CVE-2026-48977

HIGHPre-NVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 78% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.7
EG Score
7.7(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity77% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

September 17, 2026

Last Modified

September 18, 2026

Advisory Details (4)

Auto-updated Sep 17, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

OpenSlide 4.0.1

Patch available: openslide/openslide v4.0.1

https://github.com/openslide/openslide/releases/tag/v4.0.1
github_commit Patch Available

commit 2be88bd782d9 (openslide/openslide)

Patch available: openslide/openslide v4.0.1 (contains commit 2be88bd782d9)

https://github.com/openslide/openslide/commit/2be88bd782d9fff46de8e56a99baca523e7917b3
github_pr Patch Available

ventana: fail if area has invalid tile count

Patch available: openslide/openslide v4.0.1 (PR #751 merged 2026-06-06)

https://github.com/openslide/openslide/pull/751
github Patch Available

Arbitrary memory write with crafted Ventana BIF file in OpenSlide 3.4.1 and 4.0.0 (CVE-2026-48977) · Advisory · openslide/openslide · GitHub

https://github.com/openslide/openslide/security/advisories/GHSA-mxg2-48g7-fmwc

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 6× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 20:33 UTCEG score recompute
  2. 2026-09-18 20:10 UTCEG score recompute
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 21:20 UTCEG score recompute
  5. 2026-09-17 20:34 UTCEG score recompute
  6. 2026-09-17 20:34 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-48977?
CVE-2026-48977 is a high vulnerability published on September 17, 2026. OpenSlide is a C library for reading whole slide image files. From 3.4.1 until 4.0.1, OpenSlide's parselevel0xml() 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…
When was CVE-2026-48977 disclosed?
CVE-2026-48977 was first published in the National Vulnerability Database on September 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48977 actively exploited?
CVE-2026-48977 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 77.6% of all scored CVEs.
What is the CVSS score of CVE-2026-48977?
CVE-2026-48977 has a CVSS v3 base score of 7.7 (NVD).
How do I remediate CVE-2026-48977?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48977, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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