CVE-2026-87776

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 70% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

compression is a Node.js and Express compression middleware. In versions before 1.8.2, when a client aborts the connection while a compressed response is still being sent, the zlib stream created to compress that response is never destroyed, so each aborted compressed response leaks its native zlib memory. A remote unauthenticated attacker can repeatedly open requests and disconnect early, exhausting the available memory and crashing the server. All applications using compression are affected. The issue is fixed in compression 1.8.2, and users should upgrade to 1.8.2 or later.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 11, 2026
Patch available. Sources: github.
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html
github Patch Available

compression vulnerable to Denial of Service via memory leak on premature response close · Advisory · expressjs/compression · GitHub

https://github.com/expressjs/compression/security/advisories/GHSA-vc2v-76pw-4v95

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 17× in last 7d / 22× 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. 2026-09-19 11:04 UTCVendor advisory
  2. 2026-09-18 22:27 UTCEG score recompute
  3. 2026-09-18 22:27 UTCVendor advisory
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 09:50 UTCVendor advisory
  6. 2026-09-17 21:13 UTCEG score recompute
  7. 2026-09-17 21:13 UTCVendor advisory
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-17 08:36 UTCVendor advisory
  10. 2026-09-16 19:59 UTCEG score recompute
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 08:50 UTCEG score recompute
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 06:53 UTCEG score recompute
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-13 16:51 UTCEG score recompute
  17. 2026-09-12 15:37 UTCEG score recompute
  18. 2026-09-11 14:23 UTCEG score recompute
  19. 2026-09-11 13:46 UTCEG score recompute
  20. 2026-09-11 12:22 UTCEG score recompute
  21. 2026-09-11 11:38 UTCEG score recompute
  22. 2026-09-11 11:34 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-87776?
CVE-2026-87776 is a high vulnerability published on September 11, 2026. compression is a Node.js and Express compression middleware. In versions before 1.8.2, when a client aborts the connection while a compressed response is still being sent, the zlib stream created to compress that response is never destroyed, so each aborted compressed response leaks its native zlib…
When was CVE-2026-87776 disclosed?
CVE-2026-87776 was first published in the National Vulnerability Database on September 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87776 actively exploited?
CVE-2026-87776 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 69.9% of all scored CVEs.
What is the CVSS score of CVE-2026-87776?
CVE-2026-87776 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-87776?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87776, 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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