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CVE-2026-58226— Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax

Quick assessment

Affected
elixir-mint hpax
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Elixir Mint HPAX是Elixir Mint组织的一款HTTP客户端库。 Elixir Mint HPAX 0.1.1版本至1.0.4之前版本存在资源管理错误漏洞，该漏洞源于算法复杂性低效，对HPACK变长整数解码无上限，可能导致未经身份验证的攻击者通过发送特制HTTP/2标头块，造成拒绝服务攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.57% · P47

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
elixir-mint hpax 0.1.1< 1.0.4 affected
56db437a7e2c515e3bdd770ac7947b02cd2390d0< 1ba4bb2dc91e80089cf89c73970ac3ded76f17eb affected
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I. Basic Information for CVE-2026-58226

Vulnerability Information
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Vulnerability Title
Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax
Source: CVE Program / CVE List V5
Vulnerability Description
Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding. hpax 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. This issue affects hpax from 0.1.1 before 1.0.4.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
Elixir Mint HPAX 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elixir Mint HPAX是Elixir Mint组织的一款HTTP客户端库。 Elixir Mint HPAX 0.1.1版本至1.0.4之前版本存在资源管理错误漏洞，该漏洞源于算法复杂性低效，对HPACK变长整数解码无上限，可能导致未经身份验证的攻击者通过发送特制HTTP/2标头块，造成拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
elixir-mint hpax 0.1.1 ~ 1.0.4 cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*
elixir-mint hpax 56db437a7e2c515e3bdd770ac7947b02cd2390d0 ~ 1ba4bb2dc91e80089cf89c73970ac3ded76f17eb cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-58226

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III. Intelligence Information for CVE-2026-58226

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Patches & Fixes for CVE-2026-58226 (1)

Vendor Advisories for CVE-2026-58226 (3)

IV. Related Vulnerabilities

Same vendor: elixir-mint
Same weakness: CWE-407