CVE-2026-49271

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 90% 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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

June 19, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 19, 2026
Patch available. Sources: github.
github Patch Available

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 / EcosystemFixed in / PatchReleasedSource
ubuntulibheif1 (1.21.2-3ubuntu0.2) @ resolute2026-08-30ubuntu

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 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(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 5× 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.

Showing the most recent 100 of 141 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-49271?
CVE-2026-49271 is a medium vulnerability 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 CVE-2026-49271 disclosed?
CVE-2026-49271 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49271 actively exploited?
CVE-2026-49271 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 90.2% of all scored CVEs.
What is the CVSS score of CVE-2026-49271?
CVE-2026-49271 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-49271?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49271, 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.

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