Vector is a high-performance observability data pipeline. From 0.15.0 until 0.57.0, the logstash source feeds each decompressed frame back into its decoder without limiting nested compression depth. An unauthenticated remote peer that can reach the default 0.0.0.0:5044 listener can send many nested compressed frames, causing recursive decoding that exhausts the worker thread stack and aborts the process. The same nested construction amplifies decompressed input, and process termination can halt log ingestion for every tenant on a shared pipeline. This issue is fixed in version 0.57.0.
CVE-2026-77620
HIGHPre-NVD 8.78.7Trending — 3 sources updated this week
EchelonGraph scoreLOW confidence
This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: secondary
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.7Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.7
- EG Score
- 8.7(low)
- EG Risk
- 54(Track)EG Risk 54/100SSVC: 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 computedSeverity87% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 43%
- KEV
- Not listed
Published
September 22, 2026
Last Modified
September 22, 2026
Advisory Details (4)
Auto-updated Sep 22, 2026Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available
v0.57.0
Patch available: vectordotdev/vector v0.57.0
https://github.com/vectordotdev/vector/releases/tag/v0.57.0github_commit
commit 57fed991083c (vectordotdev/vector)
Fix landed in vectordotdev/vector commit 57fed991083c — awaiting tagged release
https://github.com/vectordotdev/vector/commit/57fed991083c9a43d5fda2d5b3bf4718aedf6526github_pr
fix(logstash source): reject nested compressed frames to prevent stack exhaustion
Fix merged in vectordotdev/vector PR #25825 on 2026-07-13 — awaiting tagged release
https://github.com/vectordotdev/vector/pull/25825github Patch Available
Unauthenticated denial of service in the `logstash` source via nested compressed frames (stack exhaustion and decompression amplification). · Advisory · vectordotdev/vector · GitHub
https://github.com/vectordotdev/vector/security/advisories/GHSA-qp6f-fpfx-4gg6Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 5× in last 7d / 5× 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.
- 2026-09-23 17:54 UTCEPSS rescore
- 2026-09-22 16:20 UTCEG score recompute
- 2026-09-22 15:45 UTCEG score recompute
- 2026-09-22 15:30 UTCEG score recompute
- 2026-09-22 15:29 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-77620?
CVE-2026-77620 is a high vulnerability published on September 22, 2026. Vector is a high-performance observability data pipeline. From 0.15.0 until 0.57.0, the logstash source feeds each decompressed frame back into its decoder without limiting nested compression depth. An unauthenticated remote peer that can reach the default 0.0.0.0:5044 listener can send many nested…
When was CVE-2026-77620 disclosed?
CVE-2026-77620 was first published in the National Vulnerability Database on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77620 actively exploited?
CVE-2026-77620 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 56.6% of all scored CVEs.
What is the CVSS score of CVE-2026-77620?
CVE-2026-77620 has a CVSS v3 base score of 8.7 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-77620?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77620, 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
Explore the affected products and dependency analysis for CVE-2026-77620
Is Your Infrastructure Affected by CVE-2026-77620?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.