CVE-2026-4012Public exploit

Local memory disclosure via trailing escape sequence

Published Mar 12, 2026 · Updated Mar 12, 2026

Out-of-bounds read in rxi fe allows local users to read adjacent process data through a source file ending with a backslash. In read_ in src/fe.c, an EOF after a backslash makes strchr match the NUL terminator and the subsequent [1] access read one byte beyond the escape-map literal. Local access and control of an interpreted source file are required; the demonstrated result is a one-byte invalid read, with no integrity or availability impact reported.

CVSS severity3.3
Low
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in rxi fe allows local users to read adjacent process data through a source file ending with a backslash. In read_ in src/fe.c, an EOF after a backslash makes strchr match the NUL terminator and the subsequent [1] access read one byte beyond the escape-map literal. Local access and control of an interpreted source file are required; the demonstrated result is a one-byte invalid read, with no integrity or availability impact reported.

The record

CVE
CVE-2026-4012
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
rxi
Product
fe
Classifications
CWE-119, CWE-125, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 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?

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  1. Affected versionversion=ed4cda96bd582cbb08520964ba627efb40f3dd91

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

rxi · feversion=ed4cda96bd582cbb08520964ba627efb40f3dd91

Published CVSS scores

1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
1.7VulDBAV:L/AC:L/Au:S/C:P/I:N/A:N
3.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/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.

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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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-125Out-of-bounds Read
T1203Exploitation for Client Execution

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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