CVE-2022-23852 [Critical] | Integer Overflow in Libexpat

CVE-2022-23852 is rated High Risk (70.7/100): CVSS Critical severity, with high exploitation likelihood (EPSS 4.52%, 90th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-28	4.65%	4.52%	-0.13%
2	2026-06-15	1.62%	4.65%	+3.03%
3	2026-05-19	—	1.62%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-28

4.65%

4.52%

-0.13%

2026-06-15

1.62%

4.65%

+3.03%

2026-05-19

—

1.62%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	[email protected]
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/C:P/I:P/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:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

[email protected]

9.8

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

134c704f-9b21-4f2e-91b3-4a467353bcc0

7.5

2.0

HIGH

AV:N/AC:L/Au:N/C:P/I:P/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:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

6.4

[email protected]

OS Trackers for CVE-2022-23852

vendor	priority	summary	link
`alpine`	—	CVE-2022-23852: 2 source package rows (expat, qt5-qtwebengine); 15 state rows across 15 repos (3.12-main, 3.17-community, 3.17-main, 3.18-community, 3.18-main, 3.19-community, 3.19-main, 3.20-community, 3.20-main, 3.21-community, 3.21-main, 3.22-community, 3.22-main, edge-community, edge-main); fixed 15, open 0.	https://security.alpinelinux.org/vuln/CVE-2022-23852
`debian`	not yet assigned	CVE-2022-23852 not yet assigned priority: Debian including 2 source packages (expat, libxmltok), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5, open 2.	https://security-tracker.debian.org/tracker/CVE-2022-23852
`gentoo`	high	CVE-2022-23852: 1 GLSA(s) (202209-24), 1 atom(s) (dev-libs/expat); latest impact high.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-23852
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-23852
`suse`	high	CVE-2022-23852 severity important: SUSE including 323 source package names (0.9.0-rev1.1.0-build3.2.14:libexpat1-2.2.5-3.12.1, 1.1.1.0.1.5.568:libexpat1-2.2.5-3.12.1, …), 566 product×package rows across 147 product lines (Container bci/bci-init, Container bci/golang, … (147 product lines)): Fixed 387, Known Affected 175, Known Not Affected 4.	https://www.suse.com/security/cve/CVE-2022-23852/
`ubuntu`	medium	CVE-2022-23852 medium priority: Ubuntu including 24 source packages (apache2, apr-util, …), 337 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 121, DNE 87, ignored 52, needs-triage 42, released 21, needed 14.	https://ubuntu.com/security/CVE-2022-23852

Affected software / configurations for CVE-2022-23852

Vendor	Product	Version	Raw CPE
libexpat_project	libexpat	< 2.4.4	cpe:2.3:a:libexpat_project:libexpat::::::::
netapp	clustered_data_ontap	—	cpe:2.3:a:netapp:clustered_data_ontap:-:::::::*
netapp	oncommand_workflow_automation	—	cpe:2.3:a:netapp:oncommand_workflow_automation:-:::::::*
tenable	nessus	< 8.15.3	cpe:2.3:a:tenable:nessus::::::::
tenable	nessus	>= 10.0.0, < 10.1.1	cpe:2.3:a:tenable:nessus::::::::
oracle	communications_metasolv_solution	6.3.1	cpe:2.3:a:oracle:communications_metasolv_solution:6.3.1:::::::*
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*
siemens	sinema_remote_connect_server	< 3.1	cpe:2.3:a:siemens:sinema_remote_connect_server::::::::

References for CVE-2022-23852

URL	Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf	Third Party Advisory
https://github.com/libexpat/libexpat/pull/550	Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00007.html	Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202209-24	Third Party Advisory
https://security.netapp.com/advisory/ntap-20220217-0001/	Third Party Advisory
https://www.debian.org/security/2022/dsa-5073	Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	Third Party Advisory
https://www.tenable.com/security/tns-2022-05	Third Party Advisory

URL

CVE-2022-23852

Exploit prediction scoring system (EPSS) score for CVE-2022-23852

Common vulnerability scoring system (CVSS) metrics for CVE-2022-23852

Weakness enumeration for CVE-2022-23852

OS Trackers for CVE-2022-23852

Affected software / configurations for CVE-2022-23852

References for CVE-2022-23852