{"id":"CVE-2026-91043","revision":null,"records":[{"revision":"d7db8b9d63b34e2794d564d364bb34c4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-91043","aliases":[],"title":"HPACK-indexed cookie fields in Mint HTTP/2 responses bypass max_header_list_size and exhaust client memory","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.\n\nMint.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.\n\nThis issue affects mint: from 1.1.0 before 1.10.2.","state":0,"publishedAt":"2026-09-28T11:15:09.158+00:00","modifiedAt":"2026-09-29T10:15:15.619+00:00","affected":[{"ecosystem":"https://repo.hex.pm","name":"mint","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://repo.hex.pm\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"'Elixir.Mint.HTTP2'\"\n                    ],\n                    \"packageName\": \"mint\",\n                    \"packageURL\": \"pkg:hex/mint\",\n                    \"product\": \"mint\",\n                    \"programFiles\": [\n                        \"lib/mint/http2.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"'Elixir.Mint.HTTP2':stream/2\"\n                        },\n                        {\n                            \"name\": \"'Elixir.Mint.HTTP2':decode_hbf_and_add_responses/5\"\n                        },\n                        {\n                            \"name\": \"'Elixir.Mint.HTTP2':join_cookie_headers/1\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/elixir-mint/mint\",\n                    \"vendor\": \"elixir-mint\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"1.10.2\",\n                            \"status\": \"affected\",\n                            \"version\": \"1.1.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"elixir-mint/mint","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"'Elixir.Mint.HTTP2'\"\n                    ],\n                    \"packageName\": \"elixir-mint/mint\",\n                    \"packageURL\": \"pkg:github/elixir-mint/mint\",\n                    \"product\": \"mint\",\n                    \"programFiles\": [\n                        \"lib/mint/http2.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"'Elixir.Mint.HTTP2':stream/2\"\n                        },\n                        {\n                            \"name\": \"'Elixir.Mint.HTTP2':decode_hbf_and_add_responses/5\"\n                        },\n                        {\n                            \"name\": \"'Elixir.Mint.HTTP2':join_cookie_headers/1\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/elixir-mint/mint\",\n                    \"vendor\": \"elixir-mint\",\n                    \"versions\": [\n                        {\n                            \"changes\": [\n                                {\n                                    \"at\": \"c7895cb022196c77ec35570c8e873a84393ff4b8\",\n                                    \"status\": \"unaffected\"\n                                },\n                                {\n                                    \"at\": \"65a0d61c9eab6b0dedac809de7212515bf506250\",\n                                    \"status\": \"unaffected\"\n                                }\n                            ],\n                            \"lessThan\": \"*\",\n                            \"status\": \"affected\",\n                            \"version\": \"8e0e04680476f90f9f68db4dfeabcbe66dabfc4d\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.2,"severity":"HIGH"}],"references":["https://github.com/elixir-mint/mint/security/advisories/GHSA-9x8p-qrf4-jq7g","https://cna.erlef.org/cves/CVE-2026-91043.html","https://osv.dev/vulnerability/EEF-CVE-2026-91043","https://github.com/elixir-mint/mint/commit/8e0e04680476f90f9f68db4dfeabcbe66dabfc4d","https://github.com/elixir-mint/mint/commit/c7895cb022196c77ec35570c8e873a84393ff4b8","https://github.com/elixir-mint/mint/commit/65a0d61c9eab6b0dedac809de7212515bf506250"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-91043","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-91043","identifiers":["CVE-2026-91043"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-12T07:54:58.2349119+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-12T07:54:58.2349119+00:00","lastSuccessAt":"2026-11-12T07:54:58.4848198+00:00","error":null,"lastVerifiedAt":"2026-11-12T07:54:58.4848225+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-64752486c567b55b31fb0d7225f5222bcd0019564ac0ac5f0649e242c7b19299-1225a640a70b576ed1a85d2671a302d70a8e18168f570c1f4912faf8f66b1119","complete":true,"records":424623,"lastAttemptAt":"2026-11-12T07:53:22.876714+00:00","lastSuccessAt":"2026-11-12T07:53:22.8444514+00:00","error":null,"lastVerifiedAt":"2026-11-12T07:53:22.876714+00:00","snapshotPublishedAt":"2026-11-12T07:24:53+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-570328139368428ca550af1570d01579","complete":true,"records":13760,"lastAttemptAt":"2026-11-12T07:55:38.9446123+00:00","lastSuccessAt":"2026-11-12T06:55:06.923+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:55:06.923+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13813,"expectedIdentifiers":13813,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-12T07:54:58.2349119+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-12T07:54:58.2349119+00:00","lastSuccessAt":"2026-11-12T07:54:58.4862124+00:00","error":null,"lastVerifiedAt":"2026-11-12T07:54:58.4862143+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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