CVE-2026-47254
Medium · 6.1CVSS
6.1
EPSS
0.2%
Published
Jul 21, 2026
CISA due date
—
Cloudanix analysis
There is not enough public information yet to know what systems are affected or what an attacker could do, so teams should monitor for updates before taking targeted action.
- Exploitation
- Other
- Attacker needs
- Other
- Complexity
- Theoretical
- Impact
- Other
- Component
- Other
- Class
- Other
- Remediation
- No Fix Yet
- Effort
- Other
- Patch risk
- Other
What it actually does
Insufficient vulnerability details were provided to determine the affected component, vulnerable code path, required privileges, attack vector, or concrete technical consequence. Treat this as an uncharacterized vulnerability until vendor advisories, patches, or reliable exploit analyses identify the product and failure mode.
Why it matters to the business
Because the affected products and exploit conditions are not currently identified, business risk cannot be accurately scoped. The current EPSS value is low and the issue is not listed in CISA KEV, which suggests no broad evidence of active exploitation at this time, but organizations should continue monitoring because risk can change quickly once product details or proof-of-concept exploit information becomes available.
How an attack unfolds
No end-to-end exploitation narrative can be reliably described from the available data. An attacker would first need to identify a vulnerable product and version, determine the reachable attack surface, and then trigger the specific flaw. There is currently no provided evidence of public exploit maturity, known exploitation, ransomware use, or named threat actor activity tied to this issue.
How to fix it
No specific upgrade or configuration change can be prescribed because affected products and fixed versions were not provided. Track the assigning CNA or vendor advisory for authoritative remediation guidance, then upgrade to the first fixed version or later. Until details are available, reduce exposure by applying standard hardening: restrict unnecessary network access, require authentication where possible, disable unused features, enforce least privilege, and ensure monitoring is enabled for likely affected systems once the product is identified.
How to confirm the fix worked
Validate exposure by inventorying systems against the affected product and vulnerable version range once published. Confirm remediation by checking installed package/application versions, container image digests, appliance firmware versions, or vendor patch levels against the vendor’s fixed-version guidance. If no product match exists in the environment, document the finding as not applicable and continue monitoring for advisory updates.
Typical attack path
- Monitor public advisories, package metadata, or vendor release notes for affected product and fixed-version details.
- Identify internet-facing or internally reachable deployments of the affected product once known.
- Confirm whether target versions match the vulnerable version range.
- Attempt to reach the vulnerable functionality or code path, subject to authentication and network access requirements once known.
- Trigger the vulnerability if a working exploit becomes available.
- Use any resulting access or impact, such as service disruption, data access, privilege gain, or code execution, depending on the final vulnerability details.
How to detect it
There are no specific exploit artifacts, log strings, file paths, process names, network signatures, or affected products available from the provided information. Security teams should monitor vulnerability intelligence feeds, vendor advisories, EDR detections, web/application logs, authentication logs, crash logs, and network telemetry for updates once the affected technology is known. If later linked to a specific product, hunt for abnormal requests to that product’s exposed interfaces, unexpected child processes, new or modified files in application directories, authentication anomalies, privilege changes, crashes, and outbound connections from the application service account.
What your security team should do
- Track vendor, NVD, CNA, and security mailing-list updates for affected product, fixed versions, and exploit details.
- Do not prioritize emergency patching solely on the current data; current EPSS is low, KEV status is false, and exploit maturity is listed as none.
- Add this item to vulnerability intelligence watchlists so severity can be reassessed if affected products, proof-of-concept code, or exploitation reports emerge.
- Once product details are available, perform targeted asset inventory and version checks before assigning remediation owners.
- If the affected product is internet-facing or business-critical once identified, accelerate patch validation and deployment.
- Prepare detection logic only after concrete exploit artifacts, affected endpoints, process names, files, or log patterns are published.
The record
libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, `Track::init_sample_timing_table()` in `libheif/sequences/track.cc` stores an out-of-bounds chunk index (`m_chunks.size()`) into `m_presentation_timeline` when the number of chunks defined in the `stco` box is less than the number of samples in `stsz`. A subsequent call to `heif_track_get_next_raw_sequence_sample()` reads `m_chunks[chunk_idx]` with that OOB index, causing a heap-buffer-overflow. Version 1.22.0 fixes the issue.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Leap 16.0 | libheif | 0 | 1.23.0-160000.1.1 |
| openSUSE:Tumbleweed | libheif | 0 | 1.22.2-1.1 |
Related vulnerabilities
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- CVE-2026-48029 libheif is a HEIF and AVIF file format decoder and encoder. Also affects libheif
- CVE-2026-47709 libheif is a HEIF and AVIF file format decoder and encoder. Also affects libheif
- CVE-2026-47178 libheif is a HEIF and AVIF file format decoder and encoder. Also affects libheif
- CVE-2026-47247 libheif is a HEIF and AVIF file format decoder and encoder. Also affects libheif
- CVE-2026-47251 libheif is a HEIF and AVIF file format decoder and encoder. Also affects libheif
- CVE-2026-47714 libheif is a HEIF and AVIF file format decoder and encoder. Also affects libheif
- CVE-2026-49271 libheif is a HEIF and AVIF file format decoder and encoder. Also affects libheif