CVE catalog

CVE-2026-5438

A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits on decompressed size and allocates memory based on

[CVE catalog]

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Apr 9, 2026, 3:16:15 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.48% · Oct 25, 2026

A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits on decompressed size and allocates memory based on attacker-controlled compression metadata. A specially crafted gzip payload can trigger excessive memory allocation and exhaust system memory.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	orthanc	sid	`1.13.0+dfsg-1`	fixed
Debian	orthanc	forky	`1.13.0+dfsg-1`	fixed
Debian	orthanc	trixie	`1.12.7+dfsg-4`	vulnerable
Debian	orthanc	bookworm	`1.10.1+dfsg-2+deb12u1`	vulnerable
Debian	orthanc	bookworm-security	`1.10.1+dfsg-2+deb12u1`	vulnerable
Cpe	orthanc	Not reported	Not reported	vulnerable
Cpe	orthanc	Not reported	`1.12.11`	fixed
Cpe	orthanc	Not reported	`1.12.11`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	orthanc	source	sid	`1.12.10+dfsg-4`	not yet assigned	Not reported	[1133182]
Debian	orthanc	source	forky	`1.12.10+dfsg-4`	not yet assigned	Not reported	[1133182]
Debian	orthanc	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1133182]
Debian	orthanc	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1133182]
Cpe	orthanc	cpe	Not reported	`1.12.11`	Not reported	Not reported	Not reported
Cpe	orthanc	cpe	Not reported	`1.12.11`	Not reported	NVD-CVE-2026-5438	Not reported

[Debian bug #1133182]

Notes

[trixie] orthanc: Minor issue [bookworm] orthanc: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[liborthancframework1]Affected
Source package: [orthanc]
Details (4)
- 1.10.1+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
[liborthancframework-dev]Affected
Source package: [orthanc]
Details (4)
- 1.10.1+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
[orthanc]Affected
Details (4)
- 1.10.1+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
[orthanc-dev]Affected
Source package: [orthanc]
Details (4)
- 1.10.1+dfsg-2+deb12u1 · amd64 · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · arm64 · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
[orthanc-doc]Affected
Source package: [orthanc]
Details (4)
- 1.10.1+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · all · bookworm
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12
- 1.10.1+dfsg-2+deb12u1 · all · bookworm-security
  Affected
  nvd · orthanc · debian · bookworm; nvd · orthanc · debian · 12

[Debian 13 (Trixie)]

[liborthancframework1]Affected
Source package: [orthanc]
Details (2)
- 1.12.7+dfsg-4 · amd64 · trixie
  Affected
  nvd · orthanc · debian · 13
- 1.12.7+dfsg-4 · arm64 · trixie
  Affected
  nvd · orthanc · debian · 13
[liborthancframework-dev]Affected
Source package: [orthanc]
Details (2)
- 1.12.7+dfsg-4 · amd64 · trixie
  Affected
  nvd · orthanc · debian · 13
- 1.12.7+dfsg-4 · arm64 · trixie
  Affected
  nvd · orthanc · debian · 13
[orthanc]Affected
Details (2)
- 1.12.7+dfsg-4 · amd64 · trixie
  Affected
  nvd · orthanc · debian · 13
- 1.12.7+dfsg-4 · arm64 · trixie
  Affected
  nvd · orthanc · debian · 13
[orthanc-dev]Affected
Source package: [orthanc]
Details (2)
- 1.12.7+dfsg-4 · amd64 · trixie
  Affected
  nvd · orthanc · debian · 13
- 1.12.7+dfsg-4 · arm64 · trixie
  Affected
  nvd · orthanc · debian · 13
[orthanc-doc]Affected
Source package: [orthanc]
Details (2)
- 1.12.7+dfsg-4 · all · trixie
  Affected
  nvd · orthanc · debian · 13
- 1.12.7+dfsg-4 · all · trixie
  Affected
  nvd · orthanc · debian · 13

Observed: Oct 26, 2026, 2:51:50 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]