CVE-2026-15957Network attack vector

Unauthenticated process abort via recursive deserialization

Published Jul 21, 2026 · Updated Jul 21, 2026

Uncontrolled recursion in AWS SDK for Rust before release-2026-06-02 allows remote attackers to abort a process through stack exhaustion. Generated JSON, CBOR, and XML deserializers recurse without a depth limit when decoding deeply nested data for a recursive model shape. A small unauthenticated request can reach an exposed generated SDK or server and terminate its process; confidentiality and integrity are unaffected.

CVSS severity8.7
High
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in AWS SDK for Rust before release-2026-06-02 allows remote attackers to abort a process through stack exhaustion. Generated JSON, CBOR, and XML deserializers recurse without a depth limit when decoding deeply nested data for a recursive model shape. A small unauthenticated request can reach an exposed generated SDK or server and terminate its process; confidentiality and integrity are unaffected.

The record

CVE
CVE-2026-15957
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Amazon Web Services
Product
AWS SDK for Rust
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <release-2026-06-02

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Amazon Web Services · AWS SDK for Rustversion=0 <release-2026-06-02

Published CVSS scores

7.5Amazon Web ServicesCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7Amazon Web ServicesCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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