Quick answers
- Is CVE-2026-48977 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-48977 being exploited in the wild.
- How severe is CVE-2026-48977?
- Informational severity, with a CVSS score of 8.1, published 17 September 2026.
- Which products and versions are affected?
- OpenSlide 3.4.1 through 4.0.0.
- Is there a fix for CVE-2026-48977?
- A patch was published on 2026-06-06: Fixed in version 4.0.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-48977 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-48977?
- Check whether you run OpenSlide at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
OpenSlide's parse_level0_xml() function in src/openslide-vendor-ventana.c fails to validate tile row and column counts from Ventana BIF files. An attacker can supply nonpositive (zero or negative) tile counts in a malicious BIF file, which are then used to compute relative memory offsets without bounds checking. This allows writing arbitrary values at attacker-controlled memory locations. The vulnerability affects all OpenSlide versions from 3.4.1 through 4.0.0 and is fixed in version 4.0.1. No authentication or user interaction is required beyond opening a malicious image file.
Affected products
- OpenSlide OpenSlide 3.4.1 through 4.0.0
Timeline
- 2026-09-17: disclosed
- 2026-06-06: patched: Fixed in version 4.0.1