CVE-2026-48977

HIGH

7.7

CVSS v4

Description

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.

CWE-123 CWE-823 CWE-1284

How to fix

Remediation Available

openslideDebian

Fixed in:3.4.1+dfsg-6+deb12u1CVE-2026-48977

Fixed in:3.4.1+dfsg-7+deb13u1CVE-2026-48977

Fixed in:3.4.1+dfsg-9CVE-2026-48977

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v4 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

Impact

CVSS: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

Exploit Intelligence

0.48%probability of exploitation in 30 days

39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Other references4

Related Vulnerabilities

Other CWE-123 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-8271	Critical	9.8	5.9%	-	Fix
CVE-2017-10994	High	7.3	4.9%	-	-
CVE-2025-55298	High	7.5	4.5%	-	Fix
CVE-2014-5435	Critical	9.8	3.5%	-	Fix
CVE-2024-42479	Critical	10.0	2.6%	-	Fix
CVE-2026-43284	High	7.8	2.5%	-	Fix

Common questions

How do I fix CVE-2026-48977?

Upgrade openslide on debian 12 to 3.4.1+dfsg-6+deb12u1 or later.

Is CVE-2026-48977 being actively exploited?

Not that we know of. CVE-2026-48977 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.48% is the estimated probability that it will be exploited in the next 30 days. That is higher than 39% of all scored CVEs.

How severe is CVE-2026-48977?

CVE-2026-48977 has a CVSS v4 base score of 7.7, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-48977 affect?

Published advisories record a fix for openslide (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-23.