CVE-2022-28805

Exp

singlevar in lparser.c in Lua from (including) 5.4.0 up to (excluding) 5.4.4 lacks a certain luaK_exp2anyregup call, leading to a heap-based buffer over-read that might affect a system that compiles untrusted Lua code.

Published: 2022-04-08 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-28805 is rated High Exploit Risk (81.3/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.92%). 3 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2022-28805

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2022-28805

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-25 2.84% 2.92% +0.08%
2 2026-06-15 0.18% 2.84% +2.66%
3 2026-05-28 — 0.18% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-28805

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2022-28805

OS Trackers for CVE-2022-28805

vendor priority summary link
alpine critical CVE-2022-28805: 1 source package rows (lua5.4); 7 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2022-28805
debian unimportant CVE-2022-28805 unimportant priority: Debian including 5 source packages (lua5.1, lua5.2, lua5.3, lua5.4, lua50), 21 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 20, open 1. https://security-tracker.debian.org/tracker/CVE-2022-28805
gentoo normal CVE-2022-28805: 1 GLSA(s) (202305-23), 1 atom(s) (dev-lang/lua); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-28805
redhat low — https://access.redhat.com/security/cve/CVE-2022-28805
suse medium CVE-2022-28805 severity moderate: SUSE including 15 source package names (liblua5_1, liblua5_1-32bit, …), 219 product×package rows across 48 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (48 product lines)): Known Not Affected 216, Fixed 3. https://www.suse.com/security/cve/CVE-2022-28805/
ubuntu medium CVE-2022-28805 medium priority: Ubuntu including 5 source packages (lua5.1, lua5.2, lua5.3, lua5.4, lua50), 70 status rows across 14 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 46, DNE 14, ignored 4, needs-triage 4, released 2. https://ubuntu.com/security/CVE-2022-28805

Affected software / configurations for CVE-2022-28805

Vendor Product Version Raw CPE
lua lua >= 5.4.0, < 5.4.5 cpe:2.3:a:lua:lua:*:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
fedoraproject fedora 36 cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*

References for CVE-2022-28805

cvelogic Threat Intelligence