CVE-2026-47254

MEDIUMPre-NVD 6.16.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (4th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
6.1EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, Track::init_sample_timing_table() in libheif/sequences/track.cc stores an out-of-bounds chunk index (m_chunks.size()) into m_presentation_timeline when the number of chunks defined in the stco box is less than the number of samples in stsz. A subsequent call to heif_track_get_next_raw_sequence_sample() reads m_chunks[chunk_idx] with that OOB index, causing a heap-buffer-overflow. Version 1.22.0 fixes the issue.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

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 (value × EchelonGraph’s weight)
Severity61% × 45%
The EG Score, 6.1 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 21, 2026

Last Modified

July 27, 2026

Advisory Details (1)

Auto-updated Jul 22, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Heap Buffer Overflow in `Track::get_next_sample_raw_data()` -- OOB Chunk Vector Access · Advisory · strukturag/libheif · GitHub

https://github.com/strukturag/libheif/security/advisories/GHSA-wqjg-4x9g-6cvg

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibheif1 (1.21.2-3ubuntu0.3) @ resolute2026-10-04ubuntu

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

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libheif1.11.0-1 ... 1.23.1-1 (39 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libheif1.15.1-1 ... 1.23.4-1~deb13u1 (37 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libheif1.19.8-1 ... 1.21.2-4 (8 versions)
  • every version up to 1.23.1-1: fixed in 1.23.1-1
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 44× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 173 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 73 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-10-12 16:02 UTCEG score recompute
  4. 2026-10-11 19:44 UTCEG score recompute
  5. 2026-10-11 16:59 UTCEG score recompute
  6. 2026-10-11 14:24 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  15. 2026-10-04 14:46 UTCEG score recompute
  16. 2026-10-04 14:46 UTCVendor advisory
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  18. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  19. 2026-10-01 07:25 UTCEG score recompute
  20. 2026-10-01 07:25 UTCVendor advisory
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  23. 2026-09-28 06:03 UTCEG score recompute
  24. 2026-09-28 06:03 UTCVendor advisory
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 4th percentile
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  2. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-09-24 03:20 UTCEG score recompute
  4. 2026-09-24 03:20 UTCVendor advisory
  5. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  6. 2026-09-23 01:21 UTCEG score recompute
  7. 2026-09-23 01:21 UTCVendor advisory
  8. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  9. 2026-09-20 05:54 UTCEG score recompute
  10. 2026-09-20 05:54 UTCVendor advisory
  11. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  12. 2026-09-18 08:15 UTCEG score recompute
  13. 2026-09-18 08:15 UTCVendor advisory
  14. 2026-09-17 10:25 UTCEG score recompute
  15. 2026-09-17 10:25 UTCVendor advisory
  16. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  17. 2026-09-16 12:34 UTCEG score recompute
  18. 2026-09-16 12:34 UTCVendor advisory
  19. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  20. 2026-09-14 02:59 UTCEG score recompute
  21. 2026-09-14 02:59 UTCVendor advisory
  22. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  23. 2026-09-13 05:07 UTCEG score recompute
  24. 2026-09-13 05:07 UTCVendor advisory
  25. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  26. 2026-09-12 07:10 UTCEG score recompute
  27. 2026-09-12 07:10 UTCVendor advisory
  28. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  29. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  30. 2026-09-11 08:53 UTCEG score recompute
  31. 2026-09-11 08:53 UTCVendor advisory
  32. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  33. 2026-09-09 11:11 UTCEG score recompute
  34. 2026-09-09 11:11 UTCVendor advisory
  35. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  36. 2026-09-07 22:28 UTCEG score recompute
  37. 2026-09-07 22:28 UTCVendor advisory
  38. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  39. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  40. 2026-09-06 10:39 UTCEG score recompute
  41. 2026-09-06 10:39 UTCVendor advisory
  42. 2026-09-05 08:26 UTCEG score recompute
  43. 2026-09-05 08:26 UTCVendor advisory
  44. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  45. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  46. 2026-09-02 00:55 UTCEG score recompute
  47. 2026-09-02 00:55 UTCVendor advisory
  48. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  49. 2026-08-31 00:00 UTCEG score recompute
  50. 2026-08-31 00:00 UTCVendor advisory
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  52. 2026-08-30 02:09 UTCEG score recompute
  53. 2026-08-30 02:09 UTCVendor advisory
  54. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  55. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  56. 2026-08-27 21:16 UTCEG score recompute
  57. 2026-08-27 21:16 UTCVendor advisory
  58. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  59. 2026-08-26 21:27 UTCEG score recompute
  60. 2026-08-26 21:27 UTCVendor advisory
  61. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  62. 2026-08-25 18:43 UTCEG score recompute
  63. 2026-08-25 18:43 UTCVendor advisory
  64. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  65. 2026-08-24 20:53 UTCEG score recompute
  66. 2026-08-24 20:53 UTCVendor advisory
  67. 2026-08-23 23:02 UTCVendor advisory
  68. 2026-08-23 00:53 UTCVendor advisory
  69. 2026-08-22 03:02 UTCEG score recompute
  70. 2026-08-22 03:02 UTCVendor advisory
  71. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  72. 2026-08-21 05:11 UTCEG score recompute
  73. 2026-08-21 05:11 UTCVendor advisory
  74. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  75. 2026-08-20 07:20 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-47254?
CVE-2026-47254 is a medium-severity vulnerability; its CVE record was published on July 21, 2026. libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, Track::initsampletimingtable() in libheif/sequences/track.cc stores an out-of-bounds chunk index (mchunks.size()) into mpresentationtimeline when the number of chunks defined in the stco box is less than the number…
When was the CVE record for CVE-2026-47254 published?
The CVE record for CVE-2026-47254 was published on July 21, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 27, 2026; the record at its source may have been updated since.
Is CVE-2026-47254 actively exploited?
CVE-2026-47254 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-47254?
CVE-2026-47254 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-47254?
A fix for CVE-2026-47254 is available: update to the fixed version the vendor names in its advisory.

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