CVE-2026-85078 json
sanic chunked trailer request smuggling allows hidden second request execution
published last mo. modified last mo. also EUVD-2026-81577 , GHSA-wmj6-g64g-j7q5 , PYSEC-2026-4162
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 44%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi sanic 24.12.1, 25.12.1
- sanic_project sanic 24.12.1, 25.12.1
- github.com/sanic-org/sanic@47349d6 commit
- github.com/sanic-org/sanic@69a10d3 commit
- github.com/sanic-org/sanic@a332796 commit
- github.com/sanic-org/sanic#3164 pull request
- github.com/sanic-org/sanic#3165 pull request
- github.com/sanic-org/sanic/releases/tag/v24.12.1 release
- github.com/sanic-org/sanic/releases/tag/v25.12.1 release
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Check with FencerVendor advisories
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red hat product security vex CVE-2026-85078 updated cvss 8.2
sanic: Sanic: Request smuggling via incomplete chunked-body handling
-
Red Hat OpenShift AI (RHOAI) rhai/guidellm-rhel9affected: workaround, no fix available
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.51% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | sanic | <24.12.1 >=25.12.0, <25.12.1 |
24.12.1 25.12.1 |
Affected products
- sanic-org sanic
Classification
- Weakness
-
- CWE-444 Inconsistent Interpretation of HTTP Requests
References
-
github.com
/sanic-org/sanic/pull/3164
web
-
github.com
/sanic-org/sanic/pull/3165
web
-
github.com
/sanic-org/sanic/commit/47349d689d65fa1907977ac100e867894aeafb22
web
-
github.com
/sanic-org/sanic/commit/69a10d3b06babaa9e5f6d1af577364e9e53b6dea
web
-
github.com
/sanic-org/sanic/commit/a332796506c7c588b6930b02a8886e43eb8ea8d6
web
-
github.com
/sanic-org/sanic/security/advisories/GHSA-wmj6-g64g-j7q5
web
-
github.com
/sanic-org/sanic/releases/tag/v24.12.1
web
-
github.com
/sanic-org/sanic/releases/tag/v25.12.1
web
-
github.com
/sanic-org/sanic
package
-
pypi.org
/project/sanic
package
-
github.com
/advisories/GHSA-wmj6-g64g-j7q5
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-85078
advisory
Sources
- CVE List CVE-2026-85078
- GitHub Advisory GHSA-wmj6-g64g-j7q5
- NVD CVE-2026-85078
- OSV PYSEC-2026-4162
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.