CVE-2026-67353

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 5.3 from GitHub Security Advisory published 2026-08-01. A secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

guzzlehttp/guzzle versions before 7.15.1 contain a denial of service vulnerability in the CookieJar that accepts unlimited Set-Cookie header fields with no size restrictions. Attackers can return many large cookies from a malicious server, causing Guzzle to store excessive data in memory and generate oversized Cookie headers that fail in handlers or destination servers.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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 (value × EchelonGraph’s weight)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
34th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 1, 2026

Last Modified

October 8, 2026

Advisory Details (2)

Auto-updated Aug 1, 2026
Patch available. Sources: github.
Web page

guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of Service | Advisories | VulnCheck

https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-unbounded-cookie-denial-of-service
GitHub advisoryMentions a patch (unverified)

Unbounded response cookies risk denial of service in guzzlehttp/guzzle · Advisory · guzzle/guzzle · GitHub

https://github.com/guzzle/guzzle/security/advisories/GHSA-f283-ghqc-fg79

Vendor Advisories for CVE-2026-67353(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
guzzle7.11.0-1 ... 8.2.0-1 (19 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
guzzle7.11.0-1 ... 8.2.0-1 (18 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
guzzle7.11.0-1 ... 7.9.2-0.1 (10 versions)
  • every version up to 7.15.1-1: fixed in 7.15.1-1
—
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
guzzlehttp/guzzle4.0.0 ... v3.8.1 (174 versions)
  • every version up to 7.15.1: fixed in 7.15.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 46× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 126 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 26 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  3. 2026-10-12 15:45 UTCEG score recompute
  4. 2026-10-11 19:30 UTCEG score recompute
  5. 2026-10-11 16:46 UTCEG score recompute
  6. 2026-10-11 14:07 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-10-08 16:38 UTCEG score recompute
  12. 2026-10-08 15:44 UTCEG score recompute
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  14. 2026-10-06 23:48 UTCEG score recompute
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-10-05 19:52 UTCEG score recompute
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  19. 2026-10-04 06:26 UTCEG score recompute
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  21. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  22. 2026-10-02 10:30 UTCEG score recompute
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  24. 2026-10-01 02:43 UTCEG score recompute
  25. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
Show 75 more
  1. 2026-09-29 06:47 UTCEG score recompute
  2. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  3. 2026-09-27 18:22 UTCEG score recompute
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  5. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  6. 2026-09-25 04:50 UTCEG score recompute
  7. 2026-09-24 03:06 UTCEG score recompute
  8. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  9. 2026-09-23 05:11 UTCEG score recompute
  10. 2026-09-22 07:11 UTCEG score recompute
  11. 2026-09-20 21:26 UTCEG score recompute
  12. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  13. 2026-09-19 23:31 UTCEG score recompute
  14. 2026-09-19 00:16 UTCEG score recompute
  15. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  16. 2026-09-18 02:22 UTCEG score recompute
  17. 2026-09-17 04:27 UTCEG score recompute
  18. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  19. 2026-09-16 06:30 UTCEG score recompute
  20. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  21. 2026-09-15 08:35 UTCEG score recompute
  22. 2026-09-14 10:40 UTCEG score recompute
  23. 2026-09-13 12:38 UTCEG score recompute
  24. 2026-09-11 16:44 UTCEG score recompute
  25. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  26. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  27. 2026-09-10 18:49 UTCEG score recompute
  28. 2026-09-09 19:45 UTCEG score recompute
  29. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  30. 2026-09-07 19:18 UTCEG score recompute
  31. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  33. 2026-09-06 06:34 UTCEG score recompute
  34. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  35. 2026-09-05 08:20 UTCEG score recompute
  36. 2026-09-04 10:25 UTCEG score recompute
  37. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  38. 2026-09-03 09:03 UTCEG score recompute
  39. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  40. 2026-09-01 22:25 UTCEG score recompute
  41. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  42. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  43. 2026-08-31 23:20 UTCEG score recompute
  44. 2026-08-30 20:08 UTCEG score recompute
  45. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  46. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  47. 2026-08-29 22:13 UTCEG score recompute
  48. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  49. 2026-08-26 15:29 UTCEG score recompute
  50. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  51. 2026-08-25 17:30 UTCEG score recompute
  52. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  53. 2026-08-24 19:20 UTCEG score recompute
  54. 2026-08-23 21:24 UTCEG score recompute
  55. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  56. 2026-08-22 01:34 UTCEG score recompute
  57. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  58. 2026-08-21 03:39 UTCEG score recompute
  59. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  60. 2026-08-20 05:45 UTCEG score recompute
  61. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  62. 2026-08-19 07:50 UTCEG score recompute
  63. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  64. 2026-08-18 09:53 UTCEG score recompute
  65. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  66. 2026-08-17 11:56 UTCEG score recompute
  67. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  68. 2026-08-16 14:02 UTCEG score recompute
  69. 2026-08-15 16:08 UTCEG score recompute
  70. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  71. 2026-08-14 18:13 UTCEG score recompute
  72. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  73. 2026-08-12 22:24 UTCEG score recompute
  74. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  75. 2026-08-12 00:29 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-67353?
CVE-2026-67353 is a medium-severity vulnerability; its CVE record was published on August 1, 2026. guzzlehttp/guzzle versions before 7.15.1 contain a denial of service vulnerability in the CookieJar that accepts unlimited Set-Cookie header fields with no size restrictions. Attackers can return many large cookies from a malicious server, causing Guzzle to store excessive data in memory and…
When was CVE-2026-67353 made public?
CVE-2026-67353 was made public on July 18, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 1, 2026. EchelonGraph's copy of the record carries a last-modified date of October 8, 2026; the record at its source may have been updated since.
Is CVE-2026-67353 actively exploited?
CVE-2026-67353 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-67353?
CVE-2026-67353 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-67353?
A fix for CVE-2026-67353 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-67353 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-67353

Explore →

Is Your Infrastructure Affected by CVE-2026-67353?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs