Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's optional oghttp2 upstream HTTP/2 codec accepts a response trailer HEADERS frame without END_STREAM. Envoy completes and deferred-deletes the ActiveRequest while oghttp2 keeps the stream open, leaving ClientStreamImpl with a dangling response_decoder_ reference. A later frame on the stream can dispatch through the freed object and crash the process. The relevant scope boundary is that the default nghttp2 codec rejects the malformed trailers, and the trigger is upstream-only with oghttp2 enabled. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.
CVE-2026-73513
HIGHPre-NVD 7.57.5—Trending — 4 sources updated this week
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7%, top 48% 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
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
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EG Risk
- 39(Track)EG Risk 39/100SSVC: 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 computedSeverity75% × 45%Exploitation1% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 52%
- KEV
- Not listed
Published
September 21, 2026
Last Modified
September 23, 2026
Advisory Details (8)
Auto-updated Sep 21, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github_release Patch Available
v1.39.1
Patch available: envoyproxy/envoy v1.39.1
https://github.com/envoyproxy/envoy/releases/tag/v1.39.1github_release Patch Available
v1.38.4
Patch available: envoyproxy/envoy v1.38.4
https://github.com/envoyproxy/envoy/releases/tag/v1.38.4github_release Patch Available
v1.37.6
Patch available: envoyproxy/envoy v1.37.6
https://github.com/envoyproxy/envoy/releases/tag/v1.37.6github_commit
commit e6963c6b64cd (envoyproxy/envoy)
Fix landed in envoyproxy/envoy commit e6963c6b64cd — awaiting tagged release
https://github.com/envoyproxy/envoy/commit/e6963c6b64cd62aa8e078ef17c76052b6e33e82bgithub_commit
commit c4610b6c85d7 (envoyproxy/envoy)
Fix landed in envoyproxy/envoy commit c4610b6c85d7 — awaiting tagged release
https://github.com/envoyproxy/envoy/commit/c4610b6c85d72ed01e014c2a1aba2934a2b774e9github_commit
commit 3df69eeee220 (envoyproxy/envoy)
Fix landed in envoyproxy/envoy commit 3df69eeee220 — awaiting tagged release
https://github.com/envoyproxy/envoy/commit/3df69eeee220d6a4088cfdd3be79b55e2e6d3514github_commit
commit 0d33268d7d8c (envoyproxy/envoy)
Fix landed in envoyproxy/envoy commit 0d33268d7d8c — awaiting tagged release
https://github.com/envoyproxy/envoy/commit/0d33268d7d8cdc5c8ffef462e0cceefa56156b72github Patch Available🟡 PoC Available
oghttp2 upstream trailers incorrect handling · Advisory · envoyproxy/envoy · GitHub
https://github.com/envoyproxy/envoy/security/advisories/GHSA-jjmm-fw8p-crpwVendor Advisories for CVE-2026-73513(6)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:65121Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.4.2
- RHSA-2026:65115Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.3.7
- RHSA-2026:65113Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.2.9
- RHSA-2026:65112Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.1.12
- RHSA-2026:65106Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.0.15
- GCP-2026-057Google Cloud Security Bulletins
GCP-2026-057 — Published: 2026-08-26Description Description Severity Notes A series of vulnerabilities were discovered in Envoy Proxy. For instructions…
Patch Availability(5)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | openshift-service-mesh/istio-proxyv2-rhel9:1788327866 | 2026-09-08 | redhat |
| redhat | openshift-service-mesh/istio-proxyv2-rhel9:1788333924 | 2026-09-08 | redhat |
| redhat | openshift-service-mesh/istio-proxyv2-rhel9:1788296328 | 2026-09-08 | redhat |
| redhat | openshift-service-mesh/istio-proxyv2-rhel9:1788294715 | 2026-09-08 | redhat |
| redhat | openshift-service-mesh/istio-proxyv2-rhel9:1788329366 | 2026-09-08 | redhat |
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.
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 12× in last 7d / 12× 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 18:26 UTCEG score recompute
- 2026-09-23 18:26 UTCVendor advisory
- 2026-09-23 17:54 UTCEPSS rescore
- 2026-09-23 09:19 UTCVendor advisory
- 2026-09-22 20:59 UTCEG score recompute
- 2026-09-22 20:59 UTCVendor advisory
- 2026-09-22 08:39 UTCVendor advisory
- 2026-09-21 20:18 UTCEG score recompute
- 2026-09-21 20:18 UTCVendor advisory
- 2026-09-21 19:45 UTCEG score recompute
- 2026-09-21 19:45 UTCVendor advisory
- 2026-09-21 19:45 UTCMITRE cvelistV5first tracked
Related CVEs(same vendor + same CWE)
Same vendor
10 shownredhat:RHSA-2026:65106
Same CWE
10 shownCWE-20 · CWE-416
Frequently asked(5)
What is CVE-2026-73513?
CVE-2026-73513 is a high vulnerability published on September 21, 2026. Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's optional oghttp2 upstream HTTP/2 codec accepts a response trailer HEADERS frame without ENDSTREAM. Envoy completes and deferred-deletes the ActiveRequest…
When was CVE-2026-73513 disclosed?
CVE-2026-73513 was first published in the National Vulnerability Database on September 21, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73513 actively exploited?
CVE-2026-73513 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 47.6% of all scored CVEs.
What is the CVSS score of CVE-2026-73513?
CVE-2026-73513 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-73513?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73513, 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-2026-73513
Is Your Infrastructure Affected by CVE-2026-73513?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.