fflate through 0.8.2 is vulnerable to denial of service via an infinite loop in unzipSync(). A crafted ZIP archive with a central directory entry declaring compressed_size=0xFFFFFFFF (ZIP64 sentinel) but missing the required ZIP64 extra field tag 0x0001 causes z64e() to loop indefinitely due to out-of-bounds reads returning undefined, which coerces to 0, keeping the loop condition permanently true.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:87004 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):

    * automation-gateway: authorization bypass via workload identity token forgery (CVE-2026-94416)
    * automation-platform-ui: proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet     (CVE-2026-90711)
    * automation-platform-ui: compression: Denial of Service via memory leak on premature response close     (CVE-2026-87776)
    * automation-platform-ui: fflate: Denial of Service via crafted ZIP archives (CVE-2026-45820)
    * python3.12-pulpcore: file:// scheme allowlist bypass in content upload file_url field enables arbitrary     file read and Pulp Container registry signing key theft (CVE-2026-90959)
    * python3.12-pyjwt: Verification key substitution via unvalidated JWKS redirects (CVE-2026-102267)
    * python3.12-pyjwt: Token forgery via improper Unicode byte-order mark handling (CVE-2026-102272)
    * python3.12-pyjwt: Authentication bypass via empty HMAC key acceptance (CVE-2026-102266)
    * python3.12-pyjwt: Authentication bypass via acceptance of DER public keys as HMAC secrets     (CVE-2026-102271)
    * python3.12-pyjwt: Token forgery via acceptance of public JWK containers as HMAC secrets     (CVE-2026-102273)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    For details about this release, refer to the release notes listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - fflate through 0.8.2 is vulnerable to denial of service via an infinite loop in unzipSync(). A crafted ZIP
    archive with a central directory entry declaring compressed_size=0xFFFFFFFF (ZIP64 sentinel) but missing
    the required ZIP64 extra field tag 0x0001 causes z64e() to loop indefinitely due to out-of-bounds reads
    returning undefined, which coerces to 0, keeping the loop condition permanently true. (CVE-2026-45820)

ID	Name	Product	Family	Type	Severity
370142	RHEL 9 : Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update (Important) (RHSA-2026:87004)	Nessus	Red Hat Local Security Checks	Local	high
463561	Echo: fflate: security update to 0.4.9	Tenable Cloud Security	Echo Local Security Checks	Local	high
463561	Echo: fflate: security update to 0.4.9	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high

Detections

Analytics

CVE-2026-45820

high

Tenable Plugins

high

high

high