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CVE-2026-5444

Heap Buffer Overflow in PAM Image Buffer Allocation

7.1 HighFix available

A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
High

Exploit likelihood

0.17%Up 0.1 points since Apr 10, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.1

Heap Buffer Overflow in PAM Image Buffer Allocation

A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.

Record
CVE-2026-5444
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Updated
2026-11-02
EUVDEUVD-2026-20924 7.1

A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.

Record
EUVD-2026-20924
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-fpm7-vpjm-5gg2 7.1

A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc...

A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.

Record
GHSA-fpm7-vpjm-5gg2
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
NVD 7.1

A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.

Record
CVE-2026-5444
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
OSVDEBIAN-CVE-2026-5444 7.1

A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.

Record
DEBIAN-CVE-2026-5444
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-5444 7.1

A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.

Record
UBUNTU-CVE-2026-5444
CVSS 3.1
7.1 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
orthanc
Debian:12
All versions, plus listed versions
1.10.1+dfsg-21.10.1+dfsg-2+deb12u11.12.1+dfsg-11.12.1+dfsg-21.12.1+dfsg-3
Show 31 moreShow less
1.12.1+dfsg-41.12.10+dfsg-11.12.10+dfsg-21.12.10+dfsg-31.12.10+dfsg-41.12.10+dfsg-51.12.11+dfsg-11.12.11+dfsg-21.12.11+dfsg-31.12.11+dfsg-41.12.11+dfsg-51.12.11+dfsg-61.12.11+dfsg-71.12.11+dfsg-81.12.2+dfsg-11.12.3+dfsg-11.12.3+dfsg-21.12.4+dfsg-11.12.4+dfsg-21.12.4+dfsg-31.12.4+dfsg-41.12.5+dfsg-11.12.5+dfsg-21.12.6+dfsg-11.12.7+dfsg-11.12.7+dfsg-21.12.7+dfsg-31.12.7+dfsg-41.12.9+dfsg-11.12.9+dfsg-21.13.0+dfsg-1
None known
orthanc
Debian:13
All versions, plus listed versions
1.12.10+dfsg-11.12.10+dfsg-21.12.10+dfsg-31.12.10+dfsg-41.12.10+dfsg-5
Show 12 moreShow less
1.12.11+dfsg-11.12.11+dfsg-21.12.11+dfsg-31.12.11+dfsg-41.12.11+dfsg-51.12.11+dfsg-61.12.11+dfsg-71.12.11+dfsg-81.12.7+dfsg-41.12.9+dfsg-11.12.9+dfsg-21.13.0+dfsg-1
None known
orthanc
Debian:14
before 1.12.10+dfsg-4, plus listed versions
1.12.10+dfsg-11.12.10+dfsg-21.12.10+dfsg-31.12.7+dfsg-41.12.9+dfsg-11.12.9+dfsg-2
1.12.10+dfsg-4
orthanc
Ubuntu:16.04:LTS
All versions, plus listed versions
0.9.4+dfsg-10.9.4+dfsg-20.9.5+dfsg-11.0.0+dfsg-11.0.0+dfsg-1build1
None known
orthanc
Ubuntu:18.04:LTS
All versions, plus listed versions
1.3.0+dfsg-1build11.3.0+dfsg-1build21.3.1+dfsg-11.3.1+dfsg-1build11.3.1+dfsg-1build2
None known
orthanc
Ubuntu:20.04:LTS
All versions, plus listed versions
1.5.7+dfsg-21.5.8+dfsg-21.5.8+dfsg-2ubuntu21.5.8+dfsg-2ubuntu31.5.8+dfsg-2ubuntu41.5.8+dfsg-2ubuntu51.5.8+dfsg-2ubuntu6
None known
orthanc
Ubuntu:22.04:LTS
All versions, plus listed versions
1.9.2+really1.9.1+dfsg-11.9.7+dfsg-3ubuntu11.9.7+dfsg-3ubuntu21.9.7+dfsg-41.9.7+dfsg-51.9.7+dfsg-61.10.0+dfsg-1
None known
orthanc
Ubuntu:24.04:LTS
All versions, plus listed versions
1.12.1+dfsg-31.12.1+dfsg-41.12.1+dfsg-4build11.12.2+dfsg-11.12.2+dfsg-1build31.12.2+dfsg-1build4
None known
orthanc
Ubuntu:25.10
All versions, plus listed versions
1.12.6+dfsg-11.12.7+dfsg-41.12.7+dfsg-4build2
None known
orthanc
Ubuntu:26.10
All versions, plus listed versions
1.12.10+dfsg-21.12.11+dfsg-81.12.11+dfsg-8build1
None known
orthanc
Ubuntu:26.04:LTS
All versions, plus listed versions
1.12.7+dfsg-4build21.12.9+dfsg-21.12.10+dfsg-11.12.10+dfsg-1build11.12.10+dfsg-2
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-5444 is a high vulnerability (CVSS 7.1) in Orthanc-server Orthanc, published April 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 5th percentile. Fixed in orthanc 1.12.10+dfsg-4.

References

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