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CVE-2026-84451· NVD / CVE Program· CNA GitHub_M

libheif: Incomplete fix for CVE-2026-62292 leaves libheif vulnerable to an out-of-bounds read

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.3, the no-icef full-item branch of unc_decoder::get_compressed_image_data_uncompressed() in libheif/codecs/uncompressed/unc_decoder.cc retains an addition-based range check that can wrap when a crafted uncompressed tile grid produces a large range_start_offset and range_size. The overflow makes the bounds comparison pass and allows heif_image_handle_decode_image_tile() to call memcpy() with an invalid source pointer and a very large length when decoding a valid high-index advertised tile. This incomplete remediation of CVE-2026-62292 can reliably crash tile-processing applications, while whole-image decoding is not claimed to reach the demonstrated path. This issue is fixed in version 1.23.3.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Sep 18, 2026
Updated
Sep 24, 2026
EPSS
0.3% · 21th percentile
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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
none
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.

Affected systems

—

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

    • >= 1.19.0, < 1.23.3affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12libheifall versions—
Debian:13libheifbefore 1.23.4-1~deb13u11.23.4-1~deb13u1
Debian:14libheifbefore 1.23.3-11.23.3-1
openSUSE:Leap 16.0libheifbefore 1.23.4-160000.1.11.23.4-160000.1.1
openSUSE:Tumbleweedlibheifbefore 1.23.4-1.11.23.4-1.1
SUSE:Linux Enterprise Module for Desktop Applications 15 SP7libheifbefore 1.23.4-150700.3.21.11.23.4-150700.3.21.1

Same product

strukturag: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-84383libheif: Heap buffer overflow in `scale_nearest_neighbor()` via duplicate Alpha planes from nested `iden`/`auxl` items
    39Monitor
  • CVE-2026-62292libheif: Out-of-bounds read in uncompressed unci tile range slicing
    34Monitor
  • CVE-2026-84447libheif: Derived-image indirect reference chains and tiled offsets bypass decode caching and MemoryHandle limits, causing CPU/memory amplification DoS
    30Monitor
  • CVE-2026-84446libheif: Sequence decode timing-table initialization allows non-terminating loops and unbounded memory, bypassing max_sequence_frames
    30Monitor
  • CVE-2026-84384libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoS
    30Monitor
  • CVE-2026-50142libheif: unbounded heap allocation in HEIF sequence parser (stsz fixed-size mode missing bound check)
    30Monitor

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
strukturag libheif1.23.3 · descriptionVendor (CNA)
debian:libheif1.23.4-1~deb13u1 · Debian:13Package registry (OSV)
opensuse:libheif1.23.4-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:libheif1.23.4-150700.3.21.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP7Package 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.

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-2026-6229231 days apartlibheif: Out-of-bounds read in uncompressed unci tile range slicing
    34Monitor
  • CVE-2026-32882122 days apartlibheif: Heap Buffer OOB Read in overlay compositing due to wrong alpha stride
    28Monitor
  • CVE-2026-6229131 days apartlibheif: Heap out of bounds write in libheif uncompressed encoder when writing images with mismatched auxiliary alpha dimensions
    21Monitor
  • CVE-2026-844480 days apartlibheif: Heap out-of-bounds read in libheif inline-mask region API (heif_region_item_add_region_inline_mask_data / heif_region_get_mask_image)
    16Monitor
  • CVE-2026-844490 days apartlibheif hOp_RGB24_32_to_YCbCr Memory Access Error / SEGV
    14Monitor

Chain candidates

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

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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

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Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓

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References

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

All records