CVE-2026-45809

HIGHPre-NVD 8.78.7
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (49th 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
8.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines 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: 0.6%CVSS: 8.7Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions prior to 3.6.6 and 4.0.0-rc1 contain a denial of service vulnerability in the watcherinfo generation functionality. An attacker can create an oversized watcher entry by sending a SUBSCRIBE Event: presence request with a long From URI, and then trigger presence.winfo watcherinfo XML generation for the same presentity. OpenSIPS copies the stored watcher URI into a fixed-size stack buffer, overflowing it and crashing the process. A remote attacker can crash an OpenSIPS worker in deployments that expose handle_subscribe() and allow watcherinfo (presence.winfo) generation. The issue is configuration-dependent because the presence and presence_xml modules must be loaded and SUBSCRIBE routing must be reachable. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
70
EG Risk 70/100

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)
Severity87% × 45%
The EG Score, 8.7 of 10.
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: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
49th
KEV
Not listed

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

The CVE record names the fixed release. 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.

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 4, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Aug 4, 2026
Fix named in the CVE record. Sources: github, github_commit.
GitHub commit

commit dd86461b71ff (OpenSIPS/opensips)

Fix landed in OpenSIPS/opensips commit dd86461b71ff — awaiting tagged release

https://github.com/OpenSIPS/opensips/commit/dd86461b71ff4a4f5194205896ae5f48f144240d
GitHub commit

commit c5970d3ee25b (OpenSIPS/opensips)

Fix landed in OpenSIPS/opensips commit c5970d3ee25b — awaiting tagged release

https://github.com/OpenSIPS/opensips/commit/c5970d3ee25b457ad2d78fe6e9662a12dae577cd
GitHub advisoryMentions a patch (unverified)

denial of service in watcherinfo XML generation from oversized watcher URI · Advisory · OpenSIPS/opensips · GitHub

https://github.com/OpenSIPS/opensips/security/advisories/GHSA-gx83-2gh8-7v56

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 44× 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 120 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 20 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
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  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.6% · 49th percentile
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  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
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  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 48th percentile
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  1. 2026-09-27 17:56 UTCEG score recompute
  2. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  3. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  4. 2026-09-25 04:39 UTCEG score recompute
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  6. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  7. 2026-09-22 15:09 UTCEG score recompute
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  10. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  21. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  22. 2026-09-13 02:56 UTCEG score recompute
  23. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  25. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  26. 2026-09-11 14:46 UTCEG score recompute
  27. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  29. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  58. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  75. 2026-08-14 04:43 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-45809?
CVE-2026-45809 is a high-severity vulnerability; its CVE record was published on August 4, 2026. OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions prior to 3.6.6 and 4.0.0-rc1 contain a denial of service vulnerability in the watcherinfo generation functionality. An attacker can create an oversized watcher entry by sending a SUBSCRIBE Event: presence request with a…
When was the CVE record for CVE-2026-45809 published?
The CVE record for CVE-2026-45809 was published on August 4, 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 September 8, 2026; the record at its source may have been updated since.
Is CVE-2026-45809 actively exploited?
CVE-2026-45809 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45809?
CVE-2026-45809 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-45809?
The CVE record for CVE-2026-45809 names the fix: "This issue has been fixed in versions 3.6.6 and 4.0.0-rc1."

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