CVE-2026-78002

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript replace() function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 29, 2026

Advisory Details (3)

Auto-updated Aug 27, 2026
Patch available. Sources: redhat, github.
github Patch Available

RainerScript `replace()` heap buffer overflow · Advisory · rsyslog/rsyslog · GitHub

https://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3
redhat

2521135 – (CVE-2026-78002) CVE-2026-78002 rsyslog: rsyslog: Denial of service via heap buffer overflow in RainerScript replace() function

https://bugzilla.redhat.com/show_bug.cgi?id=2521135
redhat Patch Available

CVE-2026-78002 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-78002

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 10× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 23:26 UTCEG score recompute
  3. 2026-08-29 22:23 UTCEG score recompute
  4. 2026-08-29 05:58 UTCEG score recompute
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-27 20:27 UTCEG score recompute
  7. 2026-08-27 20:17 UTCEG score recompute
  8. 2026-08-27 17:24 UTCEG score recompute
  9. 2026-08-27 16:46 UTCEG score recompute
  10. 2026-08-27 16:43 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-78002?
CVE-2026-78002 is a high vulnerability published on August 27, 2026. A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript replace() function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory…
When was CVE-2026-78002 disclosed?
CVE-2026-78002 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on August 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78002 actively exploited?
CVE-2026-78002 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.7% of all scored CVEs.
What is the CVSS score of CVE-2026-78002?
CVE-2026-78002 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-78002?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78002, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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