CVE-2023-4156

Heap out of bound read in builtin.c

HIGH

7.1

CVSS Score

Published: September 25, 2023 at 05:20 PM UTC

Updated: June 17, 2026 at 06:37 AM UTC

3 products affected across 3 vendorsFedoraEnterprise LinuxGawk

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Severity

HIGH7.1

Exploit prediction

EPSS 0.4%

SSVC

PoC

Description

A heap out-of-bounds read flaw was found in builtin.c in the gawk package. This issue may lead to a crash and could be used to read sensitive information.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora · Fedora Projectrpm

95%

Gawk · Gnu

95%

v < 5.1.1

Affected range stops below 5.1.1, so it looks safe — our inference, not a vendor statement

Enterprise Linux · Red Hatrpm

95%

6.0 7.0

Vendor states this is fixed in 6 (unknown)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

VDB Entryx_refsource_REDHATExploitIssue TrackingRelease NotesThird Party Advisory

Source: [email protected]

https://access.redhat.com/security/cve/CVE-2023-4156

Issue Trackingx_refsource_REDHATExploitRelease NotesThird Party Advisory

Source: [email protected]

https://bugzilla.redhat.com/show_bug.cgi?id=2215930

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGH[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-125

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