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CVE-2026-3706mkj Dropbear S Range Check curve25519.c unpackneg signature verification

Description

A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the function unpackneg of the file src/curve25519.c of the component S Range Check. This manipulation causes improper verification of cryptographic signature. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is considered difficult. The actual existence of this vulnerability is currently in question. Patch name: fdec3c90a15447bd538641d85e5a3e3ac981011d. To fix this issue, it is recommended to deploy a patch. The project maintainer explains: "Signature Malleability is not exploitable in SSH protocol. (...) [A] PoC doesn't exist for SSH implementation, but rather it's against the internal API."

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.

Show the exploits1

References tagged exploit1 reference

Timeline

  1. ID reserved

    By VulDB

  2. · 1 day later

    Published

  3. · 45 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-3706, by who scored it
Scored byCVSSScoreVector
VulDBCNA (assigner)4.0Medium6.3CVSS: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:U
VulDBCNA (assigner)3.1Low3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C
VulDBCNA (assigner)3.0Low3.7CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C
VulDBCNA (assigner)2.0Low2.6AV:N/AC:H/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C
NVDNVD · Deferred4.0Low1.7CVSS: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:U/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
EPSS (exploitation in 30 days)
0.18% · top 92% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.

Affected products

  • mkj · Dropbear

    • affected 2025.0
    • affected 2025.1
    • affected 2025.2
    • affected 2025.3
    • affected 2025.4
    • affected 2025.5
    • affected 2025.6
    • affected 2025.7
    • affected 2025.8
    • affected 2025.9
    • affected 2025.10
    • affected 2025.11
    • affected 2025.12
    • affected 2025.13
    • affected 2025.14
    • affected 2025.15
    • affected 2025.16
    • affected 2025.17
    • affected 2025.18
    • affected 2025.19
    • affected 2025.20
    • affected 2025.21
    • affected 2025.22
    • affected 2025.23
    • affected 2025.24
    • affected 2025.25
    • affected 2025.26
    • affected 2025.27
    • affected 2025.28
    • affected 2025.29
    • affected 2025.30
    • affected 2025.31
    • affected 2025.32
    • affected 2025.33
    • affected 2025.34
    • affected 2025.35
    • affected 2025.36
    • affected 2025.37
    • affected 2025.38
    • affected 2025.39
    • and 50 more

References

References8

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .