01 Record

CVE-2024-45490

An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.

CriticalPUBLISHEDCNA: mitre

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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02 Description

An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.68% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 76.5% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-08-30 00:00Z2 YR AGO

Last updated

2026-10-15 00:50Z14 DAYS AGO

Reserved

2024-08-30

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-190Integer Overflow or WraparoundBase

Data version

5.2

Document digest

7f01579bdd7d8f923d508a20c807612a2abaa25fa4eeeb9ed558b536817e20bd

05 Affected products

VendorProductVersionsPlatforms

libexpat_projectlibexpat0 to < 2.6.3—

06 References

github.comhttps://github.com/libexpat/libexpat/pull/890
github.comhttps://github.com/libexpat/libexpat/issues/887
security.netapp.comhttps://security.netapp.com/advisory/ntap-20241018-0004/
seclists.orghttp://seclists.org/fulldisclosure/2024/Dec/12
seclists.orghttp://seclists.org/fulldisclosure/2024/Dec/10
seclists.orghttp://seclists.org/fulldisclosure/2024/Dec/8
seclists.orghttp://seclists.org/fulldisclosure/2024/Dec/7
seclists.orghttp://seclists.org/fulldisclosure/2024/Dec/6
lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/09/msg00036.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-613116.html

07 Fixed in

AlmaLinux 8

expat
Fixed in 2.2.5-15.el8_10
expat-devel
Fixed in 2.2.5-15.el8_10

AlmaLinux 9

expat
Fixed in 2.5.0-2.el9_4.1
expat-devel
Fixed in 2.5.0-2.el9_4.1

CloudLinux 8

expat
Fixed in 2.2.5-15.el8_10
expat-devel
Fixed in 2.2.5-15.el8_10

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

CloudLinux 9

expat
Fixed in 2.5.0-2.el9_4.1
expat-devel
Fixed in 2.5.0-2.el9_4.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Debian 12

expat
Fixed in 2.5.0-1+deb12u1
libxmltok
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

expat
Fixed in 2.6.2-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

expat
Fixed in 2.6.2-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.