CVE-2026-106803

CRITICALPre-NVD 9.89.8
EchelonGraph scoreHIGH confidence

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

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-11-02. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Elevated

Also known asEUVD-2026-115344 (ENISA EUVD) · GHSA-g9r9-79hc-j698 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan mitigationThe upstream fix is not in a release yet: until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it (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: 0.5%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_registrar_pcscf module. When processing a crafted application/reginfo+xml NOTIFY message, process_contact() copies an attacker-controlled port value from the alias parameter into a fixed 5-byte stack buffer without validating its length. An unauthenticated remote attacker can trigger stack corruption and terminate the P-CSCF process, resulting in denial of service.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
75
EG Risk 75/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 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, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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: An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it.
EPSS PROB
0.5%
EPSS %ILE
43rd
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% 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, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 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, Track* at medium and Attend at high mission impact.

An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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)3 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 total (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

November 2, 2026

Last Modified

November 3, 2026

Advisory Details (4)

Auto-updated Nov 7, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
Web page

ims_registrar_pcscf: unbounded `memcpy` of the `alias=` Port Field in `process_contact()` Overflows a 5-Byte Stack Buffer · Issue #4954 · kamailio/kamailio · GitHub

https://github.com/kamailio/kamailio/issues/4954
GitHub pull request

ims_registrar_pcscf: check for port size in alias param

Fix merged in kamailio/kamailio PR #4958 on 2026-09-24 — awaiting tagged release

https://github.com/kamailio/kamailio/pull/4958
GitHub commit

commit 21261436492f (kamailio/kamailio)

Fix landed in kamailio/kamailio commit 21261436492f — awaiting tagged release

https://github.com/kamailio/kamailio/commit/21261436492f0014930e804e20586e3833bb91b9

Vendor Advisories for CVE-2026-106803(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 29× 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.

  1. 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-11-13 10:41 UTCEchelonGraph re-scored
  3. 2026-11-13 10:41 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-11-12 11:01 UTCEchelonGraph re-scored
  6. 2026-11-12 11:01 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-11-11 16:37 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-11-11 11:24 UTCEchelonGraph re-scored
  9. 2026-11-11 11:24 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-11-10 16:41 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-11-10 11:47 UTCEchelonGraph re-scored
  12. 2026-11-10 11:47 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-11-09 12:10 UTCEchelonGraph re-scored
  15. 2026-11-09 12:10 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-11-08 12:33 UTCEchelonGraph re-scored
  18. 2026-11-08 12:33 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-11-07 12:55 UTCEchelonGraph re-scored
  21. 2026-11-07 12:55 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-11-06 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-11-06 13:19 UTCEchelonGraph re-scored
  24. 2026-11-06 13:19 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-11-05 22:25 UTCOSV refresh
Show 17 more
  1. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-11-05 13:43 UTCEchelonGraph re-scored
  3. 2026-11-05 13:43 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-11-04 14:07 UTCEchelonGraph re-scored
  6. 2026-11-04 14:07 UTCGHSA enrichmentGHSA-g9r9-79hc-j698 · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-11-03 16:46 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-11-03 14:29 UTCEchelonGraph re-scored
  9. 2026-11-03 14:29 UTCGHSA enrichmentGHSA-g9r9-79hc-j698
  10. 2026-11-03 13:43 UTCEchelonGraph re-scoredFirst assessed: 9.8 CRITICAL
  11. 2026-11-03 13:43 UTCGHSA enrichmentGHSA-g9r9-79hc-j698
  12. 2026-11-03 13:41 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  13. 2026-11-02 19:48 UTCGHSA enrichmentGHSA-g9r9-79hc-j698
  14. 2026-11-02 18:03 UTCENISA EUVD ID recordedEUVD-2026-115344 · Source: ENISA EUVD
  15. 2026-11-02 17:26 UTCNVD update
  16. 2026-11-02 17:18 UTCEchelonGraph re-scored
  17. 2026-11-02 17:17 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-106803?
CVE-2026-106803 is a critical-severity vulnerability; its CVE record was published on November 2, 2026. A stack-based buffer overflow exists in Kamailio v6.1.3 and v6.1.4 in the ims_registrar_pcscf module. When processing a crafted application/reginfo+xml NOTIFY message, process_contact() copies an attacker-controlled port value from the alias parameter into a fixed 5-byte stack buffer without…
When was the CVE record for CVE-2026-106803 published?
The CVE record for CVE-2026-106803 was published on November 2, 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 3, 2026; the record at its source may have been updated since.
Is CVE-2026-106803 actively exploited?
CVE-2026-106803 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-106803?
CVE-2026-106803 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-106803?
An upstream fix for CVE-2026-106803 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-106803 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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