Express compression leaks native memory until the process dies
Direct answer
Express compression leaks native memory until the process dies, also tracked as CVE-2026-87776 is a high-severity threat campaign HOL Guard tracked from Sep 11, 2026 to Sep 11, 2026, verified against 3 primary sources and last reviewed Sep 20, 2026. Active tracking has ended and the record remains published as a permanent historical research record.
Express compression zlib abort handling can leak native memory until the process dies. Upgrade to the patched release.
Also tracked as CVE-2026-87776
- First observed
- Sep 11, 2026
- Last observed
- Sep 11, 2026
- Last reviewed
- Sep 20, 2026
- Tracking ended
- Sep 11, 2026
Record exports
Uncertainty and limitations
Read the evidence limits before acting on this record.
Confirm exact fixed version against the live advisory.
- Campaign tracks CVE-2026-87776 only.
- Does not invent CVSS or fixed versions beyond cited sources.
- HOL blog is operator guidance.
Guard coverage and policy
What Guard's reviewed assertions do and do not claim for this campaign, and the reviewed starting points for defense.
No Guard coverage mapping or campaign-specific policy guidance is published for this record.
Safe next step. Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.
Timeline
Reviewed events, oldest first, each tied to a verified source.
- Disclosure
CVE-2026-87776 Express compression memory DoS disclosed.
Publication clock: 235.4 hours from reviewed disclosure timestamp to HOL publication; 24-hour high target; historical backfill outside target.
Sources
Every claim on this record is traceable to the sources below.
Campaign questions, answered
Express compression zlib abort handling can leak native memory until the process dies. Upgrade to the patched release. HOL Guard tracked the campaign from Sep 11, 2026 to Sep 11, 2026.
No. Active tracking ended Sep 11, 2026; this page remains as a labeled historical research record and does not imply the threat is currently active.
The record cites 3 primary sources, names 0 reviewed artifacts, and was last fully reviewed Sep 20, 2026 by HOL Guard Security Publishing. Its uncertainty and limitations are stated on the record itself.
Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.
The permalink above is permanent. The full record can be downloaded from this page as JSON, an artifact CSV, and a STIX 2.1 bundle, and corrections can be requested through the published correction path on the record. Confirm exact fixed version against the live advisory.
Reviewed in full by HOL Guard Security Publishing.
- Published
- Last full review
- Last modified
Record HGTC-2026-CB4212AF