CVE-2026-84449

LOWPre-NVD 3.73.7
EchelonGraph scoreMEDIUM confidence

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

This low-severity CVE scores 3.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (35th 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 — 4 sources updated this weekElevated

Also known asEUVD-2026-83025 (ENISA EUVD)Source: ENISA EUVD

3.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (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: 0.4%CVSS: 3.7Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6, Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an integer width that can overflow for extremely large RGB images created through heif_image_create() and heif_image_add_plane(). The resulting wrapped stride causes the conversion loop in libheif/color-conversion/rgb2yuv.cc to compute an invalid input pointer and read beyond the allocated interleaved plane while heif_context_encode_image() performs RGB-to-YCbCr conversion. This can crash the encoding process. This issue is fixed in version 1.19.6.

CVSS v3
3.7
EG Score
3.7LOWmedium confidence
EG Risk
33
EG Risk 33/100

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)
Severity37% × 45%
Impact severity (EG Severity): CVSS 3.7 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.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
0.4%
EPSS %ILE
35th
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 (3.7): severity, escalated by confirmed exploitation. This CVE's 3.7 is its impact severity (EG Severity), not escalated.

EG Severity
3.7 LOWCVSS-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
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). 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; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade 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; Track* at high (mission-essential systems).

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

Exploitation public PoC (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.

The score's inputs: 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

September 18, 2026

Last Modified

September 22, 2026

References (3)

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibheif1 (1.17.6-1ubuntu4.9) @ noble2026-10-29ubuntu

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 (36 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libheif—
  • every version up to 1.19.7-1: fixed in 1.19.7-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libheif—
  • every version up to 1.19.7-1: fixed in 1.19.7-1
—

Weakness Classification(2)

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 10× in last 7d / 43× 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.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  4. 2026-10-29 18:15 UTCEG score recompute
  5. 2026-10-29 18:15 UTCVendor advisory
  6. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  7. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-27 08:55 UTCOSV refresh
  10. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-10-25 13:56 UTCEG score recompute
  13. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  14. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  15. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  16. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-10-18 03:06 UTCEG score recompute
  21. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  25. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
Show 39 more
  1. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-12 14:53 UTCEG score recompute
  3. 2026-10-11 22:34 UTCVendor advisory
  4. 2026-10-11 19:18 UTCEG score recompute
  5. 2026-10-11 16:35 UTCEG score recompute
  6. 2026-10-11 13:52 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-10-08 17:30 UTCEG score recompute
  11. 2026-10-08 17:30 UTCVendor advisory
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  16. 2026-10-05 11:39 UTCEG score recompute
  17. 2026-10-05 11:39 UTCVendor advisory
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  19. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  20. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  21. 2026-10-02 06:35 UTCEG score recompute
  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  23. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  24. 2026-09-29 01:29 UTCEG score recompute
  25. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  26. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  27. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  28. 2026-09-25 20:25 UTCEG score recompute
  29. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  30. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  31. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  32. 2026-09-22 15:20 UTCEG score recompute
  33. 2026-09-22 14:55 UTCEG score recompute
  34. 2026-09-21 21:29 UTCEG score recompute
  35. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  36. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  37. 2026-09-18 16:25 UTCEG score recompute
  38. 2026-09-18 16:15 UTCEG score recomputeFirst assessed: 3.7 LOW
  39. 2026-09-18 16:14 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-84449?
CVE-2026-84449 is a low-severity vulnerability; its CVE record was published on September 18, 2026. libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6, Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an integer width that can overflow for extremely large RGB images created through heif_image_create() and heif_image_add_plane(). The resulting…
When was the CVE record for CVE-2026-84449 published?
The CVE record for CVE-2026-84449 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 22, 2026; the record at its source may have been updated since.
Is CVE-2026-84449 actively exploited?
CVE-2026-84449 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-84449?
CVE-2026-84449 has a CVSS base score of 3.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-84449?
A fix for CVE-2026-84449 is available: update to the fixed version the vendor names in its advisory.

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