CVE-2026-78002

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.1% (64th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-67085 (ENISA EUVD)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.1%
EPSS %ILE
64th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
1.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-30). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 27, 2026

Last Modified

October 30, 2026

Advisory Details (3)

Auto-updated Aug 27, 2026
Patch available. Sources: redhat, github.
GitHub advisoryMentions a patch (unverified)

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

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

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
Red HatMentions a patch (unverified)

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

Patch Availability(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntursyslog-snmp (8.2312.0-3ubuntu9.4) @ noble2026-10-30ubuntu
redhatrsyslog-0:8.2310.0-4.el9_4.22026-10-26redhat
redhatrsyslog-0:8.2102.0-13.el8_8.12026-10-21redhat
redhatrsyslog-0:8.2102.0-113.el9_2.32026-10-20redhat
redhatrsyslog-0:8.2412.0-1.el9_6.22026-10-19redhat
redhatrsyslog-0:8.2412.0-1.el10_0.22026-10-12redhat
redhatrsyslog-0:8.2102.0-15.el8_10.32026-10-12redhat
redhatrhui5/haproxy-rhel9:17902419002026-09-24redhat
redhatrsyslog-0:8.2510.0-2.el9_8.22026-09-22redhat
redhatrsyslog-0:8.2510.0-5.el10_2.22026-09-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
rsyslog8.2302.0-1 ... 8.2608.0-4 (55 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
rsyslog8.2504.0-1, 8.2504.0-1+deb13u1
  • every version up to 8.2504.0-1+deb13u2: fixed in 8.2504.0-1+deb13u2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
rsyslog8.2504.0-1 ... 8.2608.0-3 (26 versions)
  • every version up to 8.2608.0-4: fixed in 8.2608.0-4
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 83× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 221 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 121 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-31 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  2. 2026-10-30 18:26 UTCEG score recompute
  3. 2026-10-30 18:26 UTCVendor advisory
  4. 2026-10-30 17:35 UTCEG score recompute
  5. 2026-10-30 17:35 UTCVendor advisory
  6. 2026-10-30 16:35 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  7. 2026-10-29 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  8. 2026-10-28 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  9. 2026-10-27 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  10. 2026-10-26 17:31 UTCEG score recompute
  11. 2026-10-26 17:31 UTCVendor advisory
  12. 2026-10-26 16:32 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  13. 2026-10-26 16:31 UTCEG score recompute
  14. 2026-10-26 16:31 UTCVendor advisory
  15. 2026-10-25 16:34 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  16. 2026-10-25 14:01 UTCEG score recompute
  17. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  18. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  19. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  20. 2026-10-21 21:27 UTCEG score recompute
  21. 2026-10-21 21:27 UTCVendor advisory
  22. 2026-10-21 21:04 UTCEG score recompute
  23. 2026-10-21 21:04 UTCVendor advisory
  24. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  25. 2026-10-20 22:27 UTCEG score recompute
Show 75 more
  1. 2026-10-20 22:27 UTCVendor advisory
  2. 2026-10-20 21:39 UTCEG score recompute
  3. 2026-10-20 21:39 UTCVendor advisory
  4. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  5. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  6. 2026-10-19 05:26 UTCEG score recompute
  7. 2026-10-19 05:26 UTCVendor advisory
  8. 2026-10-19 04:44 UTCEG score recompute
  9. 2026-10-19 04:44 UTCVendor advisory
  10. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  11. 2026-10-18 03:11 UTCEG score recompute
  12. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  13. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  14. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  15. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  16. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  17. 2026-10-12 20:26 UTCEG score recompute
  18. 2026-10-12 20:26 UTCVendor advisory
  19. 2026-10-12 20:02 UTCEG score recompute
  20. 2026-10-12 20:02 UTCVendor advisory
  21. 2026-10-12 18:26 UTCEG score recompute
  22. 2026-10-12 18:26 UTCVendor advisory
  23. 2026-10-12 17:33 UTCEG score recompute
  24. 2026-10-12 17:33 UTCVendor advisory
  25. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  26. 2026-10-12 15:37 UTCEG score recompute
  27. 2026-10-11 19:23 UTCEG score recompute
  28. 2026-10-11 16:39 UTCEG score recompute
  29. 2026-10-11 13:57 UTCEG score recompute
  30. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  31. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  32. 2026-10-10 12:59 UTCVendor advisory
  33. 2026-10-10 01:53 UTCEG score recompute
  34. 2026-10-10 01:53 UTCVendor advisory
  35. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  36. 2026-10-09 03:04 UTCEG score recompute
  37. 2026-10-09 03:04 UTCVendor advisory
  38. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  39. 2026-10-08 01:19 UTCEG score recompute
  40. 2026-10-08 01:19 UTCVendor advisory
  41. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  42. 2026-10-07 09:53 UTCVendor advisory
  43. 2026-10-06 22:42 UTCEG score recompute
  44. 2026-10-06 22:42 UTCVendor advisory
  45. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  46. 2026-10-06 11:47 UTCVendor advisory
  47. 2026-10-06 00:53 UTCEG score recompute
  48. 2026-10-06 00:53 UTCVendor advisory
  49. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  50. 2026-10-05 12:19 UTCVendor advisory
  51. 2026-10-05 01:23 UTCEG score recompute
  52. 2026-10-05 01:23 UTCVendor advisory
  53. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  54. 2026-10-04 13:55 UTCVendor advisory
  55. 2026-10-04 03:02 UTCVendor advisory
  56. 2026-10-03 16:03 UTCEG score recompute
  57. 2026-10-03 16:03 UTCVendor advisory
  58. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  59. 2026-10-03 04:38 UTCEG score recompute
  60. 2026-10-03 04:38 UTCVendor advisory
  61. 2026-10-02 17:42 UTCVendor advisory
  62. 2026-10-02 06:47 UTCVendor advisory
  63. 2026-10-01 19:53 UTCEG score recompute
  64. 2026-10-01 19:53 UTCVendor advisory
  65. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  66. 2026-10-01 06:53 UTCVendor advisory
  67. 2026-09-30 19:54 UTCEG score recompute
  68. 2026-09-30 19:54 UTCVendor advisory
  69. 2026-09-30 04:59 UTCEG score recompute
  70. 2026-09-30 04:59 UTCVendor advisory
  71. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  72. 2026-09-29 12:25 UTCVendor advisory
  73. 2026-09-29 01:31 UTCEG score recompute
  74. 2026-09-29 01:31 UTCVendor advisory
  75. 2026-09-28 14:38 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-78002?
CVE-2026-78002 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-78002 was made public on August 26, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on August 27, 2026. EchelonGraph's copy of the record carries a last-modified date of October 30, 2026; the record at its source may have been updated since.
Is CVE-2026-78002 actively exploited?
CVE-2026-78002 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (64th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-78002?
CVE-2026-78002 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-78002?
A fix for CVE-2026-78002 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-78002 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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