How severe is CVE-2025-68431?

CVE-2025-68431 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-68431 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-68431?

CVE-2025-68431 affects Struktur Libheif. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-68431?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-68431 have an EU (EUVD) identifier?

Yes. CVE-2025-68431 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205646.

When was CVE-2025-68431 published?

CVE-2025-68431 was published on 2025-12-29 and last updated on 2026-06-17.

CVE-2025-68431

CVE-2025-68431 is a medium-severity vulnerability in Struktur Libheif with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205646
Weakness: CWE-125
Affected product: Struktur Libheif
Published: 2025-12-29
Last modified: 2026-06-17

Description

libheif is an HEIF and AVIF file format decoder and encoder. Prior to version 1.21.0, a crafted HEIF that exercises the overlay image item path triggers a heap buffer over-read in `HeifPixelImage::overlay()`. The function computes a negative row length (likely from an unclipped overlay rectangle or invalid offsets), which then underflows when converted to `size_t` and is passed to `memcpy`, causing a very large read past the end of the source plane and a crash. Version 1.21.0 contains a patch. As a workaround, avoid decoding images using `iovl` overlay boxes.

Frequently asked questions

What is CVE-2025-68431?: libheif is an HEIF and AVIF file format decoder and encoder. Prior to version 1.21.0, a crafted HEIF that exercises the overlay image item path triggers a heap buffer over-read in `HeifPixelImage::overlay()`. The function computes a negative row length (likely from an unclipped overlay rectangle or invalid offsets), which then underflows when converted to `size_t` and is passed to `memcpy`, causing a very large read past the end of the source plane and a crash. Version 1.21.0 contains a patch. As a workaround, avoid decoding images using `iovl` overlay boxes.
How severe is CVE-2025-68431?: CVE-2025-68431 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-68431 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-68431?: CVE-2025-68431 affects Struktur Libheif. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-68431?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-68431 have an EU (EUVD) identifier?: Yes. CVE-2025-68431 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205646.
When was CVE-2025-68431 published?: CVE-2025-68431 was published on 2025-12-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*

More vulnerabilities in Struktur Libheif

CVE-2026-32740 — High (CVSS 8.8): libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow…
CVE-2023-49464 — High (CVSS 8.8): libheif v1.17.5 was discovered to contain a segmentation violation via the function…
CVE-2023-49463 — High (CVSS 8.8): libheif v1.17.5 was discovered to contain a segmentation violation via the function find_exif_tag at /libheif/exif.cc.
CVE-2023-49462 — High (CVSS 8.8): libheif v1.17.5 was discovered to contain a segmentation violation via the component /libheif/exif.cc.
CVE-2023-49460 — High (CVSS 8.8): libheif v1.17.5 was discovered to contain a segmentation violation via the function…
CVE-2020-19499 — High (CVSS 8.8): An issue was discovered in heif::Box_iref::get_references in libheif 1.4.0, allows attackers to cause a Denial of…

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