Sanic is an opensource python web server/framework. In version 25.12.0, Sanic's core HTTP/1.1 chunked-body handling does not fully consume the trailer-part after the terminating zero chunk before reusing the keep-alive connection buffer. A remote unauthenticated client can place attacker-controlled bytes in that trailer region, causing Sanic to parse and route them as a hidden second request after the outer request. This breaks HTTP request-boundary integrity and can provide a request-smuggling primitive when Sanic is deployed behind intermediaries. This issue is fixed in version 25.12.1.
CVE-2026-85078
MEDIUMPre-NVD 6.56.5—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 77% 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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EG Risk
- 44(Track)EG Risk 44/100SSVC: 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 computedSeverity65% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 23%
- KEV
- Not listed
Published
September 17, 2026
Last Modified
September 17, 2026
Advisory Details (8)
Auto-updated Sep 17, 2026🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available
Version 25.12.1
Patch available: sanic-org/sanic v25.12.1
https://github.com/sanic-org/sanic/releases/tag/v25.12.1github_release Patch Available
Version 24.12.1
Patch available: sanic-org/sanic v24.12.1
https://github.com/sanic-org/sanic/releases/tag/v24.12.1github_commit Patch Available
commit a332796506c7 (sanic-org/sanic)
Patch available: sanic-org/sanic v25.12.1 (contains commit a332796506c7)
https://github.com/sanic-org/sanic/commit/a332796506c7c588b6930b02a8886e43eb8ea8d6github_commit
commit 69a10d3b06ba (sanic-org/sanic)
Fix landed in sanic-org/sanic commit 69a10d3b06ba — awaiting tagged release
https://github.com/sanic-org/sanic/commit/69a10d3b06babaa9e5f6d1af577364e9e53b6deagithub_commit Patch Available
commit 47349d689d65 (sanic-org/sanic)
Patch available: sanic-org/sanic v24.12.1 (contains commit 47349d689d65)
https://github.com/sanic-org/sanic/commit/47349d689d65fa1907977ac100e867894aeafb22github_pr Patch Available
v24 LTS security patch
Patch available: sanic-org/sanic v24.12.1 (PR #3165 merged 2026-05-31)
https://github.com/sanic-org/sanic/pull/3165github_pr Patch Available
v25 LTS security patch
Patch available: sanic-org/sanic v25.12.1 (PR #3164 merged 2026-05-31)
https://github.com/sanic-org/sanic/pull/3164github Patch Available🟡 PoC Available
sanic chunked trailer request smuggling allows hidden second request execution · Advisory · sanic-org/sanic · GitHub
https://github.com/sanic-org/sanic/security/advisories/GHSA-wmj6-g64g-j7q5Vendor Advisories for CVE-2026-85078(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| sanic | 0.1.0 ... 24.6.0 (80 versions) | 24.12.1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× 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.
- 2026-09-18 21:13 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-17 20:27 UTCEG score recompute
- 2026-09-17 19:30 UTCEG score recompute
- 2026-09-17 15:23 UTCEG score recompute
- 2026-09-17 14:34 UTCEG score recompute
- 2026-09-17 14:34 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-85078?
CVE-2026-85078 is a medium vulnerability published on September 17, 2026. Sanic is an opensource python web server/framework. In version 25.12.0, Sanic's core HTTP/1.1 chunked-body handling does not fully consume the trailer-part after the terminating zero chunk before reusing the keep-alive connection buffer. A remote unauthenticated client can place attacker-controlled…
When was CVE-2026-85078 disclosed?
CVE-2026-85078 was first published in the National Vulnerability Database on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85078 actively exploited?
CVE-2026-85078 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 77.5% of all scored CVEs.
What is the CVSS score of CVE-2026-85078?
CVE-2026-85078 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-85078?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85078, 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
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-85078
Is Your Infrastructure Affected by CVE-2026-85078?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.