libheif has a heap buffer overflow in decode_mask_image()
libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and below contain a heap buffer overflow in MaskImageCodec::decode_mask_image(). When decoding a HEIF file containing a mask image (mski), the function copies the full iloc extent data into a pixel buffer using memcpy(dst, data.data(), data.size()). The copy length data.size() is determined by the iloc extent in the file (attacker-controlled), while the destination buffer is sized based on the declared image dimensions. Because no upper-bound check exists on the data length, a crafted file whose iloc extent exceeds the pixel buffer allocation overflows the heap. The vulnerable single-memcpy branch is reached when the mskC property specifies bits_per_pixel = 8 and the ispe property declares an even width ≥ 64 (so that stride == width), with no changes to default security limits or external codec plugins required. This issue has been fixed in version 1.22.0.
- Published
- May 19, 2026
- Updated
- Jul 24, 2026
- EPSS
- 0.4% · 37th percentile
- CWE
- CWE-122
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Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
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
- 7.1
- 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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| enterprise linux | 10 | cpe:2.3:redhat:enterprise_linux:10 |
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.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | libheif | all versions | — |
| Debian:13 | libheif | before 1.19.8-1+deb13u1 | 1.19.8-1+deb13u1 |
| Debian:14 | libheif | before 1.23.1-1 | 1.23.1-1 |
| openSUSE:Leap 16.0 | libheif | before 1.23.0-160000.1.1 | 1.23.0-160000.1.1 |
| openSUSE:Tumbleweed | libheif | before 1.22.2-1.1 | 1.22.2-1.1 |
| SUSE:Linux Enterprise Module for Desktop Applications 15 SP7 | libheif | before 1.23.0-150700.3.15.1 | 1.23.0-150700.3.15.1 |
| SUSE:Linux Enterprise Server 16.0 | libheif | before 1.23.0-160000.1.1 | 1.23.0-160000.1.1 |
Same product
strukturag: all recordsOther 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` items39Monitor
- CVE-2026-62292libheif: Out-of-bounds read in uncompressed unci tile range slicing34Monitor
- CVE-2026-84447libheif: Derived-image indirect reference chains and tiled offsets bypass decode caching and MemoryHandle limits, causing CPU/memory amplification DoS30Monitor
- CVE-2026-84446libheif: Sequence decode timing-table initialization allows non-terminating loops and unbounded memory, bypassing max_sequence_frames30Monitor
- CVE-2026-84384libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoS30Monitor
- 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 / package | Fixed version | Source |
|---|---|---|
| strukturag libheif | 1.22.0 · description | Vendor (CNA) |
| debian:libheif | 1.19.8-1+deb13u1 · Debian:13 | Package registry (OSV) |
| opensuse:libheif | 1.22.2-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:libheif | 1.23.0-160000.1.1 · SUSE:Linux Enterprise Server 16.0 | Package 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.
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 researchersFinders, 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.
No nightly-computed relations.
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
- low · data or configuration can be modified
- 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
- Low
- Availability impact
- High
Weakness class (CWE)
CWE-122 · Heap-based Buffer OverflowCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/strukturag/libheif/releases/tag/v1.22.0
- github.com/strukturag/libheif/security/advisories/GHSA-j3w5-7whq-p37q
- access.redhat.com/security/cve/CVE-2026-32741
- bugzilla.redhat.com/show_bug.cgi?id=2480002
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32741.json
Vendor advisories and official records. Exploit/PoC links are deliberately left out.