CVE-2026-49271

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (28th 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-2026-38055 (ENISA EUVD)Source: ENISA EUVD

6.5EG
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: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unit_offset + unit_size. Because the addition can wrap, a crafted HEIF file can pass the range check and then construct a vector from iterators outside the compressed item buffer, producing an out-of-bounds heap read and crash. Version 1.22.1 patches the issue.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100

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)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 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.
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
28th
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 (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-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 2026-10-25). 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: 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.

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

June 19, 2026

Last Modified

October 25, 2026

Advisory Details (1)

Auto-updated Jun 19, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Wrapped icef compressed-unit range check causes out-of-bounds read in uncompressed HEIF decoder · Advisory · strukturag/libheif · GitHub

https://github.com/strukturag/libheif/security/advisories/GHSA-r7qj-cg5r-r6vf

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibheif1 (1.20.2-1ubuntu0.5) @ questing2026-10-25ubuntu

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

(4 across 4 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:13(1)
PackageVulnerable rangeFix by version rangeDependents
libheif1.19.8-1
  • every version up to 1.19.8-1+deb13u1: fixed in 1.19.8-1+deb13u1
—
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 10× in last 7d / 37× 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 189 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 89 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-10-25 23:34 UTCEG score recompute
  4. 2026-10-25 23:34 UTCVendor advisory
  5. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  6. 2026-10-25 14:22 UTCEG score recompute
  7. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  8. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  9. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  10. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  11. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  12. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  13. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  14. 2026-10-18 03:34 UTCEG score recompute
  15. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  16. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  17. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  18. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  19. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  20. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  21. 2026-10-12 16:00 UTCEG score recompute
  22. 2026-10-11 19:43 UTCEG score recompute
  23. 2026-10-11 16:57 UTCEG score recompute
  24. 2026-10-11 14:21 UTCEG score recompute
  25. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 27th percentile
Show 75 more
  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  3. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  4. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  5. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  6. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  7. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  8. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  9. 2026-10-02 15:10 UTCOSV refresh
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  11. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  12. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  13. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  14. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  15. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  16. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  17. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  18. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  19. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  20. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  21. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  22. 2026-09-13 13:10 UTCEG score recompute
  23. 2026-09-13 13:10 UTCVendor advisory
  24. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  25. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  26. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  27. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  28. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  29. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  30. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  31. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  32. 2026-08-30 20:49 UTCEG score recompute
  33. 2026-08-30 20:49 UTCVendor advisory
  34. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  35. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  36. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  37. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  38. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  39. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  40. 2026-08-25 03:10 UTCEG score recompute
  41. 2026-08-25 03:10 UTCVendor advisory
  42. 2026-08-24 01:30 UTCEG score recompute
  43. 2026-08-24 01:30 UTCVendor advisory
  44. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  45. 2026-08-22 23:51 UTCEG score recompute
  46. 2026-08-22 23:51 UTCVendor advisory
  47. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  48. 2026-08-21 10:44 UTCEG score recompute
  49. 2026-08-21 10:44 UTCVendor advisory
  50. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  51. 2026-08-20 08:56 UTCEG score recompute
  52. 2026-08-20 08:56 UTCVendor advisory
  53. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  54. 2026-08-19 07:18 UTCEG score recompute
  55. 2026-08-19 07:18 UTCVendor advisory
  56. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  57. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  58. 2026-08-17 12:29 UTCEG score recompute
  59. 2026-08-17 12:29 UTCVendor advisory
  60. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  61. 2026-08-16 10:31 UTCEG score recompute
  62. 2026-08-16 10:31 UTCVendor advisory
  63. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  64. 2026-08-15 08:53 UTCEG score recompute
  65. 2026-08-15 08:53 UTCVendor advisory
  66. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  67. 2026-08-14 06:52 UTCEG score recompute
  68. 2026-08-14 06:52 UTCVendor advisory
  69. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  70. 2026-08-13 05:14 UTCEG score recompute
  71. 2026-08-13 05:14 UTCVendor advisory
  72. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  73. 2026-08-12 03:37 UTCEG score recompute
  74. 2026-08-12 03:37 UTCVendor advisory
  75. 2026-08-11 01:59 UTCEG score recompute

Related CVEs(same product + same vendor + same CWE)

Same vendor

1 shown

ubuntu:USN-8479-1

Frequently asked(5)

What is CVE-2026-49271?
CVE-2026-49271 is a medium-severity vulnerability; its CVE record was published on June 19, 2026. libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unitoffset + unitsize. Because the addition can wrap, a crafted HEIF file can pass the range check and then construct a vector…
When was the CVE record for CVE-2026-49271 published?
The CVE record for CVE-2026-49271 was published on June 19, 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 October 25, 2026; the record at its source may have been updated since.
Is CVE-2026-49271 actively exploited?
CVE-2026-49271 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-49271?
CVE-2026-49271 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-49271?
A fix for CVE-2026-49271 is available: update to the fixed version the vendor names in its advisory.

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