CVE-2026-7598: libssh2 Numeric Errors
CVSS: 7.5v2.0HighModified
AliasesALPINE-CVE-2026-7598RHSA-2026:16736RHSA-2026:7021UBUNTU-CVE-2026-7598DEBIAN-CVE-2026-7598CGA-2q7f-465j-xvwrCGA-qg48-4m4h-9j77CGA-rv5g-x2h9-xfc9CGA-v5pj-37fv-q6qmCGA-vfwc-xjvj-f3ffCGA-x7pv-36qh-v8mg
Published 01-05-2026Last modified 01-09-2026
Vulnerability summary
CVE-2026-7598 is a high (CVSS 7.5) Numeric Errors vulnerability in libssh2. EPSS estimates a 0.82% chance of exploitation in the next 30 days, higher than 56.6% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v2.0 (CVE.org)EPSS score
0.82%
0%100%
Low · +0.36 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 13 · Related 13Timeline
- 01-05-2026PublishedVulnerability first disclosed.
- 01-09-2026Last modifiedVulnerability information updated.
Description
A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
CVSS metrics
14 scores · 8 sources · 4 versionsMedium 6.9Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:XSourcesAll 7 agree
- OSV · AlpineEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/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
- OSV · UbuntuEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- OSV · DebianEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/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
- OSV · WolfiEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
- OSV · ChainguardEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
- NVDNIST6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/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
High 7.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:CSources4 sources · 7.3–9.1
- OSV · Red hatEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HDiffers
- NVDNIST7.3HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
High 7.3Preferred score · CVE.org (CNA)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:CSourcesSingle source
High 7.5Preferred score · CVE.org (CNA)
AV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:OF/RC:CSourcesAll 2 agree
- NVDNIST7.5HighAV:N/AC:L/Au:N/C:P/I:P/A:P
EPSS trend
Probability
0.82%
Chance of exploitation in the next 30 days
Percentile
57%
Versus all other CVEs
30-day change
+0.36 pp
From 0.47% on 19-09-2026
19-09-202619-10-2026
EPSS score0.82%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-189Numeric ErrorsWeaknesses in this category are related to improper calculation or conversion of numbers.
- CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
Affected systems
Redhat20 products
- libssh2< 0:1.11.1-5.1.hum1
- libssh2-devel< 0:1.11.1-5.1.hum1
- libssh2-docs< 0:1.11.1-5.1.hum1
- rust< 0:1.95.0-5.hum1
- rust-analyzer< 0:1.95.0-5.hum1
Chainguard3 products
- libssh2< 1.11.1-r5
- libssh2-dev< 1.11.1-r5
- libssh2-doc< 1.11.1-r5
Wolfi3 products
- libssh2< 1.11.1-r5
- libssh2-dev< 1.11.1-r5
- libssh2-doc< 1.11.1-r5
Alpine1 product
- libssh2< 1.11.0-r3 | < 1.11.1-r1 | < 1.11.1-r2
Debian1 product
- libssh2< 1.10.0-3+deb12u1 | < 1.11.1-1+deb13u1 | < 1.11.1-3
Libssh21 product
- libssh2≤ 1.11.1
Ubuntu1 product
- libssh2All versions (No fix recorded) | < 1.11.0-4.1ubuntu0.24.04.1 | < 1.11.1-1ubuntu0.25.10.1 | < 1.11.1-1ubuntu0.26.04.1
7 vendors · 30 products
References
23 linksShow all 23 references
- images.redhat.comARTICLE
