How severe is CVE-2026-40386?

CVE-2026-40386 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2026-40386 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40386?

CVE-2026-40386 affects Libexif Project Libexif. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40386?

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

Does CVE-2026-40386 have an EU (EUVD) identifier?

Yes. CVE-2026-40386 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21734.

When was CVE-2026-40386 published?

CVE-2026-40386 was published on 2026-04-12 and last updated on 2026-06-17.

CVE-2026-40386

CVE-2026-40386 is a medium-severity vulnerability in Libexif Project Libexif with a CVSS 3.x base score of 4.0. 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-191.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21734
Weakness: CWE-191
Affected product: Libexif Project Libexif
Published: 2026-04-12
Last modified: 2026-06-17

Description

In libexif through 0.6.25, an integer underflow in size checking for Fuji and Olympus MakerNote decoding could be used by attackers to crash or leak information out of libexif-using programs.

Frequently asked questions

What is CVE-2026-40386?: In libexif through 0.6.25, an integer underflow in size checking for Fuji and Olympus MakerNote decoding could be used by attackers to crash or leak information out of libexif-using programs.
How severe is CVE-2026-40386?: CVE-2026-40386 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2026-40386 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40386?: CVE-2026-40386 affects Libexif Project Libexif. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40386?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40386 have an EU (EUVD) identifier?: Yes. CVE-2026-40386 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21734.
When was CVE-2026-40386 published?: CVE-2026-40386 was published on 2026-04-12 and last updated on 2026-06-17.

References

https://github.com/libexif/libexif/commit/dc6eac6e9655d14d0779d99e82d0f5f442d2f34b

Affected products (1)

cpe:2.3:a:libexif_project:libexif:*:*:*:*:*:*:*:*

More vulnerabilities in Libexif Project Libexif

CVE-2020-13112 — Critical (CVSS 9.1): An issue was discovered in libexif before 0.6.22. Several buffer over-reads in EXIF MakerNote handling could lead to…
CVE-2017-7544 — Critical (CVSS 9.1): libexif through 0.6.21 is vulnerable to out-of-bounds heap read vulnerability in exif_data_save_data_entry function in…
CVE-2020-13113 — High (CVSS 8.2): An issue was discovered in libexif before 0.6.22. Use of uninitialized memory in EXIF Makernote handling could lead to…
CVE-2016-6328 — High (CVSS 8.1): A vulnerability was found in libexif. An integer overflow when parsing the MNOTE entry data of the input file. This can…
CVE-2020-0198 — High (CVSS 7.5): In exif_data_load_data_content of exif-data.c, there is a possible UBSAN abort due to an integer overflow. This could…
CVE-2020-0181 — High (CVSS 7.5): In exif_data_load_data_thumbnail of exif-data.c, there is a possible denial of service due to an integer overflow. This…

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