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CVE-2026-43967— Quadratic fragment-name uniqueness check causes denial of service in absinthe

Quick assessment

Affected
absinthe-graphql absinthe
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.

Absinthe是Absinthe开源的一个基于Elixir的GraphQL实现框架。 Absinthe 1.2.0至1.10.2之前版本存在安全漏洞，该漏洞源于片段名称唯一性验证存在二次算法复杂度问题，可能导致未经身份验证的拒绝服务攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.62% · P50

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
absinthe-graphql absinthe 1.2.0< 1.10.2 affected
0b46e3bcc06c0d3797bacd64761b908a84646c1d< 223600c520493dcaf95080af552c413099f92c9d affected
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I. Basic Information for CVE-2026-43967

Vulnerability Information
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Vulnerability Title
Quadratic fragment-name uniqueness check causes denial of service in absinthe
Source: CVE Program / CVE List V5
Vulnerability Description
Inefficient Algorithmic Complexity vulnerability in absinthe-graphql absinthe allows unauthenticated denial of service via quadratic fragment-name uniqueness validation. 'Elixir.Absinthe.Phase.Document.Validation.UniqueFragmentNames':run/2 iterates over all fragments and for each one calls duplicate?/2, which evaluates Enum.count(fragments, &(&1.name == name)) — a full linear scan of the fragment list. The result is O(N²) comparisons per document, where N is the number of fragment definitions supplied by the caller. Because input.fragments is built directly from the GraphQL query body, N is fully attacker-controlled. A minimum-size fragment definition is roughly 16 bytes, so a ~1 MB document carries ~60,000 fragments and forces ~3.6 × 10⁹ comparisons inside this single validation phase. No authentication, schema knowledge, or special configuration is required. This issue affects absinthe: from 1.2.0 before 1.10.2.
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
Absinthe 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Absinthe是Absinthe开源的一个基于Elixir的GraphQL实现框架。 Absinthe 1.2.0至1.10.2之前版本存在安全漏洞，该漏洞源于片段名称唯一性验证存在二次算法复杂度问题，可能导致未经身份验证的拒绝服务攻击。
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
absinthe-graphql absinthe 1.2.0 ~ 1.10.2 cpe:2.3:a:absinthe-graphql:absinthe:*:*:*:*:*:*:*:*
absinthe-graphql absinthe 0b46e3bcc06c0d3797bacd64761b908a84646c1d ~ 223600c520493dcaf95080af552c413099f92c9d cpe:2.3:a:absinthe-graphql:absinthe:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-43967

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III. Intelligence Information for CVE-2026-43967

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Patches & Fixes for CVE-2026-43967 (1)

Vendor Advisories for CVE-2026-43967 (3)

Same Patch Batch · absinthe-graphql · 2026-05-08 · 3 CVEs total

CVE-2026-42793 Atom table exhaustion via attacker-controlled GraphQL SDL names in absinthe
CVE-2026-42794 Reflected XSS via backslash bypass in GraphiQL js_escape in absinthe_plug

IV. Related Vulnerabilities

Same product: absinthe
Same vendor: absinthe-graphql
Same weakness: CWE-407