CVE-2026-32777

MEDIUMNVD 5.54.0▼
EchelonGraph scoreMEDIUM confidence

Score 4.0 from GitHub Security Advisory published 2026-03-16. the CNA's CVSS baseline 4.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:mitre, ghsa
Trending — 6 sources updated this week
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

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

libexpat before 2.7.5 allows an infinite loop while parsing DTD content.

CVSS v3
5.5
EG Score
4.0(medium)
EPSS
12.0%
KEV
Not listed

Published

March 16, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 14, 2026
⚠️ Active exploitation confirmed. Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic🔴 Active Exploitation

SSA-082556

https://cert-portal.siemens.com/productcert/html/ssa-082556.html
generic

OSS Fuzz

https://issues.oss-fuzz.com/issues/486993411
github_pr

[CVE-2026-32777] lib: Reject `XML_TOK_INSTANCE_START` infinite loop in `entityValueProcessor` (fixes #1161)

Fix merged in libexpat/libexpat PR #1162 on 2026-03-16 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/1162
github_pr

Prepare release 2.7.5 (part of #1157, ETA 2026-03-17)

Fix merged in libexpat/libexpat PR #1159 on 2026-03-17 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/1159
generic

[CVE-REQUESTED] OSS-Fuzz/ClusterFuzz finding 486993411 · Issue #1161 · libexpat/libexpat · GitHub

https://github.com/libexpat/libexpat/issues/1161

Vendor Advisories for CVE-2026-32777(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 9× 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. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-14 13:19 UTCNVD updateCVSS v3 → 5.5
  6. 2026-07-14 13:11 UTCEG score recompute
  7. 2026-07-14 13:11 UTCVendor advisory
  8. 2026-07-14 13:11 UTCGHSA enrichment
  9. 2026-07-14 13:11 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-32777?
CVE-2026-32777 is a medium vulnerability published on March 16, 2026. libexpat before 2.7.5 allows an infinite loop while parsing DTD content.
When was CVE-2026-32777 disclosed?
CVE-2026-32777 was first published in the National Vulnerability Database on March 16, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-32777 actively exploited?
CVE-2026-32777 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-32777?
CVE-2026-32777 has a CVSS v3 base score of 5.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 4.0.
How do I remediate CVE-2026-32777?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-32777, 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

Explore the affected products and dependency analysis for CVE-2026-32777

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