Security readout for executives and security teams
Plain-English summary
CVE-2026-7598 is a critical integer overflow in libssh2 password authentication handling. A remote attacker can trigger integrity and availability impact according to the supplied CVSS data. The bundle names a patch commit, but does not provide evidence of active exploitation.
Executive priority
Treat this as urgent patch management for systems using affected libssh2 versions, especially exposed or business-critical platforms. No active exploitation is confirmed in the supplied sources.
Technical view
The issue affects libssh2 userauth_password in src/userauth.c, where username_len/password_len manipulation can cause integer overflow. The supplied affected list names libssh2 1.11.0 and 1.11.1. CVSS 3.1 is 9.1: network, low complexity, no privileges, no user interaction, high integrity and availability impact.
Likely exposure
Exposure is likely where applications, operating system packages, appliances, or containers include libssh2 1.11.0 or 1.11.1 and use password authentication flows.
Exploitation context
The bundle says the attack may be launched remotely and KEV is false. It provides no cited evidence of active exploitation, public exploit code, or observed attacks. Treat exploitation status as unconfirmed.
Researcher notes
The source bundle is sufficient for affected component, CVSS, and patch reference, but not for exploit maturity or detailed product impact. Validate downstream packaging because many products embed libssh2 indirectly.
Mitigation direction
- Upgrade libssh2 using vendor-supported fixed packages when available.
- Apply upstream patch commit 256d04b60d80bf1190e96b0ad1e91b2174d744b1 if building from source.
- Track Red Hat advisories RHSA-2026:7021 and RHSA-2026:16736 for affected Red Hat products.
- Prioritize internet-facing or high-trust systems that bundle libssh2.
- Review vendor guidance before applying compensating controls.
Validation and detection
- Inventory direct and transitive libssh2 dependencies across servers, containers, endpoints, and appliances.
- Confirm installed or bundled libssh2 versions are not 1.11.0 or 1.11.1.
- Check vendor advisories for package-level affected status and fixed builds.
- Verify source builds include commit 256d04b60d80bf1190e96b0ad1e91b2174d744b1 or later equivalent.
- Review authentication paths that call libssh2 password authentication.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-189: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-190: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-7598 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
5 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H3.95.2redhat-SADPAV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:OF/RC:C106.4VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C3.93.4VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C3.93.4VulDBCVSS: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——VulDBVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: 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:X
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C
Base CVSS 3.0 score
7.3HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C
Base CVSS 2.0 score
7.5HighVector: AV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:OF/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineVulDB
Advisory disclosed
- Source timelineVulDB
VulDB entry created
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineVulDB
VulDB entry last update
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-05-01T22:00:54.329Z: Reported to Red Hat.
- 2026-05-01T21:30:11.006Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- VDB-360555 | libssh2 userauth.c userauth_password integer overflowCVE reference, VulDB · vdb-entry, technical-description
- VDB-360555 | CTI Indicators (IOB, IOC, IOA)CVE reference, VulDB · signature, permissions-required
- Submit #805564 | libssh2 <= 1.11.1 Integer OverflowCVE reference, VulDB · third-party-advisory
- https://github.com/libssh2/libssh2/pull/1858CVE reference, VulDB · issue-tracking, patch
- https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1CVE reference, VulDB · patch
- https://github.com/libssh2/libssh2/CVE reference, VulDB · product
- https://access.redhat.com/security/cve/CVE-2026-7598CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2464597CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7598.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:7021CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:16736CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Numeric Errors
Numeric Errors represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.