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Noroxi
CVE-2024-45490· NVD / CVE Program· CNA mitre

An issue was discovered in libexpat before 2.6.3.

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.6% (FIRST EPSS); higher than 76.7% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: expat (AlmaLinux:8) 2.2.5-15.el8_10; expat-devel (AlmaLinux:8) 2.2.5-15.el8_10; expat (AlmaLinux:9) 2.5.0-2.el9_4.1.

Low priority for now. Upgrade to expat (AlmaLinux:8) 2.2.5-15.el8_10; expat-devel (AlmaLinux:8) 2.2.5-15.el8_10; expat (AlmaLinux:9) 2.5.0-2.el9_4.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Aug 29, 2024
Updated
Oct 15, 2026
EPSS
1.6% · 76th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-45490

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
libexpat projectlibexpat

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • libexpat project libexpatbefore 2.6.3

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8expatbefore 2.2.5-15.el8_102.2.5-15.el8_10
AlmaLinux:8expat-develbefore 2.2.5-15.el8_102.2.5-15.el8_10
AlmaLinux:9expatbefore 2.5.0-2.el9_4.12.5.0-2.el9_4.1
AlmaLinux:9expat-develbefore 2.5.0-2.el9_4.12.5.0-2.el9_4.1
Alpine:v3.17expatbefore 2.6.3-r02.6.3-r0
Debian:11expatbefore 2.2.10-2+deb11u62.2.10-2+deb11u6
Debian:12expatbefore 2.5.0-1+deb12u12.5.0-1+deb12u1
Debian:12libxmltokfrom 0—
Debian:13expatbefore 2.6.2-22.6.2-2
openSUSE:Tumbleweedexpatbefore 2.6.3-1.12.6.3-1.1
openSUSE:Tumbleweedmozjs115before 115.4.0-5.1115.4.0-5.1
openSUSE:Tumbleweedmozjs128before 128.2.0-2.1128.2.0-2.1
openSUSE:Tumbleweedmozjs78before 78.15.0-5.178.15.0-5.1
openSUSE:Tumbleweedx3270before 4.3-4.14.3-4.1
Red Hat:enterprise_linux:8::baseosexpatbefore 0:2.2.5-15.el8_100:2.2.5-15.el8_10
Red Hat:enterprise_linux:8::baseosexpat-debuginfobefore 0:2.2.5-15.el8_100:2.2.5-15.el8_10
Red Hat:enterprise_linux:8::baseosexpat-debugsourcebefore 0:2.2.5-15.el8_100:2.2.5-15.el8_10
Red Hat:enterprise_linux:8::baseosexpat-develbefore 0:2.2.5-15.el8_100:2.2.5-15.el8_10
Red Hat:enterprise_linux:9::appstreamexpat-debuginfobefore 0:2.5.0-2.el9_4.10:2.5.0-2.el9_4.1
Red Hat:enterprise_linux:9::appstreamexpat-debugsourcebefore 0:2.5.0-2.el9_4.10:2.5.0-2.el9_4.1
Red Hat:enterprise_linux:9::appstreamexpat-develbefore 0:2.5.0-2.el9_4.10:2.5.0-2.el9_4.1
Red Hat:enterprise_linux:9::baseosexpatbefore 0:2.5.0-2.el9_4.10:2.5.0-2.el9_4.1
Rocky Linux:8expatbefore 0:2.2.5-15.el8_100:2.2.5-15.el8_10
Rocky Linux:9expatbefore 0:2.5.0-2.el9_4.10:2.5.0-2.el9_4.1

+15

Same product

libexpat project: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-25236xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.
    50Plan
  • CVE-2022-23852Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero XML_CONTEXT_BYTES.
    41Plan
  • CVE-2022-22822addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
    41Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-52426Feb 4, 2024 · libexpat through 2.5.0 allows recursive XML Entity Expansion if XML_DTD is undefined at compile time.
    22Monitor
  • ← EarlierCVE-2024-28757Mar 10, 2024 · libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityP
    31Monitor
  • Later →CVE-2024-45491Aug 29, 2024 · An issue was discovered in libexpat before 2.6.3.
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:expat2.5.0-2.el9_4.1 · AlmaLinux:9Package registry (OSV)
almalinux:expat-devel2.5.0-2.el9_4.1 · AlmaLinux:9Package registry (OSV)
alpine:expat2.6.3-r0 · Alpine:v3.17Package registry (OSV)
debian:expat2.5.0-1+deb12u1 · Debian:12Package registry (OSV)
opensuse:expat2.4.4-150400.3.22.1 · openSUSE:Leap Micro 5.5Package registry (OSV)
opensuse:mozjs115115.4.0-150600.3.3.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:mozjs128128.2.0-2.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:mozjs5252.6.0-150000.3.9.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:mozjs6060.9.0-150200.6.8.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:mozjs7878.15.0-150400.3.6.2 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:x32704.3-4.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:expat0:2.5.0-2.el9_4.1 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:expat-debuginfo0:2.5.0-2.el9_4.1 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:expat-debugsource0:2.5.0-2.el9_4.1 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:expat-devel0:2.5.0-2.el9_4.1 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:expat0:2.5.0-2.el9_4.1 · Rocky Linux:9Package registry (OSV)
suse:expat2.1.0-21.37.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:expat2.4.4-150400.3.22.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:mozjs115115.4.0-150600.3.3.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP6Package registry (OSV)
suse:mozjs5252.6.0-150000.3.9.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7Package registry (OSV)
suse:mozjs6060.9.0-150200.6.8.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:mozjs7878.15.0-150400.3.6.2 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-611 · Improper Restriction of XML External Entity Reference

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records