CVE-2026-84447

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (44th 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
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-83023 (ENISA EUVD)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.1 and earlier, crafted grid, iovl, and iden reference graphs can repeatedly decode the same base image because processed_ids is copied per branch and ImageItem::decode_image() has no shared operation budget. This vulnerability is fixed in 1.23.2.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Sep 18, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Security report: Derived-image indirect reference chains and tiled offsets bypass decode caching and MemoryHandle limits, causing CPU/memory amplification DoS · Advisory · strukturag/libheif · GitHub

https://github.com/strukturag/libheif/security/advisories/GHSA-x8xm-cm2c-cfc8
GitHub release Patch Available

v1.23.2 - security release

Patch available: strukturag/libheif v1.23.2

https://github.com/strukturag/libheif/releases/tag/v1.23.2
GitHub commit Patch Available

commit 30b52a4e829e (strukturag/libheif)

Patch available: strukturag/libheif v1.23.2 (contains commit 30b52a4e829e)

https://github.com/strukturag/libheif/commit/30b52a4e829efe0ee6d7208e8500b99f664af5e9

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibheif1 (1.21.2-3ubuntu0.6) @ resolute2026-10-27ubuntu

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.

Affected Packages

(3 across 3 ecosystems)
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:13(1)
PackageVulnerable rangeFix by version rangeDependents
libheif1.19.8-1 ... 1.23.3-1 (12 versions)
  • every version up to 1.23.4-1~deb13u1: fixed in 1.23.4-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libheif1.19.8-1 ... 1.23.1-1 (9 versions)
  • every version up to 1.23.2-1: fixed in 1.23.2-1
—

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 9× in last 7d / 66× 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 104 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 4 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  5. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-10-27 17:37 UTCEG score recompute
  8. 2026-10-27 17:37 UTCVendor advisory
  9. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-10-25 13:56 UTCEG score recompute
  13. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-10-19 18:02 UTCEG score recompute
  19. 2026-10-19 18:02 UTCVendor advisory
  20. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  22. 2026-10-18 03:06 UTCEG score recompute
  23. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  25. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
Show 75 more
  1. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-13 05:36 UTCEG score recompute
  4. 2026-10-13 05:36 UTCVendor advisory
  5. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-10-12 14:53 UTCEG score recompute
  7. 2026-10-11 19:18 UTCEG score recompute
  8. 2026-10-11 18:35 UTCVendor advisory
  9. 2026-10-11 16:35 UTCEG score recompute
  10. 2026-10-11 13:52 UTCEG score recompute
  11. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-10-11 06:41 UTCEG score recompute
  13. 2026-10-11 06:41 UTCVendor advisory
  14. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-10 07:22 UTCEG score recompute
  16. 2026-10-10 07:22 UTCVendor advisory
  17. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-10-09 19:43 UTCVendor advisory
  19. 2026-10-09 08:04 UTCVendor advisory
  20. 2026-10-08 20:25 UTCEG score recompute
  21. 2026-10-08 20:25 UTCVendor advisory
  22. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-08 08:44 UTCEG score recompute
  24. 2026-10-08 08:44 UTCVendor advisory
  25. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  26. 2026-10-07 21:05 UTCVendor advisory
  27. 2026-10-07 09:26 UTCVendor advisory
  28. 2026-10-06 21:47 UTCEG score recompute
  29. 2026-10-06 21:47 UTCVendor advisory
  30. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  31. 2026-10-06 10:09 UTCVendor advisory
  32. 2026-10-05 22:03 UTCEG score recompute
  33. 2026-10-05 22:03 UTCVendor advisory
  34. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  35. 2026-10-05 10:25 UTCEG score recompute
  36. 2026-10-05 10:25 UTCVendor advisory
  37. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  38. 2026-10-04 22:46 UTCVendor advisory
  39. 2026-10-04 11:07 UTCVendor advisory
  40. 2026-10-03 23:29 UTCEG score recompute
  41. 2026-10-03 23:29 UTCVendor advisory
  42. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  43. 2026-10-03 11:49 UTCVendor advisory
  44. 2026-10-02 23:59 UTCEG score recompute
  45. 2026-10-02 23:59 UTCVendor advisory
  46. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  47. 2026-10-02 12:16 UTCVendor advisory
  48. 2026-10-02 00:07 UTCEG score recompute
  49. 2026-10-02 00:07 UTCVendor advisory
  50. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  51. 2026-10-01 12:01 UTCVendor advisory
  52. 2026-10-01 00:23 UTCEG score recompute
  53. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  54. 2026-09-30 12:07 UTCVendor advisory
  55. 2026-09-30 00:27 UTCEG score recompute
  56. 2026-09-30 00:27 UTCVendor advisory
  57. 2026-09-28 23:09 UTCEG score recompute
  58. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  59. 2026-09-27 23:50 UTCEG score recompute
  60. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  61. 2026-09-27 00:32 UTCEG score recompute
  62. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  63. 2026-09-26 01:15 UTCEG score recompute
  64. 2026-09-24 14:15 UTCEG score recompute
  65. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  66. 2026-09-24 02:36 UTCEG score recompute
  67. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  68. 2026-09-23 03:19 UTCEG score recompute
  69. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  70. 2026-09-22 04:02 UTCEG score recompute
  71. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  72. 2026-09-21 04:44 UTCEG score recompute
  73. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  74. 2026-09-19 17:45 UTCEG score recompute
  75. 2026-09-18 18:27 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-84447?
CVE-2026-84447 is a high-severity vulnerability; its CVE record was published on September 18, 2026. libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.1 and earlier, crafted grid, iovl, and iden reference graphs can repeatedly decode the same base image because processed_ids is copied per branch and ImageItem::decode_image() has no shared operation budget. This vulnerability is…
When was the CVE record for CVE-2026-84447 published?
The CVE record for CVE-2026-84447 was published on September 18, 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 September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-84447 actively exploited?
CVE-2026-84447 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-84447?
CVE-2026-84447 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-84447?
A fix for CVE-2026-84447 is available: update to the fixed version the vendor names in its advisory.

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