Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-91043
elixir-mint mint — HPACK-indexed cookie fields in Mint HTTP/2 responses bypass max_header_list_size and exhaust client memory
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV
N L P N N N N H 8.2 .0042 34.3 —
AFFECTED
Product Versions Fixed
mint 1.1.0 – —
mint 8e0e04680476f90f9f68db4dfeabcbe66dabfc4d – c7895cb022196c77ec35570c8e873a84393ff4b8
TIMELINE
Sep 15 Reserved by EEF
Sep 28 PATCH SHIPPED — CVE-2026-91043 (elixir-mint mint). Fixed in mint c7895cb022196c77ec35570c8e873a84393ff4b8.
Sep 28 Published (CNA: EEF)
Description
Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint mint allows a malicious HTTP/2 server to exhaust memory on the client host and cause a denial of service.
Mint.HTTP2 enforces the client's max_header_list_size setting only on the compressed size of an inbound header block, while RFC 9113 section 6.5.2 defines the limit on the decoded header list. An HPACK indexed field costs one byte on the wire and decodes to a dynamic table entry of up to 4 KB, and join_cookie_headers/1 in lib/mint/http2.ex copies every cookie value of a response into one new binary. A header block under the default 256 KB wire limit therefore makes the client allocate about 1 GB for a single response, and several such responses in one delivery exhaust the memory of the process that owns the connection or of the whole VM.
This issue affects mint: from 1.1.0 before 1.10.2.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| September 15, 2026 | Reserved | Reserved by EEF |
| September 28, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-91043 (elixir-mint mint). Fixed in mint c7895cb022196c77ec35570c8e873a84393ff4b8. |
| September 28, 2026 | Published | Published (CNA: EEF) |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| elixir-mint | mint | — | 1.1.0 | — |
| elixir-mint | mint | — | 8e0e04680476f90f9f68db4dfeabcbe66dabfc4d | c7895cb022196c77ec35570c8e873a84393ff4b8 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-91043 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
