{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-58226", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-06-29T18:54:08.633Z", "datePublished": "2026-07-06T09:03:47.374Z", "dateUpdated": "2026-07-06T09:03:47.374Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["Elixir.HPAX", "Elixir.HPAX.Types"], "packageName": "hpax", "packageURL": "pkg:hex/hpax", "product": "hpax", "programFiles": ["lib/hpax.ex", "lib/hpax/types.ex"], "programRoutines": [{"name": "'Elixir.HPAX':decode/2"}, {"name": "'Elixir.HPAX.Types':decode_integer/2"}, {"name": "'Elixir.HPAX.Types':decode_remaining_integer/3"}], "repo": "https://github.com/elixir-mint/hpax", "vendor": "elixir-mint", "versions": [{"lessThan": "1.0.4", "status": "affected", "version": "0.1.1", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "modules": ["Elixir.HPAX", "Elixir.HPAX.Types"], "packageName": "elixir-mint/hpax", "packageURL": "pkg:github/elixir-mint/hpax", "product": "hpax", "programFiles": ["lib/hpax.ex", "lib/hpax/types.ex"], "programRoutines": [{"name": "'Elixir.HPAX':decode/2"}, {"name": "'Elixir.HPAX.Types':decode_integer/2"}, {"name": "'Elixir.HPAX.Types':decode_remaining_integer/3"}], "repo": "https://github.com/elixir-mint/hpax", "vendor": "elixir-mint", "versions": [{"lessThan": "1ba4bb2dc91e80089cf89c73970ac3ded76f17eb", "status": "affected", "version": "56db437a7e2c515e3bdd770ac7947b02cd2390d0", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.0.4", "versionStartIncluding": "0.1.1", "vulnerable": true}], "negate": false, "operator": "AND"}], "operator": "OR"}], "credits": [{"lang": "en", "type": "finder", "value": "Peter Ullrich"}, {"lang": "en", "type": "remediation developer", "value": "Andrea Leopardi"}, {"lang": "en", "type": "analyst", "value": "Jonatan M\u00e4nnchen / EEF"}, {"lang": "en", "type": "analyst", "value": "Eric Meadows-J\u00f6nsson"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding.</p><p><tt>hpax</tt> decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. <tt>'Elixir.HPAX.Types':decode_remaining_integer/3</tt> accumulates the integer as <tt>int + (value &lt;&lt;&lt; m)</tt>, shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the <tt>'Elixir.HPAX':decode/2</tt> entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification.</p><p>This issue affects <tt>hpax</tt> from 0.1.1 before 1.0.4.</p>"}], "value": "Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding.\n\nhpax decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. 'Elixir.HPAX.Types':decode_remaining_integer/3 accumulates the integer as int + (value <<< m), shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the 'Elixir.HPAX':decode/2 entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification.\n\nThis issue affects hpax from 0.1.1 before 1.0.4."}], "impacts": [{"capecId": "CAPEC-130", "descriptions": [{"lang": "en", "value": "CAPEC-130 Excessive Allocation"}]}], "metrics": [{"cvssV4_0": {"attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 8.7, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/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"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-407", "description": "CWE-407 Inefficient Algorithmic Complexity", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-07-06T09:03:47.374Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/elixir-mint/hpax/security/advisories/GHSA-jj2p-32j7-whj2"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-58226.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-58226"}, {"tags": ["patch"], "url": "https://github.com/elixir-mint/hpax/commit/1ba4bb2dc91e80089cf89c73970ac3ded76f17eb"}], "source": {"discovery": "EXTERNAL"}, "title": "Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax", "x_generator": {"engine": "cvelib 1.8.0"}}}}

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