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CVE-2023-23457

Upx: segv on packlinuxelf64::invert_pt_dynamic() in p_lx_elf.cpp

MEDIUM
5.5
CVSS Score
Published: January 12, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 05:37 AM UTC
2 products affected across 2 vendorsFedoraUpx

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.4%
SSVC
PoC

Description

A Segmentation fault was found in UPX in PackLinuxElf64::invert_pt_dynamic() in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.

Affected

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

Fedora· Fedora Projectrpm
95%
3637
Upx· Upx
95%
v < 2022-11-23
Affected range stops below 2022-11-23, so it looks safe — our inference, not a vendor statement

References (5)

Issue TrackingPatchThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2160382
PatchThird Party Advisory
Source: [email protected]
https://github.com/upx/upx/commit/779b648c5f6aa9b33f4728f79dd4d0efec0bf860
ExploitPatchThird Party Advisory
Source: [email protected]
https://github.com/upx/upx/issues/631
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EL3BVKIGG3SH6I3KPOYQAWCBD4UMPOPI/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TGEP3FBNRZXGLIA2B2ICMB32JVMPREFZ/

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

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

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-119

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