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Noroxi
NVD / CVE Program· CNA redhat

CVE-2024-8176: Libexpat: expat: improper restriction of xml entity expansion depth in libexpat

Noroxi assessment

Priority: Monitor (action score 30/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.3% (FIRST EPSS); higher than 71.4% 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: github.com/libexpat/libexpat/ libexpat 2.7.0; azl3 expat 2.6.4-1 on Azure Linux 3.0 2.6.4-1; cbl2 expat 2.6.4-1 on CBL Mariner 2.0 2.6.4-1.

Low priority for now. Upgrade to github.com/libexpat/libexpat/ libexpat 2.7.0; azl3 expat 2.6.4-1 on Azure Linux 3.0 2.6.4-1; cbl2 expat 2.6.4-1 on CBL Mariner 2.0 2.6.4-1 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

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.

HighCVSS 7.5 · v3.1—Proof of concept Fix available
Published
Mar 14, 2025
Updated
Oct 21, 2026
EPSS
1.3% · 71th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

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

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When you'll hear from us

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  • 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.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • github.com/libexpat/libexpat/ libexpat

    • before 2.7.0affected · semver

  • Red Hat DevWorkspace Operator 0.33

    • 0.33-1744075017 and laternot affected · rpm

  • Red Hat Red Hat Discovery 1.14

    • 1.14.3-1748529279 and laternot affected · rpm
    • 1.14.2-1748467619 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10

    • 0:2.7.1-1.el10_0 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown
    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown
    • all versionsunknown
    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • 0:2.2.5-17.el8_10 and laternot affected · rpm
    • 0:1.51.0-11.el8_10 and laternot affected · rpm
    • all versionsaffected
    • all versionsunknown
    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support

    • 0:2.2.10-1.el8_2 and laternot affected · rpm
    • 0:1.51.0-5.el8_2.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

    • 0:2.2.10-1.el8_4 and laternot affected · rpm
    • 0:1.51.0-5.el8_4.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

    • 0:2.2.10-1.el8_4 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service

    • 0:1.51.0-5.el8_4.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions

    • 0:1.51.0-5.el8_4.2 and laternot affected · rpm

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10expatbefore 2.7.1-1.el10_02.7.1-1.el10_0
AlmaLinux:10expat-develbefore 2.7.1-1.el10_02.7.1-1.el10_0
AlmaLinux:8expatbefore 2.2.5-17.el8_102.2.5-17.el8_10
AlmaLinux:8expat-develbefore 2.2.5-17.el8_102.2.5-17.el8_10
AlmaLinux:8xmlrpc-cbefore 1.51.0-11.el8_101.51.0-11.el8_10
AlmaLinux:8xmlrpc-c-c++before 1.51.0-11.el8_101.51.0-11.el8_10
AlmaLinux:8xmlrpc-c-clientbefore 1.51.0-11.el8_101.51.0-11.el8_10
AlmaLinux:8xmlrpc-c-client++before 1.51.0-11.el8_101.51.0-11.el8_10
AlmaLinux:8xmlrpc-c-develbefore 1.51.0-11.el8_101.51.0-11.el8_10
AlmaLinux:9expatbefore 2.5.0-5.el9_62.5.0-5.el9_6
AlmaLinux:9expatbefore 2.5.0-3.el9_5.32.5.0-3.el9_5.3
AlmaLinux:9expat-develbefore 2.5.0-5.el9_62.5.0-5.el9_6
AlmaLinux:9expat-develbefore 2.5.0-3.el9_5.32.5.0-3.el9_5.3
Alpine:v3.18expatbefore 2.7.0-r02.7.0-r0
Debian:12expatbefore 2.5.0-1+deb12u22.5.0-1+deb12u2
Debian:12libxmltokfrom 0—
Debian:13expatbefore 2.7.0-12.7.0-1
openSUSE:Leap 15.6expatbefore 2.7.1-150400.3.28.12.7.1-150400.3.28.1
openSUSE:Tumbleweedexpatbefore 2.7.1-1.12.7.1-1.1
Red Hat:enterprise_linux:10.0expatbefore 0:2.7.1-1.el10_00:2.7.1-1.el10_0
Red Hat:enterprise_linux:10.0expat-debuginfobefore 0:2.7.1-1.el10_00:2.7.1-1.el10_0
Red Hat:enterprise_linux:10.0expat-debugsourcebefore 0:2.7.1-1.el10_00:2.7.1-1.el10_0
Red Hat:enterprise_linux:10.0expat-develbefore 0:2.7.1-1.el10_00:2.7.1-1.el10_0
Red Hat:enterprise_linux:8::baseosexpatbefore 0:2.2.5-17.el8_100:2.2.5-17.el8_10

+77

Same product

red hat: all records

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Published before and after this one in the same product

  • ← EarlierCVE-2025-1118Feb 19, 2025 · Grub2: commands/dump: the dump command is not in lockdown when secure boot is enabled
    17Monitor
  • ← EarlierCVE-2025-0677Feb 19, 2025 · Grub2: ufs: integer overflow may lead to heap based out-of-bounds write when handling symlinks
    25Monitor
  • Later →CVE-2025-1057Mar 15, 2025 · Keylime: keylime registrar dos due to incompatible database entry handling
    17Monitor

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
github.com/libexpat/libexpat/ libexpat2.7.0Vendor (CNA)
azl3 expat 2.6.4-1 on Azure Linux 3.02.6.4-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 expat 2.6.4-1 on CBL Mariner 2.02.6.4-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 expat 2.6.4-1 on CBL-Mariner 2.02.6.4-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:expat2.5.0-3.el9_5.3 · AlmaLinux:9Package registry (OSV)
almalinux:expat-devel2.5.0-3.el9_5.3 · AlmaLinux:9Package registry (OSV)
almalinux:xmlrpc-c1.51.0-11.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:xmlrpc-c-c++1.51.0-11.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:xmlrpc-c-client1.51.0-11.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:xmlrpc-c-client++1.51.0-11.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:xmlrpc-c-devel1.51.0-11.el8_10 · AlmaLinux:8Package registry (OSV)
alpine:expat2.7.0-r0 · Alpine:v3.18Package registry (OSV)
debian:expat2.5.0-1+deb12u2 · Debian:12Package registry (OSV)
opensuse:expat2.7.1-150400.3.28.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:expat0:2.5.0-2.el9_4.3 · Red Hat:rhel_eus:9.4::baseosPackage registry (OSV)
red hat:expat-debuginfo0:2.5.0-3.el9_5.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:expat-debugsource0:2.5.0-3.el9_5.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:expat-devel0:2.5.0-3.el9_5.3 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:xmlrpc-c0:1.51.0-11.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:xmlrpc-c-apps-debuginfo0:1.51.0-11.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:xmlrpc-c-c++-debuginfo0:1.51.0-11.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:xmlrpc-c-client0:1.51.0-11.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:xmlrpc-c-client-debuginfo0:1.51.0-11.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:xmlrpc-c-client++-debuginfo0:1.51.0-11.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:xmlrpc-c-debuginfo0:1.51.0-11.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:xmlrpc-c-debugsource0:1.51.0-11.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
rocky linux:expat0:2.5.0-3.el9_5.3 · Rocky Linux:9Package registry (OSV)
rocky linux:xmlrpc-c0:1.51.0-11.el8_10 · Rocky Linux:8Package registry (OSV)
suse:expat2.7.1-150400.3.28.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:expat2.7.1-150700.3.3.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02025-04-02

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.

  1. Published
  2. First PoC+19 d
  3. TodayOct 29, 2026+594 d
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.

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-674 · Uncontrolled Recursion

CVSS vector

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

nvd-secondary

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 (19 more)

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

All records