CVE-2026-11330Public exploit

Observation suppression via ambiguous hash input boundaries

Published Jun 5, 2026 · Updated Jun 5, 2026

Weak hashing in claude-mem 11.0.0 through 11.0.1 allows local users to suppress stored observations through hash collisions. computeObservationContentHash concatenates memorySessionId, title, and narrative without delimiters, so distinct field tuples produce the same truncated SHA-256 value. Low-privileged local access and carefully chosen field boundaries are required; a collision causes a legitimate observation to be silently deduplicated rather than stored.

CVSS severity3.6
Low
EPSS probability0.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak hashing in claude-mem 11.0.0 through 11.0.1 allows local users to suppress stored observations through hash collisions. computeObservationContentHash concatenates memorySessionId, title, and narrative without delimiters, so distinct field tuples produce the same truncated SHA-256 value. Low-privileged local access and carefully chosen field boundaries are required; a collision causes a legitimate observation to be silently deduplicated rather than stored.

The record

CVE
CVE-2026-11330
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
thedotmack
Product
claude-mem
Classifications
CWE-327, CWE-328, T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 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=11.0.0
  2. Affected versionversion=11.0.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

thedotmack · claude-memversion=11.0.0; version=11.0.1

Published CVSS scores

2.0VulDBCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
3.6VulDBCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
2.4VulDBAV:L/AC:H/Au:S/C:N/I:P/A:P

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.

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No observations available

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

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
CWE-328Use of Weak Hash
T1565.001Stored Data Manipulation

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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