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3192 articles · 168085 vulns · 37/41 feeds (7d)
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7.3
CVE-2026-7598EXPLOITEDPATCHED
libssh2 · libssh2

libssh2 userauth.c userauth_password integer overflow

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.

Affected Products

VendorProductVersions
libssh2libssh21.11.0, 1.11.1

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
open sourceopen source libssh2cert_advisory90%

References

  • https://vuldb.com/vuln/360555(vdb-entry, technical-description)
  • https://vuldb.com/vuln/360555/cti(signature, permissions-required)
  • https://vuldb.com/submit/805564(third-party-advisory)
  • https://github.com/libssh2/libssh2/pull/1858(issue-tracking, patch)
  • https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1(patch)
  • https://github.com/libssh2/libssh2/(product)

Related News (3 articles)

Tier B
BSI Advisories54d ago
[NEU] [mittel] libssh2: Schwachstelle ermöglicht Denial of Service
→ No new info (linked only)
Tier A
Microsoft MSRC55d ago
CVE-2026-7598 libssh2 userauth.c userauth_password integer overflow
→ No new info (linked only)
Tier C
VulDB57d ago
CVE-2026-7598 | libssh2 up to 1.11.1 src/userauth.c userauth_password username_len/password_len integer overflow (ID 1858)
→ No new info (linked only)
CVSS 3.17.3 NONE
CISA KEV❌ No
Actively exploited✅ Yes
Patch available
https://github.com/libssh2/libssh2/pull/1858https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1
CWECWE-190, CWE-189
PublishedMay 1, 2026
Last enriched54d agov2
Trending Score0
Source articles3
Independent3
Info Completeness9/14
Missing: vendor, epss, kev, iocs, mitre_attack

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Related CVEs (5)

NONECVE-2026-55200EXP
libssh2 - Out-of-Bounds Write via Unchecked packet_length in transport.c
Trending: 73
CRITICALCVE-2026-55199EXP
libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler
Trending: 42
CRITICALCVE-2025-15661EXP
libssh2 - Heap Buffer Over-read via sftp_symlink() in sftp.c
Trending: 40
MEDIUMCVE-2026-58051
libssh2 - Free of Uninitialized Pointer in publickey List Cleanup
HIGHCVE-2026-58050
libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation

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Verification

State: unverified
Confidence: 0%

Vulnerability Timeline

CVE Published
May 1, 2026
Discovered by ZDM
May 1, 2026
Updated: description, exploitAvailable, activelyExploited
May 4, 2026
Actively Exploited
May 4, 2026
Exploit Available
May 4, 2026
Patch Available
May 4, 2026

Version History

v2
Last enriched 54d ago
v2Tier B54d ago

Updated description to include Denial of Service attack capability and marked the vulnerability as actively exploited.

descriptionexploitAvailableactivelyExploited
via BSI Advisories
v157d ago

Initial creation