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CVE-2026-48977

OpenSlide: Arbitrary memory write with crafted Ventana BIF file

7.7 HighFix available

OpenSlide is a C library for reading whole slide image files. From 3.4.1 until 4.0.1, OpenSlide's parse_level0_xml() processing in src/openslide-vendor-ventana.c accepts nonpositive row or column tile counts from a crafted Ventana BIF file. The invalid counts produce attacker-controlled relative memory offsets and allow arbitrary values to be written at those offsets, affecting all supported platforms and configurations and resulting in a crash or potential arbitrary code execution. This issue is fixed in version 4.0.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.48%Up 0.2 points since Sep 18, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.7

OpenSlide: Arbitrary memory write with crafted Ventana BIF file

OpenSlide is a C library for reading whole slide image files. From 3.4.1 until 4.0.1, OpenSlide's parse_level0_xml() processing in src/openslide-vendor-ventana.c accepts nonpositive row or column tile counts from a crafted Ventana BIF file. The invalid counts produce attacker-controlled relative memory offsets and allow arbitrary values to be written at those offsets, affecting all supported platforms and configurations and resulting in a crash or potential arbitrary code execution. This issue is fixed in version 4.0.1.

Record
CVE-2026-48977
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-123, CWE-823, CWE-1284
Updated
2026-11-02
EUVDEUVD-2026-82434 7.7

OpenSlide is a C library for reading whole slide image files. From 3.4.1 until 4.0.1, OpenSlide's parse_level0_xml() processing in src/openslide-vendor-ventana.c accepts nonpositive row or column tile counts from a crafted Ventana BIF file. The invalid counts produce attacker-controlled relative memory offsets and allow arbitrary values to be written at those offsets, affecting all supported platforms and configurations and resulting in a crash or potential arbitrary code execution. This issue is fixed in version 4.0.1.

Record
EUVD-2026-82434
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 7.7

OpenSlide is a C library for reading whole slide image files. From 3.4.1 until 4.0.1, OpenSlide's parse_level0_xml() processing in src/openslide-vendor-ventana.c accepts nonpositive row or column tile counts from a crafted Ventana BIF file. The invalid counts produce attacker-controlled relative memory offsets and allow arbitrary values to be written at those offsets, affecting all supported platforms and configurations and resulting in a crash or potential arbitrary code execution. This issue is fixed in version 4.0.1.

Record
CVE-2026-48977
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-123, CWE-823, CWE-1284
Updated
2026-11-02
OSV 7.7

OpenSlide: Arbitrary memory write with crafted Ventana BIF file

OpenSlide is a C library for reading whole slide image files. From 3.4.1 until 4.0.1, OpenSlide's parse_level0_xml() processing in src/openslide-vendor-ventana.c accepts nonpositive row or column tile counts from a crafted Ventana BIF file. The invalid counts produce attacker-controlled relative memory offsets and allow arbitrary values to be written at those offsets, affecting all supported platforms and configurations and resulting in a crash or potential arbitrary code execution. This issue is fixed in version 4.0.1.

Record
CVE-2026-48977
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-123, CWE-1284, CWE-823
Updated
2026-11-02
OSVDEBIAN-CVE-2026-48977 7.7

OpenSlide is a C library for reading whole slide image files. From 3.4.1 until 4.0.1, OpenSlide's parse_level0_xml() processing in src/openslide-vendor-ventana.c accepts nonpositive row or column tile counts from a crafted Ventana BIF file. The invalid counts produce attacker-controlled relative memory offsets and allow arbitrary values to be written at those offsets, affecting all supported platforms and configurations and resulting in a crash or potential arbitrary code execution. This issue is fixed in version 4.0.1.

Record
DEBIAN-CVE-2026-48977
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-48977 7.7

OpenSlide is a C library for reading whole slide image files. From 3.4.1 until 4.0.1, OpenSlide's parse_level0_xml() processing in src/openslide-vendor-ventana.c accepts nonpositive row or column tile counts from a crafted Ventana BIF file. The invalid counts produce attacker-controlled relative memory offsets and allow arbitrary values to be written at those offsets, affecting all supported platforms and configurations and resulting in a crash or potential arbitrary code execution. This issue is fixed in version 4.0.1.

Record
UBUNTU-CVE-2026-48977
CVSS 4.0
7.7 HighCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
OSVMGASA-2026-0328 No score

Updated openslide packages fix a security vulnerability

Arbitrary memory write with crafted Ventana BIF file. (CVE-2026-48977)

Record
MGASA-2026-0328
Updated
2026-11-02
OSVopenSUSE-SU-2026:11707-1 No score

libopenslide-devel-4.0.1-1.1 on GA media

These are all security issues fixed in the libopenslide-devel-4.0.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11707-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
openslide
Debian:12
 before 3.4.1+dfsg-6+deb12u1, plus listed versions
3.4.1+dfsg-6
3.4.1+dfsg-6+deb12u1
openslide
Debian:13
 before 3.4.1+dfsg-7+deb13u1, plus listed versions
3.4.1+dfsg-7
3.4.1+dfsg-7+deb13u1
openslide
Debian:14
 before 3.4.1+dfsg-9, plus listed versions
3.4.1+dfsg-73.4.1+dfsg-8
3.4.1+dfsg-9
openslide
Mageia:10
 before 4.0.0-1.1.mga10
4.0.0-1.1.mga10
openslide
Ubuntu:16.04:LTS
 All versions, plus listed versions
3.4.0-1build1
 None known
openslide
Ubuntu:18.04:LTS
 All versions, plus listed versions
3.4.1+dfsg-2
 None known
openslide
Ubuntu:20.04:LTS
 All versions, plus listed versions
3.4.1+dfsg-4
 None known
openslide
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.4.1+dfsg-53.4.1+dfsg-5build1
 None known
openslide
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.4.1+dfsg-6build13.4.1+dfsg-73.4.1+dfsg-7build13.4.1+dfsg-7build2
 None known
openslide
Ubuntu:25.10
 All versions, plus listed versions
3.4.1+dfsg-7build23.4.1+dfsg-7build3
 None known
openslide
Ubuntu:26.10
 All versions, plus listed versions
3.4.1+dfsg-7build43.4.1+dfsg-9
 None known
openslide
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.4.1+dfsg-7build33.4.1+dfsg-7build4
 None known
openslide
openSUSE:Tumbleweed
 before 4.0.1-1.1
4.0.1-1.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

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

In short

CVE-2026-48977 is a high vulnerability (CVSS 7.7) in Openslide, published August 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. Fixed in openslide 3.4.1+dfsg-6+deb12u1.

References

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