Resource allocation without limits in libexpat
Priority LOW 36CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 50 fixed, 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-770.
Summary
libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0138 72nd percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Partial libexpat (libexpat project): 2.7.2Red Hat: 53 advisoriesRed Hat: 50 fixed, 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| libexpat project | libexpat | before 2.7.2 | 2.7.2 | Patch available | CNA |
- libexpat Vendorlibexpat project Affected before 2.7.2 Fixed in 2.7.2 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* | before 2.7.2 | Vulnerable | libexpat project |
- cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* Versions before 2.7.2 Vulnerable ·libexpat project
Remediation
- Fix · CNA libexpat (libexpat project) Fixed in 2.7.2
Red Hat 53 advisories
- RHSA-2026:58981 Released 2026-08-24 · Red Hat rating CriticalRed Hat Update Infrastructure 5.3 Technology Preview security update
- Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-tp-rhel9, registry.redhat.io/rhui5/installer-tp-rhel9, registry.redhat.io/rhui5/rhua-tp-rhel9
- RHSA-2026:21275 Released 2026-05-27 · Red Hat rating CriticalRed Hat Update Infrastructure 5.1 security update
- Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
- RHSA-2026:19177 Released 2026-05-19 · Red Hat rating Importantpython3.12 security update
- Red Hat Enterprise Linux AppStream (v. 9) python3.12-3.12.13-2.el9_8, python3.12-devel-3.12.13-2.el9_8, python3.12-libs-3.12.13-2.el9_8 +1
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) python3.12-3.12.13-2.el9_8, python3.12-debug-3.12.13-2.el9_8, python3.12-idle-3.12.13-2.el9_8 +2
Show 50 more Red Hat advisories
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- RHSA-2026:10950 Released 2026-04-27 · Red Hat rating Importantpython3.12 security update
- Red Hat Enterprise Linux AppStream (v. 8) python3.12-3.12.13-2.el8_10, python3.12-devel-3.12.13-2.el8_10, python3.12-libs-3.12.13-2.el8_10 +2
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- RHSA-2025:22871 Released 2025-12-09 · Red Hat rating Importantexpat security update
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- RHSA-2025:22175 Released 2025-11-26 · Red Hat rating Importantexpat security update
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- Red Hat Enterprise Linux BaseOS (v. 9) expat-2.5.0-5.el9_7.1
- RHSA-2025:22033 Released 2025-11-25 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux BaseOS EUS (v.9.4) expat-2.5.0-2.el9_4.3
- RHSA-2025:22034 Released 2025-11-25 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux BaseOS E4S (v.9.2) expat-2.5.0-1.el9_2.3
- RHSA-2025:22035 Released 2025-11-25 · Red Hat rating Importantexpat security update
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- RHSA-2025:21974 Released 2025-11-24 · Red Hat rating Importantmingw-expat security update
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- RHSA-2025:21776 Released 2025-11-19 · Red Hat rating Importantexpat security update
- Red Hat Enterprise Linux BaseOS (v. 8) expat-2.5.0-1.el8_10, expat-devel-2.5.0-1.el8_10
- RHSA-2025:21773 Released 2025-11-19 · Red Hat rating Importantexpat security update
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- Red Hat Enterprise Linux BaseOS EUS (v.9.6) expat-2.5.0-5.el9_6.1
- RHSA-2025:21030 Released 2025-11-11 · Red Hat rating Importantexpat security update
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Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 9 | Affected | No fix planned: Will not fix |
| 8Base-Openshift-Serverless-1.36 | Fixed | RHSA-2026:0934 |
| Red Hat AI Inference Server 3.2 | Fixed | RHSA-2025:23078, RHSA-2025:23079, RHSA-2025:23080, RHSA-2025:23202, RHSA-2025:23204, RHSA-2025:23205, RHSA-2025:23209, RHSA-2025:23449, RHSA-2026:3461, RHSA-2026:3462 |
| Red Hat Advanced Cluster Security 4.7 | Fixed | RHSA-2025:23248 |
| Red Hat Advanced Cluster Security 4.8 | Fixed | RHSA-2025:23550 |
| Red Hat Ceph Storage 8 | Fixed | RHSA-2025:23227, RHSA-2026:1652 |
| Red Hat Discovery 2 | Fixed | RHSA-2026:0414 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2025:19403, RHSA-2025:21030, RHSA-2026:19064 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2026:10950 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2025:22175, RHSA-2026:19177 |
| Red Hat Enterprise Linux AppStream AUS (v. 8.2) | Fixed | RHSA-2026:0078 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2026:0077 |
| Red Hat Enterprise Linux AppStream AUS (v.8.6) | Fixed | RHSA-2026:0076 |
| Red Hat Enterprise Linux AppStream E4S (v.8.6) | Fixed | RHSA-2026:0076 |
| Red Hat Enterprise Linux AppStream E4S (v.8.8) | Fixed | RHSA-2026:0001 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2025:21773 |
| Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:0077 |
| Red Hat Enterprise Linux AppStream TUS (v.8.6) | Fixed | RHSA-2026:0076 |
| Red Hat Enterprise Linux AppStream TUS (v.8.8) | Fixed | RHSA-2026:0001 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2025:19403, RHSA-2025:21030, RHSA-2026:19064 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2025:21776 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2025:22175 |
| Red Hat Enterprise Linux BaseOS AUS (v. 8.2) | Fixed | RHSA-2025:22871 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2025:22785 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2025:22842 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2025:22842 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2025:22607 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.0) | Fixed | RHSA-2025:22035 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2025:22034 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.4) | Fixed | RHSA-2025:22033 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Fixed | RHSA-2025:21773 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2025:22785 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2025:22842 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2025:22607 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2025:21974, RHSA-2026:10950, RHSA-2026:3407 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:19064 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:19177 |
| Red Hat Hardened Images | Fixed | RHSA-2026:5396 |
| Red Hat JBoss Core Services 2.4.62.SP2 | Fixed | RHSA-2025:19020 |
| Red Hat OpenShift Container Platform 4.12 | Fixed | RHSA-2026:0316 |
| Red Hat OpenShift Container Platform 4.13 | Fixed | RHSA-2026:0677 |
| Red Hat OpenShift Container Platform 4.14 | Fixed | RHSA-2026:0996 |
| Red Hat OpenShift Container Platform 4.15 | Fixed | RHSA-2026:1541 |
| Red Hat OpenShift Container Platform 4.16 | Fixed | RHSA-2026:0326 |
| Red Hat OpenShift Container Platform 4.17 | Fixed | RHSA-2026:0702 |
| Red Hat OpenShift Container Platform 4.18 | Fixed | RHSA-2026:0332 |
| Red Hat OpenShift Container Platform 4.19 | Fixed | RHSA-2026:0674 |
| Red Hat OpenShift Container Platform 4.20 | Fixed | RHSA-2026:0420 |
| Red Hat OpenShift distributed tracing 3.8.0 | Fixed | RHSA-2025:22618 |
| Red Hat Quay 3.16 | Fixed | RHSA-2026:0518 |
| Red Hat Update Infrastructure 5 | Fixed | RHSA-2025:22935, RHSA-2026:21275, RHSA-2026:58981 |
Not affected: 22 products
- Red Hat Advanced Cluster Security 4.7
- Red Hat Advanced Cluster Security 4.8
- Red Hat Ceph Storage 8
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux AppStream E4S (v.9.0)
- Red Hat Enterprise Linux AppStream E4S (v.9.2)
- Red Hat Enterprise Linux AppStream EUS (v.9.4)
- Red Hat Enterprise Linux BaseOS AUS (v. 8.2)
- Red Hat Enterprise Linux BaseOS AUS (v.8.4)
- Red Hat Enterprise Linux BaseOS AUS (v.8.6)
- Red Hat Enterprise Linux BaseOS E4S (v.8.6)
- Red Hat Enterprise Linux BaseOS E4S (v.8.8)
- Red Hat Enterprise Linux BaseOS E4S (v.9.0)
- Red Hat Enterprise Linux BaseOS E4S (v.9.2)
- Red Hat Enterprise Linux BaseOS EUS (v.9.4)
- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
- Red Hat Enterprise Linux BaseOS TUS (v.8.6)
- Red Hat Enterprise Linux BaseOS TUS (v.8.8)
- Red Hat Quay 3.16
- Red Hat Update Infrastructure 5
Timeline
- 2026-10-02 Threatist record created from CVE-2025-59375
- 2026-10-03 Alias added: GHSA-vjqp-pjp6-xcxx
- 2026-10-09 Fix available: RHSA-2025:19020 · Red Hat
- 2026-10-09 Fix available: Red Hat JBoss Core Services 2.4.62.SP2 · Red Hat
References
Exploit 2
More libexpat project Libexpat vulnerabilities
- TI-2022-09008 In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames. CVSS 3.1CRITICAL 9.8
- TI-2026-79488 Billion laughs detection delay in libexpat enables denial of service CVSS 4.0HIGH 8.7
- TI-2022-08947 xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert… CVSS 3.1CRITICAL 9.8
- TI-2021-20962 In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the… CVSS 3.1HIGH 8.8
- TI-2021-21076 In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize. CVSS 3.1HIGH 8.1
- TI-2016-00645 Expat allows context-dependent attackers to cause a denial of service (crash) or possibly… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2025-59375 · CVE Program
- CVE-2025-59375 · NVD
- FIRST EPSS
- GHSA-vjqp-pjp6-xcxx · GitHub Advisory Database · CC BY 4.0
- CVE-2025-59375 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences