EUVD-2026-57604Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
C:L added over NVD baseline to reflect information disclosure potential inherent to request smuggling; all other metrics align with unauthenticated network exploitation.
Primary rating from Vendor (apple).
CVSS VectorVendor: apple
Lifecycle Timeline
5DescriptionCVE.org
ServiceTalk HTTP/1.x incorrectly handles malformed Transfer-Encoding which could result in request smuggling attacks. This vulnerability is addressed in servicetalk version 0.42.65.
AnalysisAI
Request smuggling in Apple ServiceTalk's HTTP/1.x implementation exposes services to request pipeline injection by exploiting improper parsing of malformed Transfer-Encoding headers. All ServiceTalk deployments running versions prior to 0.42.65 are vulnerable, with the CVSS vector confirming unauthenticated network exploitation with high integrity impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation is most effective when ServiceTalk is deployed behind a front-end HTTP/1.x proxy or load balancer that does not strictly normalize or reject malformed Transfer-Encoding headers before forwarding - this is the standard request smuggling topology required for desynchronization. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 High score (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) accurately captures the network-accessible, zero-authentication nature of the flaw and its high integrity impact - attackers can tamper with the content of other users' requests. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to ServiceTalk version 0.42.65 or later, which is confirmed by the vendor as the fix release per the advisory at https://github.com/apple/servicetalk/security/advisories/GHSA-56h2-h3h4-m9x6. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Apple ServiceTalk deployments and document current versions in your environment. …
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Same weakness CWE-444 – HTTP Request/Response Smuggling
View allSame technique Request Smuggling
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External POC / Exploit Code
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