CVE-2026-45137Public exploitNetwork attack vector

Payment bypass via system-program account substitution

Published May 27, 2026 · Updated May 27, 2026

Improper input validation in Anchor 1.0.0 through 1.0.1 allows remote attackers to bypass system-program account checks in Solana programs. Program::try_from treats the default public key as an untyped-program sentinel, so Program accepts any executable program because the system ID is also the default key. Exploitation requires a program that trusts Program validation and uses the supplied account for a cross-program invocation, enabling payment bypass or attacker-controlled account ownership.

CVSS severity8.2
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Anchor 1.0.0 through 1.0.1 allows remote attackers to bypass system-program account checks in Solana programs. Program::try_from treats the default public key as an untyped-program sentinel, so Program accepts any executable program because the system ID is also the default key. Exploitation requires a program that trusts Program validation and uses the supplied account for a cross-program invocation, enabling payment bypass or attacker-controlled account ownership.

The record

CVE
CVE-2026-45137
Published
May 27, 2026
Updated
May 27, 2026
Vendor
OtterSec
Product
Anchor
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=>= 1.0.0, < 1.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OtterSec · Anchorversion=>= 1.0.0, < 1.0.2

Published CVSS scores

8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A: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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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