Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-2968
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-23 04:16:02 UTC
Updated2026-04-29 01:00:01 UTC
DescriptionA vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts the function mg_chacha20_poly1305_decrypt of the file /src/tls_chacha20.c of the component Poly1305 Authentication Tag Handler. The manipulation results in improper verification of cryptographic signature. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is said to be difficult. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Risk And Classification

Primary CVSS: v4.0 2.9 LOW from [email protected]

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-345 | CWE-347 | CWE-347 Improper Verification of Cryptographic Signature | CWE-345 Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2.9LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/C...
4.0CNADECLARED6.3MEDIUMCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
3.1[email protected]Primary3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
3.0CNADECLARED3.7LOWCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
2.0[email protected]Secondary2.6AV:N/AC:H/Au:N/C:N/I:P/A:N
2.0CNADECLARED2.6AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cesanta Mongoose All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cesanta Mongoose affected 7.0 Not specified
CNA Cesanta Mongoose affected 7.1 Not specified
CNA Cesanta Mongoose affected 7.2 Not specified
CNA Cesanta Mongoose affected 7.3 Not specified
CNA Cesanta Mongoose affected 7.4 Not specified
CNA Cesanta Mongoose affected 7.5 Not specified
CNA Cesanta Mongoose affected 7.6 Not specified
CNA Cesanta Mongoose affected 7.7 Not specified
CNA Cesanta Mongoose affected 7.8 Not specified
CNA Cesanta Mongoose affected 7.9 Not specified
CNA Cesanta Mongoose affected 7.10 Not specified
CNA Cesanta Mongoose affected 7.11 Not specified
CNA Cesanta Mongoose affected 7.12 Not specified
CNA Cesanta Mongoose affected 7.13 Not specified
CNA Cesanta Mongoose affected 7.14 Not specified
CNA Cesanta Mongoose affected 7.15 Not specified
CNA Cesanta Mongoose affected 7.16 Not specified
CNA Cesanta Mongoose affected 7.17 Not specified
CNA Cesanta Mongoose affected 7.18 Not specified
CNA Cesanta Mongoose affected 7.19 Not specified
CNA Cesanta Mongoose affected 7.20 Not specified

References

ReferenceSourceLinkTags
github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md [email protected] github.com Exploit, Third Party Advisory
vuldb.com [email protected] vuldb.com Permissions Required, VDB Entry
vuldb.com [email protected] vuldb.com Third Party Advisory, VDB Entry
vuldb.com [email protected] vuldb.com Third Party Advisory, VDB Entry
github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md [email protected] github.com Exploit, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: dwbruijn (VulDB User) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-02-22T00:00:00.000ZAdvisory disclosed
CNA2026-02-22T01:00:00.000ZVulDB entry created
CNA2026-02-22T09:02:39.000ZVulDB entry last update
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