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NVD / CVE Program· CNA GitHub_M

CVE-2026-49271: libheif: Wrapped icef compressed-unit range check causes out-of-bounds read in uncompressed HEIF decoder

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.35% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: libheif (Debian:13) 1.19.8-1+deb13u1; libheif (Debian:14) 1.23.1-1; libheif (openSUSE:Leap 16.0) 1.23.0-160000.1.1.

Low priority for now. Upgrade to libheif (Debian:13) 1.19.8-1+deb13u1; libheif (Debian:14) 1.23.1-1; libheif (openSUSE:Leap 16.0) 1.23.0-160000.1.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Jun 19, 2026
Updated
Oct 25, 2026
EPSS
0.3% · 29th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
6.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-49271

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
strukturlibheif

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • struktur libheifbefore 1.22.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • strukturag libheif

    • < 1.22.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12libheiffrom 0—
Debian:13libheifbefore 1.19.8-1+deb13u11.19.8-1+deb13u1
Debian:14libheifbefore 1.23.1-11.23.1-1
openSUSE:Leap 16.0libheifbefore 1.23.0-160000.1.11.23.0-160000.1.1
openSUSE:Tumbleweedlibheifbefore 1.23.0-2.11.23.0-2.1
SUSE:Linux Enterprise Module for Desktop Applications 15 SP7libheifbefore 1.23.0-150700.3.15.11.23.0-150700.3.15.1
SUSE:Linux Enterprise Server 16.0libheifbefore 1.23.0-160000.1.11.23.0-160000.1.1

Same product

struktur: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-11471libheif 1.4.0 has a use-after-free in heif::HeifContext::Image::set_alpha_channel in heif_context.h because heif_context.cc mishandles refer
    36Monitor
  • CVE-2026-32740libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing
    35Monitor
  • CVE-2023-49464libheif v1.17.5 was discovered to contain a segmentation violation via the function UncompressedImageCodec::get_luma_bits_per_pixel_from_con
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-41069May 22, 2026 · libheif allows Out-of-bounds vector access leading to invalid dereference (DoS)
    26Monitor
  • ← EarlierCVE-2026-41071May 22, 2026 · libheif: Heap buffer over-read in SampleAuxInfoReader via crafted HEIF sequence file with mismatched saiz sample count
    20Monitor
  • Later →CVE-2026-47714Jul 21, 2026 · libheif has integer overflow in inline mask size calculation that causes undersized buffer allocation
    24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:libheif1.19.8-1+deb13u1 · Debian:13Package registry (OSV)
opensuse:libheif1.23.0-2.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:libheif1.23.0-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-4802933 days apartlibheif: heap OOB read in ImageItem_Grid::decode_grid_tile via irot-induced tile-coordinate underflow
    28Monitor
  • CVE-2025-68431172 days apartlibheif has Potential Heap Buffer Over-Read
    28Monitor
  • CVE-2026-4725132 days apartlibheif has an incomplete fix for CVE-2026-3949: integer overflow bypass in vvdec_push_data2
    27Monitor
  • CVE-2026-4106928 days apartlibheif allows Out-of-bounds vector access leading to invalid dereference (DoS)
    26Monitor
  • CVE-2026-3273831 days apartlibheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk
    26Monitor
  • CVE-2026-4725432 days apartlibheif Has Heap Buffer Overflow in `Track::get_next_sample_raw_data()` -- OOB Chunk Vector Access
    24Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records