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NVD / CVE Program· CNA GitHub_M

CVE-2026-47251: libheif has an incomplete fix for CVE-2026-3949: integer overflow bypass in vvdec_push_data2

Noroxi assessment

Priority: Monitor (action score 27/100)

  • 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: 0.15% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: libheif (openSUSE:Leap 16.0) 1.23.0-160000.1.1; libheif (openSUSE:Tumbleweed) 1.22.2-1.1; libheif (SUSE:Linux Enterprise Module for Desktop Applications 15 SP7) 1.23.0-150700.3.15.1.

Low priority for now. Upgrade to libheif (openSUSE:Leap 16.0) 1.23.0-160000.1.1; libheif (openSUSE:Tumbleweed) 1.22.2-1.1; libheif (SUSE:Linux Enterprise Module for Desktop Applications 15 SP7) 1.23.0-150700.3.15.1 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. The fix for CVE-2026-3949 (commit `b97c8b5`, PR #1712) introduced an integer overflow in the very security check it added. The check itself can be bypassed, allowing a crafted HEIF file with a VVC track to trigger the same out-of-bounds heap read that CVE-2026-3949 was meant to prevent. This is a separate, currently-unpatched vulnerability. Issue #1712 was closed as fixed without testing the edge case where `size` is near `UINT32_MAX`. Version 1.22.0 patches the issue.

MediumCVSS 6.8 · v4.0—No exploit Fix available
Published
Jul 21, 2026
Updated
Oct 24, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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
6.8
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

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.

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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 1.22.0

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

    • < 1.22.0affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
openSUSE:Leap 16.0libheifbefore 1.23.0-160000.1.11.23.0-160000.1.1
openSUSE:Tumbleweedlibheifbefore 1.22.2-1.11.22.2-1.1
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-2026-47178Jul 21, 2026 · libheif has Heap Out Of Bounds Write in unci subsystem
    31Monitor
  • ← EarlierCVE-2026-47247Jul 21, 2026 · libheif Vulnerable to Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel Plane Allocation
    30Monitor
  • Later →CVE-2026-47254Jul 21, 2026 · libheif Has Heap Buffer Overflow in `Track::get_next_sample_raw_data()` -- OOB Chunk Vector Access
    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
opensuse:libheif1.22.2-1.1 · 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-2026-480291 days apartlibheif: heap OOB read in ImageItem_Grid::decode_grid_tile via irot-induced tile-coordinate underflow
    28Monitor
  • CVE-2025-68431204 days apartlibheif has Potential Heap Buffer Over-Read
    28Monitor
  • CVE-2026-4927132 days apartlibheif: Wrapped icef compressed-unit range check causes out-of-bounds read in uncompressed HEIF decoder
    26Monitor
  • CVE-2026-4106960 days apartlibheif allows Out-of-bounds vector access leading to invalid dereference (DoS)
    26Monitor
  • CVE-2026-3273863 days apartlibheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk
    26Monitor
  • CVE-2026-472540 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

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
A
Scope
X

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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✗ → ✓

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References

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

All records