Sanic is an opensource python web server/framework. Prior to version 24.12.1, and in version 25.12.0, the HTTP/1.1 response pipeline in sanic/response/types.py serializes response header names and values without rejecting carriage-return or line-feed characters. Applications that place attacker-controlled data in response.headers, file(..., filename=...), or cookie path and domain attributes can therefore emit injected headers and may split responses. Depending on application and proxy behavior, this can enable session fixation through injected cookies, cache poisoning, or security-header corruption. This issue is fixed in versions 24.12.1 and 25.12.1.
CVE-2026-85077
HIGHPre-NVD 8.28.2—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 80% 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
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.2
- EG Score
- 8.2(medium)
- EG Risk
- 42(Track)EG Risk 42/100SSVC: 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 computedSeverity82% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 20%
- KEV
- Not listed
Published
September 17, 2026
Last Modified
September 17, 2026
Advisory Details (8)
Auto-updated Sep 17, 2026Patch 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 9a95bb1c1875 (sanic-org/sanic)
Fix landed in sanic-org/sanic commit 9a95bb1c1875 — awaiting tagged release
https://github.com/sanic-org/sanic/commit/9a95bb1c187558949606b915f5162c15f2db781bgithub_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
HTTP response header injection via missing CR/LF validation in Sanic HTTP/1.1 responses · Advisory · sanic-org/sanic · GitHub
https://github.com/sanic-org/sanic/security/advisories/GHSA-m64h-22vf-48wmWeakness 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.
- 2026-09-19 01:55 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescore
- 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-2026-85077?
CVE-2026-85077 is a high vulnerability published on September 17, 2026. Sanic is an opensource python web server/framework. Prior to version 24.12.1, and in version 25.12.0, the HTTP/1.1 response pipeline in sanic/response/types.py serializes response header names and values without rejecting carriage-return or line-feed characters. Applications that place…
When was CVE-2026-85077 disclosed?
CVE-2026-85077 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-2026-85077 actively exploited?
CVE-2026-85077 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 80.2% of all scored CVEs.
What is the CVSS score of CVE-2026-85077?
CVE-2026-85077 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-85077?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85077, 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-2026-85077
Is Your Infrastructure Affected by CVE-2026-85077?
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