CVE-2026-66753

LOWPre-NVD 3.73.7—
EchelonGraph scoreHIGH confidence

Score 3.7 from GitHub Security Advisory published 2026-07-28. the CNA's CVSS baseline 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
3.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.7Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

tiny-http through 0.12.0 contains an HTTP header injection vulnerability that allows attackers to inject carriage return (0x0D) and line feed (0x0A) bytes into HTTP header values on both request and response sides due to insufficient validation in header parsing and serialization. Attackers can exploit this injection primitive to perform response splitting, cache poisoning, session fixation via Set-Cookie injection, security header override, and request smuggling against line-feed-tolerant backends.

CVSS v3
3.7
EG Score
3.7(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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 computed
Severity37% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

July 28, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

tiny-http 0.12.0 HTTP Response Splitting via Header Injection | Advisories | VulnCheck

https://www.vulncheck.com/advisories/tiny-http-http-response-splitting-via-header-injection
generic🟡 PoC Available

GitHub - theopaid/HTTP-Header-Injection-via-Unvalidated-CR-and-LF-in-Header-Values-tiny_http-: Security Advisory: HTTP Header Injection via Unvalidated CR and LF in Header Values (tiny_http) · GitHub

https://github.com/theopaid/HTTP-Header-Injection-via-Unvalidated-CR-and-LF-in-Header-Values-tiny_http-/tree/master

Vendor Advisories for CVE-2026-66753(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
rust-tiny-http0.12.0-1——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
rust-tiny-http0.12.0-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
rust-tiny-http0.12.0-1——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 51× 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.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 14:58 UTCEG score recompute
  3. 2026-08-24 14:58 UTCGHSA enrichment
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-21 08:03 UTCEG score recompute
  7. 2026-08-21 08:03 UTCGHSA enrichment
  8. 2026-08-20 22:56 UTCEPSS rescore
  9. 2026-08-19 17:04 UTCEPSS rescore
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 01:08 UTCEG score recompute
  12. 2026-08-18 01:07 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-15 01:30 UTCEPSS rescore
  16. 2026-08-14 17:12 UTCEG score recompute
  17. 2026-08-14 17:12 UTCGHSA enrichment
  18. 2026-08-13 22:00 UTCEPSS rescore
  19. 2026-08-12 23:52 UTCEG score recompute
  20. 2026-08-12 23:52 UTCGHSA enrichment
  21. 2026-08-12 13:51 UTCEPSS rescore
  22. 2026-08-11 00:00 UTCEPSS rescore
  23. 2026-08-09 16:58 UTCEG score recompute
  24. 2026-08-09 16:58 UTCGHSA enrichment
  25. 2026-08-09 13:47 UTCEPSS rescore
Show 26 more
  1. 2026-08-08 16:37 UTCEPSS rescore
  2. 2026-08-06 13:47 UTCEPSS rescore
  3. 2026-08-06 10:03 UTCEG score recompute
  4. 2026-08-06 10:03 UTCGHSA enrichment
  5. 2026-08-05 19:17 UTCEPSS rescore
  6. 2026-08-05 19:17 UTCEPSS rescore
  7. 2026-08-04 15:10 UTCEPSS rescore
  8. 2026-08-04 10:39 UTCEPSS rescore
  9. 2026-08-03 10:36 UTCEPSS rescore
  10. 2026-08-03 03:08 UTCEG score recompute
  11. 2026-08-03 03:08 UTCGHSA enrichment
  12. 2026-08-02 02:27 UTCEPSS rescore
  13. 2026-08-01 04:16 UTCEPSS rescore
  14. 2026-07-30 20:14 UTCEG score recompute
  15. 2026-07-30 20:13 UTCGHSA enrichment
  16. 2026-07-30 16:28 UTCEPSS rescore
  17. 2026-07-30 01:30 UTCEPSS rescore
  18. 2026-07-28 20:27 UTCEG score recompute
  19. 2026-07-28 20:26 UTCGHSA enrichment
  20. 2026-07-28 20:06 UTCEG score recompute
  21. 2026-07-28 20:06 UTCGHSA enrichment
  22. 2026-07-28 17:23 UTCEG score recompute▼ 1.60
  23. 2026-07-28 17:21 UTCNVD updateCVSS v3 → 3.7 · severity → LOW
  24. 2026-07-28 16:40 UTCEG score recompute
  25. 2026-07-28 16:14 UTCEG score recompute
  26. 2026-07-28 16:13 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-66753?
CVE-2026-66753 is a low vulnerability published on July 28, 2026. tiny-http through 0.12.0 contains an HTTP header injection vulnerability that allows attackers to inject carriage return (0x0D) and line feed (0x0A) bytes into HTTP header values on both request and response sides due to insufficient validation in header parsing and serialization. Attackers can…
When was CVE-2026-66753 disclosed?
CVE-2026-66753 was first published in the National Vulnerability Database on July 28, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66753 actively exploited?
CVE-2026-66753 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 88.0% of all scored CVEs.
What is the CVSS score of CVE-2026-66753?
CVE-2026-66753 has a CVSS v4.0 base score of 3.7 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-66753?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66753, 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

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