http.cookies.Morsel.js_output() returns an inline snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.
CVE-2026-6019
“—” beside the score: it is equal to NVD's CVSS score.
Score 6.1 from GitHub Security Advisory (severity: LOW) published 2026-04-22. NVD baseline CVSS 6.1; sources differ by 0.0.
Also known asEUVD-2026-25079 (ENISA EUVD) · GHSA-2755-2mm4-rm5c (GitHub Security Advisories)Source: ENISA EUVD
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 6.1
- EG Score
- 6.1MEDIUMmedium confidence
- EG Risk
- 28EG Risk 28/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity61% × 45%Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.2% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.Exploitation none (CISA Vulnrichment) · Automatable no (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. - EPSS PROB
- 0.2%
- EPSS %ILE
- 11th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.
- EG Severity
- 6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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
April 22, 2026
Last Modified
October 26, 2026
Advisory Details (6)
Auto-updated Jul 27, 2026Mailman 3 [CVE-2026-6019] BaseCookie.js_output() does not neutralize characters in cookie value embedded in JS - Security-announce - python.org
https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/gh-90309: Base64-encode cookie values embedded in JS
Fix merged in python/cpython PR #148848 on 2026-04-22 — awaiting tagged release
https://github.com/python/cpython/pull/148848SimpleCookie.js_output is vulnerable to HTML injection · Issue #90309 · python/cpython · GitHub
https://github.com/python/cpython/issues/90309commit f795e042043d (python/cpython)
Fix landed in python/cpython commit f795e042043d — awaiting tagged release
https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8commit 76b3923d688c (python/cpython)
Fix landed in python/cpython commit 76b3923d688c — awaiting tagged release
https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104commit 3c59b8b53fc7 (python/cpython)
Fix landed in python/cpython commit 3c59b8b53fc7 — awaiting tagged release
https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76cVendor Advisories for CVE-2026-6019(10)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:58420Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
- RHSA-2026:57660Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
- RHSA-2026:33885Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
- RHSA-2026:32997Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- RHSA-2026:32980Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
- RHSA-2026:28581Red Hat Product SecurityHigh
Red Hat Security Advisory: python3.14 security, bug fix, and enhancement update
- RHSA-2026:28247Red Hat Product SecurityHigh
Red Hat Security Advisory: python3.14 security, bug fix, and enhancement update
- RHSA-2026:22952Red Hat Product SecurityMedium
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- +2 more
Patch Availability(10)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | python3.12-venv (3.12.3-1ubuntu0.15) @ noble | 2026-10-29 | ubuntu |
| ubuntu | python3.5-venv (3.5.2-2ubuntu0~16.04.13+esm25) @ xenial | 2026-10-29 | ubuntu |
| redhat | python3-12-main-3.12.14-1.hum1 | 2026-08-21 | redhat |
| redhat | python3-11-main-3.11.16-1.hum1 | 2026-08-20 | redhat |
| redhat | python3-11-main-3.11.15-4.3.hum1 | 2026-06-30 | redhat |
| redhat | python3-12-main-3.12.13-3.2.hum1 | 2026-06-29 | redhat |
| redhat | python3-13-main-3.13.14-1.1.hum1 | 2026-06-29 | redhat |
| redhat | python3.14-0:3.14.5-1.el10_2 | 2026-06-24 | redhat |
| redhat | python3.14-0:3.14.5-1.el9_8 | 2026-06-23 | redhat |
| redhat | python3-14-main-3.14.5-2.hum1 | 2026-06-03 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(9 across 4 ecosystems)
Debian:14(3)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| pypy3 | 7.3.19+dfsg-2 ... 8.0.0+dfsg-1 (13 versions) |
| — |
| python3.13 | 3.13.11-1 ... 3.13.9-1 (7 versions) |
| — |
| python3.14 | 3.14.0-1 ... 3.14.4-2 (21 versions) |
| — |
Debian:11(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| pypy3 | 7.3.10+dfsg-1 ... 7.3.9+dfsg-5 (53 versions) |
| — |
| python3.9 | 3.9.10-1 ... 3.9.9-4 (29 versions) |
| — |
Debian:12(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| pypy3 | 7.3.11+dfsg-2 ... 8.0.0+dfsg-1 (31 versions) |
| — |
| python3.11 | 3.11.2-6 ... 3.11.2-6+deb12u8 (9 versions) |
| — |
Debian:13(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| pypy3 | 7.3.19+dfsg-2 ... 8.0.0+dfsg-1 (13 versions) |
| — |
| python3.13 | 3.13.5-2, 3.13.5-2+deb13u1 |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(2)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
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 98 of 246 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. 2 repeat rows among the latest 100 are merged into the row they repeat. The 148 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-29 16:56 UTCEG score recompute
- 2026-10-29 16:56 UTCVendor advisory
- 2026-10-29 16:56 UTCGHSA enrichmentGHSA-2755-2mm4-rm5c · GitHub severity LOW · GitHub CVSS 6.1
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-26 21:54 UTCEG score recompute
- 2026-10-26 21:54 UTCVendor advisory
- 2026-10-26 21:53 UTCGHSA enrichmentGHSA-2755-2mm4-rm5c · GitHub severity LOW · GitHub CVSS 6.1
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-25 14:15 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-22 20:54 UTCEG score recompute
- 2026-10-22 20:54 UTCVendor advisory
- 2026-10-22 20:54 UTCGHSA enrichmentGHSA-2755-2mm4-rm5c · GitHub severity LOW · GitHub CVSS 6.1
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
Show 73 moreShow fewer
- 2026-10-18 03:26 UTCEG score recompute
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-12 15:52 UTCEG score recompute
- 2026-10-11 19:35 UTCEG score recompute
- 2026-10-11 16:51 UTCEG score recompute
- 2026-10-11 14:13 UTCEG score recompute
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-10 17:25 UTCOSV refresh
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-09-21 04:49 UTCOSV refresh
- 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-02 02:38 UTCOSV refresh
- 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-08-16 05:56 UTCEG score recompute
- 2026-08-16 05:56 UTCVendor advisory
- 2026-08-16 05:56 UTCGHSA enrichmentGHSA-2755-2mm4-rm5c · GitHub severity LOW · GitHub CVSS 6.1
- 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-14 04:16 UTCEG score recompute
- 2026-08-14 04:16 UTCVendor advisory
- 2026-08-14 04:16 UTCGHSA enrichmentGHSA-2755-2mm4-rm5c · GitHub severity LOW · GitHub CVSS 6.1
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-12 18:27 UTCEG score recompute
- 2026-08-12 18:27 UTCVendor advisory
- 2026-08-12 18:27 UTCGHSA enrichmentGHSA-2755-2mm4-rm5c · GitHub severity LOW · GitHub CVSS 6.1
- 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-08-11 05:59 UTCEG score recompute
- 2026-08-11 05:59 UTCVendor advisory
- 2026-08-11 05:59 UTCGHSA enrichmentGHSA-2755-2mm4-rm5c · GitHub severity LOW · GitHub CVSS 6.1
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:14:python3.14
Same vendor
10 shownredhat:RHSA-2026:28247 · ubuntu:USN-8509-1 · redhat:RHSA-2026:57660
Frequently asked(5)
What is CVE-2026-6019?
When was the CVE record for CVE-2026-6019 published?
Is CVE-2026-6019 actively exploited?
What is the CVSS score of CVE-2026-6019?
How do I remediate CVE-2026-6019?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-6019
Is Your Infrastructure Affected by CVE-2026-6019?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.