CVE-2026-66753

LOWPre-NVD 3.73.7—
EchelonGraph scoreMEDIUM 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: 0.3%CVSS: 3.7Exploit: Elevated riskExposed services: Not assessed

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

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
3.7LOWmedium confidence
EG Risk
33
EG Risk 33/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 28, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
🔬 Proof of concept available. No fix on record 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 rangeFix by version rangeDependents
rust-tiny-http0.12.0-1
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
rust-tiny-http0.12.0-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
rust-tiny-http0.12.0-1
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 34× 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.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-05 02:43 UTCEG score recompute
  7. 2026-10-05 02:43 UTCGHSA enrichment
  8. 2026-10-04 23:22 UTCEPSS rescore
  9. 2026-10-03 14:26 UTCEPSS rescore
  10. 2026-10-02 17:56 UTCEPSS rescore
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-10-01 10:18 UTCEG score recompute
  13. 2026-10-01 10:18 UTCGHSA enrichment
  14. 2026-09-30 15:03 UTCEPSS rescore
  15. 2026-09-28 13:52 UTCEPSS rescore
  16. 2026-09-28 03:23 UTCEG score recompute
  17. 2026-09-28 03:23 UTCGHSA enrichment
  18. 2026-09-27 13:48 UTCEPSS rescore
  19. 2026-09-26 15:59 UTCEPSS rescore
  20. 2026-09-23 17:54 UTCEPSS rescore
  21. 2026-09-22 21:41 UTCEG score recompute
  22. 2026-09-22 21:41 UTCGHSA enrichment
  23. 2026-09-20 20:16 UTCEPSS rescore
  24. 2026-09-18 19:28 UTCEPSS rescore
  25. 2026-09-18 02:06 UTCEG score recompute
Show 75 more
  1. 2026-09-18 02:06 UTCGHSA enrichment
  2. 2026-09-16 14:08 UTCEPSS rescore
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-14 10:46 UTCEG score recompute
  5. 2026-09-14 10:46 UTCGHSA enrichment
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 09:37 UTCEPSS rescore
  8. 2026-09-11 03:51 UTCEG score recompute
  9. 2026-09-11 03:51 UTCGHSA enrichment
  10. 2026-09-08 22:01 UTCEPSS rescore
  11. 2026-09-07 20:55 UTCEG score recompute
  12. 2026-09-07 20:55 UTCGHSA enrichment
  13. 2026-09-07 16:01 UTCEPSS rescore
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-05 15:31 UTCEPSS rescore
  16. 2026-09-04 12:01 UTCEG score recompute
  17. 2026-09-04 12:01 UTCGHSA enrichment
  18. 2026-09-04 05:07 UTCEPSS rescore
  19. 2026-09-02 14:12 UTCEPSS rescore
  20. 2026-09-01 13:54 UTCEPSS rescore
  21. 2026-08-31 04:48 UTCEG score recompute
  22. 2026-08-31 04:48 UTCGHSA enrichment
  23. 2026-08-30 19:17 UTCEPSS rescore
  24. 2026-08-30 01:22 UTCEPSS rescore
  25. 2026-08-28 21:42 UTCEPSS rescore
  26. 2026-08-27 21:53 UTCEG score recompute
  27. 2026-08-27 21:53 UTCGHSA enrichment
  28. 2026-08-26 14:47 UTCEPSS rescore
  29. 2026-08-25 13:49 UTCEPSS rescore
  30. 2026-08-24 14:58 UTCEG score recompute
  31. 2026-08-24 14:58 UTCGHSA enrichment
  32. 2026-08-23 00:19 UTCEPSS rescore
  33. 2026-08-21 23:49 UTCEPSS rescore
  34. 2026-08-21 08:03 UTCEG score recompute
  35. 2026-08-21 08:03 UTCGHSA enrichment
  36. 2026-08-20 22:56 UTCEPSS rescore
  37. 2026-08-19 17:04 UTCEPSS rescore
  38. 2026-08-18 13:48 UTCEPSS rescore
  39. 2026-08-18 01:08 UTCEG score recompute
  40. 2026-08-18 01:07 UTCGHSA enrichment
  41. 2026-08-17 13:47 UTCEPSS rescore
  42. 2026-08-16 14:56 UTCEPSS rescore
  43. 2026-08-15 01:30 UTCEPSS rescore
  44. 2026-08-14 17:12 UTCEG score recompute
  45. 2026-08-14 17:12 UTCGHSA enrichment
  46. 2026-08-13 22:00 UTCEPSS rescore
  47. 2026-08-12 23:52 UTCEG score recompute
  48. 2026-08-12 23:52 UTCGHSA enrichment
  49. 2026-08-12 13:51 UTCEPSS rescore
  50. 2026-08-11 00:00 UTCEPSS rescore
  51. 2026-08-09 16:58 UTCEG score recompute
  52. 2026-08-09 16:58 UTCGHSA enrichment
  53. 2026-08-09 13:47 UTCEPSS rescore
  54. 2026-08-08 16:37 UTCEPSS rescore
  55. 2026-08-06 13:47 UTCEPSS rescore
  56. 2026-08-06 10:03 UTCEG score recompute
  57. 2026-08-06 10:03 UTCGHSA enrichment
  58. 2026-08-05 19:17 UTCEPSS rescore
  59. 2026-08-05 19:17 UTCEPSS rescore
  60. 2026-08-04 15:10 UTCEPSS rescore
  61. 2026-08-04 10:39 UTCEPSS rescore
  62. 2026-08-03 10:36 UTCEPSS rescore
  63. 2026-08-03 03:08 UTCEG score recompute
  64. 2026-08-03 03:08 UTCGHSA enrichment
  65. 2026-08-02 02:27 UTCEPSS rescore
  66. 2026-08-01 04:16 UTCEPSS rescore
  67. 2026-07-30 20:14 UTCEG score recompute
  68. 2026-07-30 20:13 UTCGHSA enrichment
  69. 2026-07-30 16:28 UTCEPSS rescore
  70. 2026-07-30 01:30 UTCEPSS rescore
  71. 2026-07-28 20:27 UTCEG score recompute
  72. 2026-07-28 20:26 UTCGHSA enrichment
  73. 2026-07-28 20:06 UTCEG score recompute
  74. 2026-07-28 20:06 UTCGHSA enrichment
  75. 2026-07-28 17:23 UTCEG score recompute▼ 1.60

Related CVEs(same product + same CWE)

Same product

1 shown

Debian:12:rust-tiny-http

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 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 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66753?
CVE-2026-66753 has a CVSS base score of 3.7 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-66753?
No fix for CVE-2026-66753 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-66753 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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