An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service against a curl or libcurl client. Because the helper function discards zero-length UDP datagrams before counting them toward the per-call packet budget, a connected QUIC peer can continuously stream empty datagrams to indefinitely stall the client.
CVE-2026-11352
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.
Also known asEUVD-2026-41498 (ENISA EUVD) · GHSA-qxwx-hr5v-h5q4 (GitHub Security Advisories)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 65EG Risk 65/100
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)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.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 public PoC (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
- 1.0%
- EPSS %ILE
- 63rd
- 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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 1.0% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). 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 low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days 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 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 public PoC (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.
The score's inputs: 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
July 3, 2026
Last Modified
September 15, 2026
Advisory Details (3)
Auto-updated Jul 7, 2026curl - QUIC zero-length UDP datagrams busy-loop - CVE-2026-11352
https://curl.se/docs/CVE-2026-11352.htmlVendor Advisories for CVE-2026-11352(4)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- CVE-2026-11352Microsoft Security Response Center (MSRC)HighMicrosoft CVSS 7.5
Microsoft advisory for CVE-2026-11352
- GHSA-qxwx-hr5v-h5q4GitHub Security AdvisoriesHigh
An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote...
- RHSA-2026:34975Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- RHSA-2026:29017Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Patch Availability(3)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | libcurl4t64 (8.14.1-2ubuntu1.5) @ questing | 2026-10-24 | ubuntu |
| redhat | rust-main-1.96.1-1.hum1 | 2026-07-02 | redhat |
| redhat | curl-main-8.21.0-0.1.hum1 | 2026-06-24 | 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
(3 across 3 ecosystems)
Alpine:v3.23(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| curl | — |
| — |
Alpine:v3.24(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| curl | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| curl | 8.14.1-2 ... 8.21.0~rc1-1+exp1 (59 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(1)
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 9× in last 7d / 38× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.
Showing the most recent 100 of 368 rows 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 268 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-13 06:27 UTCEchelonGraph re-scored
- 2026-11-13 06:27 UTCVendor advisory
- 2026-11-13 06:27 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-12 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-11 16:38 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-10 16:42 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-09 16:34 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-08 16:38 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-07 16:38 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-06 16:36 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-06 15:37 UTCEchelonGraph re-scored
- 2026-11-06 15:37 UTCVendor advisory
- 2026-11-06 15:37 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-05 16:36 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-04 16:34 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-03 16:46 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-11-02 16:44 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-31 00:47 UTCEchelonGraph re-scored
- 2026-10-31 00:47 UTCVendor advisory
- 2026-10-31 00:47 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-30 16:33 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 1.0% · 63rd percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
Show 75 moreShow fewer
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-25 14:51 UTCEchelonGraph re-scored
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-24 09:58 UTCEchelonGraph re-scored
- 2026-10-24 09:58 UTCVendor advisory
- 2026-10-24 09:58 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-18 05:05 UTCEchelonGraph re-scored
- 2026-10-17 19:08 UTCEchelonGraph re-scored
- 2026-10-17 19:08 UTCVendor advisory
- 2026-10-17 19:08 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-13 14:24 UTCOSV refresh
- 2026-10-12 16:37 UTCEchelonGraph re-scored
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-11 20:13 UTCEchelonGraph re-scored
- 2026-10-11 18:25 UTCEchelonGraph re-scored
- 2026-10-11 14:59 UTCEchelonGraph re-scored
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-23 06:36 UTCEchelonGraph re-scored
- 2026-09-23 06:36 UTCVendor advisory
- 2026-09-23 06:36 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-09-18 06:13 UTCEchelonGraph re-scored
- 2026-09-18 06:13 UTCVendor advisory
- 2026-09-18 06:13 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-15 07:26 UTCVendor advisory
- 2026-09-15 07:26 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-15 06:39 UTCEchelonGraph re-scored
- 2026-09-15 06:39 UTCVendor advisory
- 2026-09-15 06:39 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-14 00:05 UTCEchelonGraph re-scored
- 2026-09-14 00:05 UTCVendor advisory
- 2026-09-14 00:05 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-13 08:58 UTCEchelonGraph re-scored
- 2026-09-13 08:58 UTCVendor advisory
- 2026-09-13 08:58 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-12 14:06 UTCEchelonGraph re-scored
- 2026-09-12 14:06 UTCVendor advisory
- 2026-09-12 14:06 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-06 14:18 UTCEchelonGraph re-scored
- 2026-09-06 14:18 UTCVendor advisory
- 2026-09-06 14:18 UTCGHSA enrichmentGHSA-qxwx-hr5v-h5q4 · GitHub severity HIGH · GitHub CVSS 7.5
Related CVEs(same product + same vendor + same CWE)· as of November 12, 2026
Same product
10 shownAlpine:v3.23:curl
- CVE-2026-19931EG 9.8CRITICAL
- CVE-2026-9079EG 9.8CRITICAL
- CVE-2026-8925EG 9.8CRITICAL
- CVE-2026-11856EG 9.8CRITICAL
- CVE-2026-10536EG 9.8CRITICAL
- CVE-2025-0665NVD 7.0EG 9.8CRITICAL
- CVE-2023-38545NVD 8.8EG 9.8EPSS p100CRITICAL
- CVE-2023-27536NVD 5.9EG 9.8CRITICAL
- CVE-2022-32221EG 9.8EPSS p92CRITICAL
- CVE-2022-42915NVD 8.1EG 9.8EPSS p90CRITICAL
Same vendor
10 shownredhat:RHSA-2026:29017
Frequently asked(5)
What is CVE-2026-11352?
When was the CVE record for CVE-2026-11352 published?
Is CVE-2026-11352 actively exploited?
What is the CVSS score of CVE-2026-11352?
How do I remediate CVE-2026-11352?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-11352
Is Your Infrastructure Affected by CVE-2026-11352?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.