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2 vulnerabilities found for hpax by elixir-mint
CVE-2026-58226 (GCVE-0-2026-58226)
Vulnerability from nvd – Published: 2026-07-06 09:03 – Updated: 2026-07-06 14:04
VLAI
Title
Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/elixir-mint/hpax/security/advi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-58226.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-58226 | related |
| https://github.com/elixir-mint/hpax/commit/1ba4bb… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| elixir-mint | hpax |
Affected:
0.1.1 , < 1.0.4
(semver)
cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:* |
|
| elixir-mint | hpax |
Affected:
56db437a7e2c515e3bdd770ac7947b02cd2390d0 , < 1ba4bb2dc91e80089cf89c73970ac3ded76f17eb
(git)
cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:* |
Credits
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CVE-2026-58226 (GCVE-0-2026-58226)
Vulnerability from cvelistv5 – Published: 2026-07-06 09:03 – Updated: 2026-07-06 14:04
VLAI
Title
Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/elixir-mint/hpax/security/advi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-58226.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-58226 | related |
| https://github.com/elixir-mint/hpax/commit/1ba4bb… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| elixir-mint | hpax |
Affected:
0.1.1 , < 1.0.4
(semver)
cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:* |
|
| elixir-mint | hpax |
Affected:
56db437a7e2c515e3bdd770ac7947b02cd2390d0 , < 1ba4bb2dc91e80089cf89c73970ac3ded76f17eb
(git)
cpe:2.3:a:elixir-mint:hpax:*:*:*:*:*:*:*:* |
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"dataVersion": "5.2"
}