CVE-2026-39087

mediumpriority · track · 0EPSS 0.003 · 19 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.27% (19th) EPSS

CVSS 6.4 · medium

Is it mine?

3 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · osv

EPSS · scored 2026-10-27

ntfy before 2.22.0 allows SSRF because of an unanchored regular expression for web push endpoint URLs.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.4–9.8

v3.16.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:Nsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9

v3.16.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:Nsecondary · cve@mitre.org USexploitability 3.1 · impact 2.7

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-777USprimaryCWE-94USCWE-94US

affected products (3)

Products and version ranges known to be affected.

ntfy ntfy0 → 2.22.0enisa_euvdEU
Go heckel.io/ntfyall versionsosvUSpkg:golang/heckel.io/ntfy
Go heckel.io/ntfy/v2< 2.22.0osvUSpkg:golang/heckel.io/ntfy/v2

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-pqhx-w72w-m393ntfy.sh allows a remote attacker to execute arbitrary code via the parseActions function2026-04-23ghsa · osvUS
An issue in Ntfy ntfy.sh before v.2.22.0 allows a remote attacker to execute arbitrary code via the parseActions function.
GO-2026-5551ntfy.sh allows a remote attacker to execute arbitrary code via the parseActions function in heckel.io/ntfy2026-06-25vendor · osvUS
ntfy.sh allows a remote attacker to execute arbitrary code via the parseActions function in heckel.io/ntfy

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv NVD CVE.org MITRE

published 2026-04-23modified 2026-07-04

related (5)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-40110US	high7.3	0.31% (24th)	—	2026-05-05
Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, the Origin header validation uses Python's re.match() to check incoming origins against…
CVE-2026-22068US	medium5.3	0.61% (49th)	—	2026-07-29
Regular Expression without Anchors vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 10.0.X through 10.1.3, from 9.0.X through 9.2.14. Users…
CVE-2026-97736US	—	0.21% (11th)	—	2026-09-25
tinyauth before 5.1.3 allows rule bypass by appending an allowed route string. This is caused by an unanchored regular expression.
CVE-2026-56021US	—	0.48% (41st)	—	2026-06-18
Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.
CVE-2024-1899US	—	0.81% (57th)	—	2024-02-26
An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.

references (8)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan