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Fencer Intel
high 7.7

CVE-2026-48977 json

OpenSlide: Arbitrary memory write with crafted Ventana BIF file

published 5mo ago modified last mo. also EUVD-2026-82434 , GHSA-mxg2-48g7-fmwc

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository openslide/openslide. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
7.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

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.

Patch / fix

  • openslide Debian 12 3.4.1+dfsg-6+deb12u1
  • openslide Debian 13 3.4.1+dfsg-7+deb13u1
  • openslide Debian 14 3.4.1+dfsg-9

debian advisories DEBIAN-CVE-2026-48977

  • openslide openSUSE Tumbleweed 4.0.1-1.1

opensuse advisories openSUSE-SU-2026:11707-1

Is CVE-2026-48977 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-48977 updated cvss 7.5

openslide: OpenSlide: Arbitrary code execution via crafted Ventana BIF file

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last mo.

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 7.7 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
CNA 4.0 7.7 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

Affected products

  • openslide openslide

Classification

Weakness
  • CWE-123 Write-what-where Condition
  • CWE-823 Use of Out-of-range Pointer Offset
  • CWE-1284 Improper Validation of Specified Quantity in Input

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of openslide/openslide published their own advisory on GitHub. Reviewed sources take precedence over it.