Integer underflow in libexif
Priority LOW 30CWE-191Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · High
- Fix status
- Partial Red Hat: 20 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0014 3rd percentileScored 2026-11-07
Fix Partial Red Hat: 11 advisoriesRed Hat: 20 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| libexif project | libexif | up to 0.6.25 | — | No fix listed | CNA |
- libexif Vendorlibexif project Affected up to 0.6.25 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libexif_project:libexif:*:*:*:*:*:*:*:* | up to 0.6.25 | Vulnerable | libexif project |
- cpe:2.3:a:libexif_project:libexif:*:*:*:*:*:*:*:* Versions up to 0.6.25 Vulnerable ·libexif project
Remediation
Red Hat 11 advisories
- RHSA-2026:26567 Released 2026-06-17 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux Server (v. 7 ELS) libexif-0.6.22-3.el7_9, libexif-0.6.22-3.el7_9.ppc
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) libexif-devel-0.6.22-3.el7_9, libexif-devel-0.6.22-3.el7_9.ppc, libexif-doc-0.6.22-3.el7_9
- RHSA-2026:26292 Released 2026-06-16 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) libexif-0.6.22-5.el8_4.1
- Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) libexif-0.6.22-5.el8_4.1
- RHSA-2026:26276 Released 2026-06-16 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) libexif-0.6.22-6.el9_2.1
Show 8 more Red Hat advisories
- RHSA-2026:26274 Released 2026-06-16 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) libexif-0.6.24-9.el10_0.1
- Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libexif-devel-0.6.24-9.el10_0.1, libexif-doc-0.6.24-9.el10_0.1
- RHSA-2026:26224 Released 2026-06-16 · Red Hat rating Moderatelibexif security update
- Red Hat CodeReady Linux Builder EUS (v.9.6) libexif-devel-0.6.22-6.el9_6.1
- Red Hat Enterprise Linux AppStream EUS (v.9.6) libexif-0.6.22-6.el9_6.1
- RHSA-2026:26192 Released 2026-06-16 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux AppStream E4S (v.9.4) libexif-0.6.22-6.el9_4.1
- RHSA-2026:26190 Released 2026-06-16 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux AppStream E4S (v.8.8) libexif-0.6.22-5.el8_8.1
- Red Hat Enterprise Linux AppStream TUS (v.8.8) libexif-0.6.22-5.el8_8.1
- RHSA-2026:26191 Released 2026-06-16 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux AppStream AUS (v.8.6) libexif-0.6.22-5.el8_6.1
- Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) libexif-0.6.22-5.el8_6.1
- RHSA-2026:22553 Released 2026-06-03 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux AppStream (v. 9) libexif-0.6.22-6.el9_8.1
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libexif-devel-0.6.22-6.el9_8.1
- RHSA-2026:22529 Released 2026-06-03 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux AppStream (v. 10) libexif-0.6.24-9.el10_2.1
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libexif-devel-0.6.24-9.el10_2.1, libexif-doc-0.6.24-9.el10_2.1
- RHSA-2026:20929 Released 2026-05-26 · Red Hat rating Moderatelibexif security update
- Red Hat Enterprise Linux AppStream (v. 8) libexif-0.6.22-6.el8_10
- Red Hat Enterprise Linux CRB (v. 8) libexif-devel-0.6.22-6.el8_10
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat CodeReady Linux Builder EUS (v.9.6) | Fixed | RHSA-2026:26224 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:22529 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2026:20929 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:22553 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2026:26292 |
| Red Hat Enterprise Linux AppStream AUS (v.8.6) | Fixed | RHSA-2026:26191 |
| Red Hat Enterprise Linux AppStream E4S (v.8.8) | Fixed | RHSA-2026:26190 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:26276 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:26192 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:26274 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:26224 |
| Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:26292 |
| Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) | Fixed | RHSA-2026:26191 |
| Red Hat Enterprise Linux AppStream TUS (v.8.8) | Fixed | RHSA-2026:26190 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:20929 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:22529 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:22553 |
| Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Fixed | RHSA-2026:26274 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2026:26567 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2026:26567 |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-40386
- 2026-10-03 Alias added: GHSA-p6wp-hhx9-7jj5
More libexif project Libexif vulnerabilities
- TI-2026-25264 Integer underflow in libexif CVSS 3.1HIGH 7.8
- TI-2017-05185 Out-of-bounds read in Red Hat libexif CVSS 3.0CRITICAL 9.1
- TI-2020-10306 An issue was discovered in libexif before 0.6.22. CVSS 3.1CRITICAL 9.1
- TI-2012-02433 Buffer overflow in the exif_entry_format_value function in exif-entry.c in the EXIF Tag… CVSS 2.0HIGH 7.5
- TI-2012-02457 Integer underflow in the exif_entry_get_value function in exif-entry.c in the EXIF Tag… CVSS 2.0HIGH 7.5
- TI-2012-02456 Off-by-one error in the exif_convert_utf16_to_utf8 function in exif-entry.c in the EXIF… CVSS 2.0HIGH 7.5
Sources
- CVE-2026-40386 · CVE Program
- CVE-2026-40386 · NVD
- FIRST EPSS
- GHSA-p6wp-hhx9-7jj5 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-40386 · Red Hat security data · CC BY 4.0
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