG score recompute
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-05 21:00 UTCEG score recompute
  11. 2026-09-05 08:26 UTCEG score recompute
  12. 2026-09-04 05:06 UTCEPSS rescore
  13. 2026-09-02 14:12 UTCEPSS rescore
  14. 2026-09-02 00:55 UTCEG score recompute
  15. 2026-09-01 13:54 UTCEPSS rescore
  16. 2026-08-31 03:51 UTCEG score recompute
  17. 2026-08-30 19:17 UTCEPSS rescore
  18. 2026-08-30 02:10 UTCEG score recompute
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:41 UTCEPSS rescore
  21. 2026-08-27 23:47 UTCEG score recompute
  22. 2026-08-27 14:25 UTCEPSS rescore
  23. 2026-08-26 21:27 UTCEG score recompute
  24. 2026-08-26 14:46 UTCEPSS rescore
  25. 2026-08-25 19:57 UTCEG score recompute
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  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 18:47 UTCEG score recompute
  3. 2026-08-23 01:57 UTCEG score recompute
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-22 00:49 UTCEG score recompute
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-20 23:39 UTCEG score recompute
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-19 22:29 UTCEG score recompute
  10. 2026-08-19 17:04 UTCEPSS rescore
  11. 2026-08-18 19:27 UTCEG score recompute
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 17:07 UTCEG score recompute
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-16 15:57 UTCEG score recompute
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 03:23 UTCEG score recompute
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 02:14 UTCEG score recompute
  20. 2026-08-15 01:30 UTCEPSS rescore
  21. 2026-08-14 01:06 UTCEG score recompute
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-12 23:56 UTCEG score recompute
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-11 22:47 UTCEG score recompute
  26. 2026-08-11 10:11 UTCEG score recompute
  27. 2026-08-11 00:00 UTCEPSS rescore
  28. 2026-08-09 20:28 UTCEG score recompute
  29. 2026-08-09 13:46 UTCEPSS rescore
  30. 2026-08-08 19:20 UTCEG score recompute
  31. 2026-08-08 16:37 UTCEPSS rescore
  32. 2026-08-07 18:11 UTCEG score recompute
  33. 2026-08-06 17:02 UTCEG score recompute
  34. 2026-08-06 13:47 UTCEPSS rescore
  35. 2026-08-06 04:27 UTCEG score recompute
  36. 2026-08-05 19:17 UTCEPSS rescore
  37. 2026-08-05 03:18 UTCEG score recompute
  38. 2026-08-04 15:10 UTCEPSS rescore
  39. 2026-08-04 14:33 UTCEG score recompute
  40. 2026-08-04 10:39 UTCEPSS rescore
  41. 2026-08-03 13:24 UTCEG score recompute
  42. 2026-08-03 10:36 UTCEPSS rescore
  43. 2026-08-02 12:14 UTCEG score recompute
  44. 2026-08-02 02:27 UTCEPSS rescore
  45. 2026-08-01 11:03 UTCEG score recompute
  46. 2026-08-01 04:16 UTCEPSS rescore
  47. 2026-07-30 21:18 UTCEG score recompute
  48. 2026-07-30 16:28 UTCEPSS rescore
  49. 2026-07-30 07:52 UTCEG score recompute
  50. 2026-07-30 01:30 UTCEPSS rescore
  51. 2026-07-28 17:02 UTCEG score recompute
  52. 2026-07-28 15:37 UTCEPSS rescore
  53. 2026-07-27 15:23 UTCEG score recompute
  54. 2026-07-26 22:35 UTCEG score recompute
  55. 2026-07-26 14:54 UTCEPSS rescore
  56. 2026-07-26 09:58 UTCEG score recompute
  57. 2026-07-25 14:18 UTCEPSS rescore
  58. 2026-07-24 14:18 UTCEPSS rescore
  59. 2026-07-23 14:18 UTCEPSS rescore
  60. 2026-07-23 03:17 UTCEG score recompute
  61. 2026-07-22 22:56 UTCEG score recompute
  62. 2026-07-22 14:08 UTCEPSS rescore
  63. 2026-07-21 23:11 UTCEG score recompute
  64. 2026-07-21 21:38 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-47247?
CVE-2026-47247 is a high vulnerability published on July 21, 2026. libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs in libheif chain to leak process heap memory as visible pixel values in decoded grid images. An attacker who uploads a crafted AVIF/HEIC file to any server-side image processor (WordPress, Sharp/libvips,…
When was CVE-2026-47247 disclosed?
CVE-2026-47247 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47247 actively exploited?
CVE-2026-47247 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 59.1% of all scored CVEs.
What is the CVSS score of CVE-2026-47247?
CVE-2026-47247 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-47247?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47247, 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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