CVE-2026-55613

MEDIUMPre-NVD 6.96.9
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (34th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-114522 (ENISA EUVD)Source: ENISA EUVD

6.9EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.9Exploit: No code on recordExposed services: Not assessed

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

uhttpd is a small HTTP server. In unpatched repository snapshots, uh_ubus_data_send() in ubus.c can desynchronize HTTP request boundaries when a POST /ubus JSON body arrives in multiple TCP segments. An initial segment completing a JSON object sets du->jsobj; a later segment takes the existing-object parse-error path and returns zero bytes consumed. The caller neither drains the remaining declared Content-Length nor sets connection_close. An HTTP request embedded in the unread body suffix is consequently processed as a new request on the same keep-alive connection. The reported reproducer returned a JSON-RPC parse error followed by a second HTTP response. This application-layer body-handler flaw is distinct from Transfer-Encoding header case handling and chunk-length state reset, and affects deployments enabling ubus, including the default OpenWrt configuration and potential proxy/CDN deployments. Repository patches 7b1bec45826bd78c8afc993435bdc0f1df2fe399 and b2285de129b9adc8b12f84f9a27c16c21f2b57a5 address this issue.

CVSS
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
62
EG Risk 62/100

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)
Severity69% × 45%
Impact severity (EG Severity): CVSS 6.9 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: No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
34th
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 (6.9): severity, escalated by confirmed exploitation. This CVE's 6.9 is its impact severity (EG Severity), not escalated.

EG Severity
6.9 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-10). 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.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.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).

No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule 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.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

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

October 30, 2026

Last Modified

November 5, 2026

Advisory Details (3)

Auto-updated Oct 30, 2026
No fix on record yet. Sources: github, github_commit.
GitHub commit

commit b2285de129b9 (openwrt/uhttpd)

Fix landed in openwrt/uhttpd commit b2285de129b9 — awaiting tagged release

https://github.com/openwrt/uhttpd/commit/b2285de129b9adc8b12f84f9a27c16c21f2b57a5
GitHub commit

commit 7b1bec45826b (openwrt/uhttpd)

Fix landed in openwrt/uhttpd commit 7b1bec45826b — awaiting tagged release

https://github.com/openwrt/uhttpd/commit/7b1bec45826bd78c8afc993435bdc0f1df2fe399
GitHub advisoryMentions a patch (unverified)

HTTP request smuggling via ubus POST body parse-error desync · Advisory · openwrt/uhttpd · GitHub

https://github.com/openwrt/uhttpd/security/advisories/GHSA-wgwp-64hh-f52p

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 16× 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 → 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.

  1. 2026-11-13 16:53 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  2. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  3. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  4. 2026-11-11 07:51 UTCEchelonGraph re-scored
  5. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  6. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  7. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  8. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  9. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  10. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  11. 2026-11-05 03:26 UTCEchelonGraph re-scored
  12. 2026-11-05 03:04 UTCEchelonGraph re-scored
  13. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  14. 2026-11-04 01:57 UTCEchelonGraph re-scored
  15. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-11-02 19:47 UTCEchelonGraph re-scored
  17. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  19. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  20. 2026-10-30 23:02 UTCENISA EUVD ID recordedEUVD-2026-114522 · Source: ENISA EUVD
  21. 2026-10-30 22:26 UTCEchelonGraph re-scored
  22. 2026-10-30 22:06 UTCMITRE cvelistV5first tracked
  23. 2026-10-30 22:05 UTCEchelonGraph re-scoredFirst assessed: 6.9 MEDIUM

Frequently asked(5)

What is CVE-2026-55613?
CVE-2026-55613 is a medium-severity vulnerability; its CVE record was published on October 30, 2026. uhttpd is a small HTTP server. In unpatched repository snapshots, uh_ubus_data_send() in ubus.c can desynchronize HTTP request boundaries when a POST /ubus JSON body arrives in multiple TCP segments. An initial segment completing a JSON object sets du->jsobj; a later segment takes the…
When was the CVE record for CVE-2026-55613 published?
The CVE record for CVE-2026-55613 was published on October 30, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 5, 2026; the record at its source may have been updated since.
Is CVE-2026-55613 actively exploited?
CVE-2026-55613 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-2026-55613?
CVE-2026-55613 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55613?
No fix for CVE-2026-55613 is confirmed yet. Until one is published, restrict network exposure of the affected system — for example, keep it off the internet or limit it to trusted networks — and watch for a fix.

Dependency Blast Radius

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