Bug 2562538 (CVE-2026-117610)
| Summary: | CVE-2026-117610 expat: expat: Denial of Service via NULL pointer dereference in external entity parsing | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security DevOps Team <prodsec-dev> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | akhatavk, aos-team-art-private, asdas, dpaolell, gotiwari, jdelft, jhorak, jupierce, lgarciaa, mbiarnes, mvyas, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in expat. A remote attacker who controls input stream chunking can trigger a NULL pointer dereference by forcing an empty initial parse on an external entity subparser. Successful exploitation causes the application to crash, resulting in a Denial of Service (DoS).
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
OSIDB Bzimport
2026-10-28 02:32:21 UTC
Internal — CVSS v3.1 / rating rationale (CVE-2026-117610) Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H = 5.9 → Moderate NVD: 7.5 (AC:L). Metric notes: - AV:N — network-delivered XML possible. - AC:H — needs empty non-final first parse on external-entity subparser (stream chunking + external entities); not typical default RHEL XML usage. - C:N / I:N / A:H — NULL deref crash / DoS; no demonstrated C/I impact. Safeguards harden exploitation of memory bugs but do not stop this crash DoS. NVD ≥7 → affected products AFFECTED+DELEGATED; RHEL 6 AFFECTED+OOSS. |