{"id":"CVE-2026-82728","state":"PUBLISHED","title":"Unbounded HTTP/1 status-line and chunk-extension buffering in Mint causes memory-exhaustion DoS","description":"Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint mint allows a remote HTTP server to exhaust memory on the client host and cause a denial of service.\n\nTwo HTTP/1 response-parser states accumulate server data without any cap. In lib/mint/http1.ex, decode_status_line/4 stores the unconsumed data in conn.buffer when the status line is incomplete, and decode_body/5 does the same for an unterminated chunk-extension line. Both wait for a CRLF the server never has to send, and conn.buffer is prepended to every subsequent socket message. The :max_header_list_size budget is wired only into decode_headers/5 and decode_trailer_headers/4, so neither of these states is covered by it. A malicious server, or one reached through an attacker-controlled redirect or a fetched URL, streams bytes indefinitely until the BEAM node is killed by the operating system out-of-memory handler. The chunk-extension variant is reached after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.\n\nThis issue affects mint: from 0.1.0 before 1.10.0.","publishedAt":"2026-09-04T14:31:30.059Z","updatedAt":"2026-09-04T19:32:44.727Z","severity":{"score":8.2,"label":"High","version":"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","source":"EEF"},"assigner":"EEF","products":["elixir-mint mint"],"affected":[{"vendor":"elixir-mint","product":"mint","packageName":"mint","packageURL":"pkg:hex/mint","defaultStatus":"unaffected","versions":[{"version":"0.1.0","status":"affected","lessThan":"1.10.0","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"],"modules":["'Elixir.Mint.HTTP1'"],"programFiles":["lib/mint/http1.ex"],"programRoutines":[{"name":"'Elixir.Mint.HTTP1':decode_status_line/4"},{"name":"'Elixir.Mint.HTTP1':decode_body/5"}],"repo":"https://github.com/elixir-mint/mint"},{"vendor":"elixir-mint","product":"mint","packageName":"elixir-mint/mint","packageURL":"pkg:github/elixir-mint/mint","defaultStatus":"unaffected","versions":[{"version":"c088e4b6430545338841ab8d294369e45d39856a","status":"affected","lessThan":"19be5558b6a317e271c78666498dd78b151e490a","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"],"modules":["'Elixir.Mint.HTTP1'"],"programFiles":["lib/mint/http1.ex"],"programRoutines":[{"name":"'Elixir.Mint.HTTP1':decode_status_line/4"},{"name":"'Elixir.Mint.HTTP1':decode_body/5"}],"repo":"https://github.com/elixir-mint/mint"}],"references":["https://github.com/elixir-mint/mint/security/advisories/GHSA-g83f-2j6r-q6m4","https://cna.erlef.org/cves/CVE-2026-82728.html","https://osv.dev/vulnerability/EEF-CVE-2026-82728","https://github.com/elixir-mint/mint/commit/19be5558b6a317e271c78666498dd78b151e490a"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/82xxx/CVE-2026-82728.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-82728","state":"PUBLISHED","datePublished":"2026-09-04T14:31:30.059Z","dateUpdated":"2026-09-04T19:32:44.727Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-08-31T00:59:08.960Z"},"containers":{"cna":{"title":"Unbounded HTTP/1 status-line and chunk-extension buffering in Mint causes memory-exhaustion DoS","descriptions":[{"lang":"en","value":"Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint mint allows a remote HTTP server to exhaust memory on the client host and cause a denial of service.\n\nTwo HTTP/1 response-parser states accumulate server data without any cap. In lib/mint/http1.ex, decode_status_line/4 stores the unconsumed data in conn.buffer when the status line is incomplete, and decode_body/5 does the same for an unterminated chunk-extension line. Both wait for a CRLF the server never has to send, and conn.buffer is prepended to every subsequent socket message. The :max_header_list_size budget is wired only into decode_headers/5 and decode_trailer_headers/4, so neither of these states is covered by it. A malicious server, or one reached through an attacker-controlled redirect or a fetched URL, streams bytes indefinitely until the BEAM node is killed by the operating system out-of-memory handler. The chunk-extension variant is reached after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.\n\nThis issue affects mint: from 0.1.0 before 1.10.0."}],"affected":[{"vendor":"elixir-mint","product":"mint","packageName":"mint","packageURL":"pkg:hex/mint","defaultStatus":"unaffected","versions":[{"version":"0.1.0","status":"affected","lessThan":"1.10.0","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"],"modules":["'Elixir.Mint.HTTP1'"],"programFiles":["lib/mint/http1.ex"],"programRoutines":[{"name":"'Elixir.Mint.HTTP1':decode_status_line/4"},{"name":"'Elixir.Mint.HTTP1':decode_body/5"}],"repo":"https://github.com/elixir-mint/mint"},{"vendor":"elixir-mint","product":"mint","packageName":"elixir-mint/mint","packageURL":"pkg:github/elixir-mint/mint","defaultStatus":"unaffected","versions":[{"version":"c088e4b6430545338841ab8d294369e45d39856a","status":"affected","lessThan":"19be5558b6a317e271c78666498dd78b151e490a","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"],"modules":["'Elixir.Mint.HTTP1'"],"programFiles":["lib/mint/http1.ex"],"programRoutines":[{"name":"'Elixir.Mint.HTTP1':decode_status_line/4"},{"name":"'Elixir.Mint.HTTP1':decode_body/5"}],"repo":"https://github.com/elixir-mint/mint"}],"references":[{"url":"https://github.com/elixir-mint/mint/security/advisories/GHSA-g83f-2j6r-q6m4","tags":["vendor-advisory","related"]},{"url":"https://cna.erlef.org/cves/CVE-2026-82728.html","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-82728","tags":["related"]},{"url":"https://github.com/elixir-mint/mint/commit/19be5558b6a317e271c78666498dd78b151e490a","tags":["patch"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","description":"CWE-770 Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"EEF","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateUpdated":"2026-09-04T14:31:30.059Z"},"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*","versionEndExcluding":"1.10.0","versionStartIncluding":"0.1.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"AND"}],"credits":[{"lang":"en","type":"finder","value":"Tr3bor"},{"lang":"en","type":"reporter","value":"Tr3bor"},{"lang":"en","type":"remediation developer","value":"Andrea Leopardi"},{"lang":"en","type":"coordinator","value":"Jonatan Männchen / EEF"}],"impacts":[{"capecId":"CAPEC-130","descriptions":[{"lang":"en","value":"CAPEC-130 Excessive Allocation"}]}],"source":{"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/elixir-mint/mint/security/advisories/GHSA-g83f-2j6r-q6m4","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-04T19:32:07.642690Z","id":"CVE-2026-82728","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-04T19:32:44.727Z"}}]}}}